1. |
Darban H., Luciano R.^{♦}, Basista M., Free transverse vibrations of nanobeams with multiple cracks,
International Journal of Engineering Science, ISSN: 0020-7225, DOI: 10.1016/j.ijengsci.2022.103703, Vol.177, pp.103703-1-20, 2022Streszczenie: A nonlocal model is formulated to study the size-dependent free transverse vibrations of nanobeams with arbitrary numbers of cracks. The effect of the crack is modeled by introducing discontinuities in the slope and transverse displacement at the cracked cross-section, proportional to the bending moment and the shear force transmitted through it. The local compliance of each crack is related to its stress intensity factors assuming that the crack tip stress field is undisturbed (non-interacting cracks).The kinematic field is defined based on the Bernoulli-Euler beam theory, and the small-scale size effect is taken into account by employing the constitutive equation of the stress-driven nonlocal theory of elasticity. In this manner, the curvature at each cross-section is defined as an integral convolution in terms of the bending moments at all the cross-sections and a kernel function which depends on a material characteristic length parameter. The integral form of the nonlocal constitutive equation is elaborated and converted into a differential equation subjected to a set of mathematically consistent boundary and continuity conditions at the nanobeam’s ends and the cracked cross-sections. The equation of motion in each segment of the nanobeam between cracks is solved separately and the variationally consistent and constitutive boundary and continuity conditions are imposed to determine the natural frequencies. The model is applied to nanobeams with different boundary conditions and the natural frequencies and the mode shapes are presented at the presence of one to four cracks. The results of the model converge to the experimental results available in the literature for the local cracked beams and to the solutions of the intact nanobeams when the crack length goes to zero. The effects of the crack location, crack length, and nonlocality on the natural frequencies are investigated, also for the higher modes of vibrations. Novel findings including the amplification and shielding effects of the cracks on the natural frequencies are presented and discussed. Słowa kluczowe: cracked nanobeam, transverse vibration, nonlocal elasticity, size effect Afiliacje autorów:
Darban H. | - | IPPT PAN | Luciano R. | - | Università degli Studi di Napoli "Parthenope" (IT) | Basista M. | - | IPPT PAN |
| | 200p. |
2. |
Darban H., Bochenek K., Węglewski W., Basista M., Experimental Determination of the Length-Scale Parameter for the Phase-Field Modeling of Macroscale Fracture in Cr–Al2O3 Composites Fabricated by Powder Metallurgy,
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-022-06677-3, pp.1-23, 2022Streszczenie: A novel approach is proposed to determine a physically meaningful length-scale parameter for the phase-field modeling of macroscale fracture in metal–ceramic composites on an example of chromium–alumina composite fabricated by powder metallurgy. The approach is based on the fractography analysis by the scanning electron microscopy (SEM) with the aim to measure the process zone size and use that value as the length-scale parameter in the phase-field modeling. Mode I and mixed-mode I/II fracture tests are conducted on Cr–Al2O3 composites at different reinforcement volume fractions and particle sizes using single-edge notched beams under four-point bending. The fracture surfaces are analyzed in detail by SEM to determine the size of the process zone where the microscale nonlinear fracture events occur. The model adequately approximates the experimentally measured fracture toughness and the fracture loads. It is shown that the model prediction of the crack initiation direction under the mixed-mode loading is in agreement with the experiments and the generalized maximum tangential stress criterion. These outcomes justify using the process zone size as the scale parameter in the phase-field modeling of macroscale fracture in chromium–alumina and similar metal–ceramic composites. Afiliacje autorów:
Darban H. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 200p. |
3. |
Węglewski W., Pitchai P.^{♦}, Chmielewski M.^{♦}, Guruprasad P.J.^{♦}, Basista M., Thermal conductivity of Cu-matrix composites reinforced with coated SiC particles: Numerical modeling and experimental verification,
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISSN: 0017-9310, DOI: 10.1016/j.ijheatmasstransfer.2022.122633, Vol.188, pp.122633-1-18, 2022Streszczenie: Copper-matrix composites reinforced with silicon carbide (SiC) particles are heat sink materials with potential application in the electronic industry. A major challenge in the manufacturing of these materials, involving sintering process, is to prevent the decomposition of SiC and the subsequent dissolution of silicon in the copper matrix. This is overcome by coating SiC particles with metallic layers. In this study, a combined experimental and computational micromechanics approach was used to investigate thermal conductivity of Cu-matrix composites reinforced with silicon carbide particles coated with chromium, titanium, or tungsten layers. Plasma Vapor Deposition (PVD) was used to produce the metallic layers on SiC particles, while Spark Plasma Sintering (SPS) to consolidate the powder mixtures of copper and coated silicon carbide. Thermal conductivities of the fabricated three-phase composites Cu/SiC/Cr, Cu/SiC/Ti and Cu/SiC/W were evaluated using the Laser Flash technique. Finite Element Method (FEM) and Variational Asymptotic Method (VAM) based homogenization techniques were used for computational modeling of thermal conductivity. In the numerical models complex material microstructures were accounted for using micro-CT images of the sintered compacts. Comparison of the experimental results with simulations highlighted the importance of including the effect of imperfect interfaces to accurately model thermal conductivity of the investigated composites. Słowa kluczowe: metal-matrix composites, powder metallurgy, plasma vapor deposition, imperfect interface, thermal conductivity, numerical modeling Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Pitchai P. | - | Indian Institute of Science (IN) | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Guruprasad P.J. | - | Indian Institute of Technology (IN) | Basista M. | - | IPPT PAN |
| | 200p. |
4. |
Darban H., Luciano R.^{♦}, Caporale A.^{♦}, Basista M., Modeling of buckling of nanobeams embedded in elastic medium by local-nonlocal stress-driven gradient elasticity theory,
COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2022.115907, Vol.297, pp.115907-1-11, 2022Streszczenie: A novel buckling model is formulated for the Bernoulli-Euler nanobeam resting on the Pasternak elastic foundation. The formulation is based on the local-nonlocal stress-driven gradient elasticity theory. In order to incorporate the size-dependency, the strain at each point is defined as the integral convolutions in terms of the stresses and their first-order gradients in all the points, accounting also for the local contribution. The differential form of the nonlocal constitutive equation, together with a set of constitutive boundary conditions, are used to define the buckling equation in terms of transverse displacement, which is solved in closed form. Both variationally consistent and the constitutive boundary conditions are imposed to calculate the buckling loads and the corresponding mode shapes. The predictions of the present model are in agreement with the results available in the literature for the carbon nanotubes based on the molecular dynamics simulations. Insightful results are presented for the first three buckling modes of local-nonlocal nanobeams considering the gradient effects. The distinctive feature of the present model is its capability to capture both stiffening and softening behaviors at the small-scales, which result in, respectively, higher and lower buckling loads of the nanobeams with respect to those of the large-scale beams. Słowa kluczowe: nanobeams, nonlocal elasticity, stress gradient, buckling, Pasternak foundation Afiliacje autorów:
Darban H. | - | IPPT PAN | Luciano R. | - | Università degli Studi di Napoli "Parthenope" (IT) | Caporale A. | - | University of Cassino and Southern Lazio (IT) | Basista M. | - | IPPT PAN |
| | 140p. |
5. |
Bochenek K., Węglewski W., Strojny-Nędza A.^{♦}, Pietrzak K., Chmielewski T.^{♦}, Chmielewski M.^{♦}, Basista M., Microstructure, Mechanical, and Wear Properties of NiCr-Re-Al2O3 Coatings Deposited by HVOF, Atmospheric Plasma Spraying, and Laser Cladding,
Journal of Thermal Spray Technology, ISSN: 1059-9630, DOI: 10.1007/s11666-022-01400-5, pp.1-25, 2022Streszczenie: Metallic coatings are often applied on steel tubes in power generation boilers to improve their performance and extend the lifetime. Besides the high-temperature corrosion and erosion protection, the coatings should manifest good adhesion and cohesion strength, and relatively low residual stresses. In this study, three processing techniques: high velocity oxygen fuel spraying (HVOF), atmospheric plasma spraying (APS), and direct laser cladding were employed to obtain novel NiCr-Re and NiCr-Re-Al2O3 coatings intended for application in combustion boilers. The main objective was to assess the suitability of these three techniques to deposit NiCr-Re and NiCr-Re-Al2O3 composite coatings on a 16Mo3 steel substrate. For this purpose, a comparative analysis of the coatings behavior in selected tests was conducted. Of the three processing techniques, thermal spraying by HVOF turned out to be the optimum choice for the studied coatings. From among several variants of the HVOF-sprayed coatings, namely NiCr+1%Re, NiCr+2%Re, NiCr+1%Re+5%Al2O3, and NiCr+1%Re+10%Al2O3 (all vol.%), the NiCr+1%Re material exhibited the lowest extent of cracking in the disk bend test, the highest tensile strength (405 MPa) in the in-plane tension test, the highest Vickers hardness (379 HV2), the lowest specific wear rate (2.23·10-4 mm3/N m), and the lowest level of average residual tensile stress (120 MPa). Słowa kluczowe: alumina, HVOF, mechanical behavior, nickel-chromium coatings, rhenium, residual stress, wear resistance Afiliacje autorów:
Bochenek K. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Strojny-Nędza A. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | IPPT PAN | Chmielewski T. | - | Warsaw University of Technology (PL) | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Basista M. | - | IPPT PAN |
| | 140p. |
6. |
Darban H., Luciano R.^{♦}, Basista M., Calibration of the length scale parameter for the stress-driven nonlocal elasticity model from quasi-static and dynamic experiments,
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES, ISSN: 1537-6494, DOI: 10.1080/15376494.2022.2077488, pp.1-7, 2022Streszczenie: The available experimental results in the literature on the quasi-static bending and free flexural vibration of microcantilevers and nanocantilevers are used to calibrate the length scale parameter of the stress-driven nonlocal elasticity model. The Bernoulli–Euler theory is used to define the kinematic field. The closed form solution derived for the bending problem is used to calibrate the length scale parameter by fitting the load–displacement curves to the experimental results. For the vibration problem, the calibration is done using the least-squares curve fitting method for the natural frequencies. The stress-driven nonlocal theory can adequately capture the size-dependent experimental results. Słowa kluczowe: nonlocal elasticity, stress-driven, experiment, length scale, calibration, MEMS, NEMS Afiliacje autorów:
Darban H. | - | IPPT PAN | Luciano R. | - | Università degli Studi di Napoli "Parthenope" (IT) | Basista M. | - | IPPT PAN |
| | 70p. |
7. |
Maj J., Węglewski W., Bochenek K., Rogal Ł.^{♦}, Woźniacka S., Basista M., A comparative study of mechanical properties, thermal conductivity, residual stresses, and wear resistance of aluminum-alumina composites obtained by squeeze casting and powder metallurgy,
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-021-06401-7, pp.1-10, 2021Streszczenie: Squeeze casting and powder metallurgy techniques were employed to fabricate AlSi12/Al2O3 composites, which are lightweight structural materials with potential applications in the automotive industry. The impact of the processing route on the material properties was studied. Comparative analyses were conducted for the Vickers hardness, flexural strength, fracture toughness, thermal conductivity, thermal residual stresses, and frictional wear. Our results show that the squeeze cast composite exhibits superior properties to those obtained using powder metallurgy. Afiliacje autorów:
Maj J. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Rogal Ł. | - | Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL) | Woźniacka S. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 200p. |
8. |
Witecka A., Valet S.^{♦}, Basista M., Boccaccini A.R.^{♦}, Electrophoretically deposited high molecular weight chitosan/bioactive glass composite coatings on WE43 magnesium alloy,
SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2021.127232, Vol.418, pp.127232-1-14, 2021Streszczenie: Mg-based materials are good candidates for biodegradable bone regeneration implants due to their favorable mechanical properties and an excellent compatibility with human bone. However, too high corrosion/degradation rate in body fluids still limits their applicability. Coatings based on chitosan (CS) and bioactive glass (BG) particles fabricated by electrophoretic deposition (EPD) on Dulbecco's Modified Eagle Medium (DMEM) pre- treated magnesium alloys have promising potential to suppress the substrate corrosion and additionally to incorporate bioactivity. However, the impact of processing parameters or type of coating components on the long-term substrate corrosion behavior and cell response have not been investigated previously. In this study, two types of composite coatings based on a high molecular weight CS (Mw 340–360 kDa, DDA ≥95%) and embedded particles: solid BG (2 μm) and a mixture of BG and mesoporous bioactive glass nanoparticles (MBGN, 100–300 nm with mesopores 2.3–5.6 nm) were fabricated by EPD on DMEM pre-treated WE43 magnesium alloy. It was found that partial replacement of BG particles with MBGN (ratio 3:1) in the composite coating increases the water contact angle, surface roughness and induces a positive cell response. Although the acidic CS-based solutions and applied EPD conditions may decrease the stability of the temporary barrier formed during the DMEM pre-treatment on WE43 substrate therewith slightly increasing its corrosion sensitivity, the composite coating with a mixture of different sizes of particles (BG, MBGN) is a promising candidate for bone regeneration applications. Słowa kluczowe: WE43, magnesium alloy, chitosan, bioactive glass, mesoporous nano bioactive glass, electrophoretic deposition Afiliacje autorów:
Witecka A. | - | IPPT PAN | Valet S. | - | University of Erlangen-Nuremberg (DE) | Basista M. | - | IPPT PAN | Boccaccini A.R. | - | Friedrich-Alexander University of Erlangen-Nürnberg (DE) |
| | 100p. |
9. |
Węglewski W., Pitchai P.^{♦}, Bochenek K., Bolzon G.^{♦}, Konetschnik R.^{♦}, Sartory B.^{♦}, Ebner R.^{♦}, Kiener D.^{♦}, Basista M., Experimental and numerical investigation of the deformation and fracture mode of microcantilever beams made of Cr(Re)/Al2O3 metal–matrix composite,
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-020-05687-3, Vol.51, No.5, pp.2377-2390, 2020Streszczenie: This work presents a combined experimental and computational study of the deformation and fracture of microcantilever specimens made of chromium(rhenium)-alumina metal–matrix composite (MMC), with a particular focus on the failure properties of the metal–ceramic interfaces. The obtained experimental results show that the bending strength of microcantilevers containing alumina particles in critical cross-sections near specimen's fixed end is considerably higher than that of unreinforced chromium(rhenium) samples. Brittle cracking along chromium–alumina interfaces is the dominant fracture mode of the composite microcantilevers. The interface characteristics are determined in an indirect way by numerical simulations of the experiment with account of the actual specimen microstructure from the scanning electron microscope (SEM) images. A parametric study demonstrates that the overall material response may be reproduced by different sets of model parameters, whereas the actual failure mode permits to discriminate among the possible alternatives. Using this approach, the in situ values of the chromium–alumina interface cohesive strength and the fracture energy are estimated. Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Pitchai P. | - | Indian Institute of Science (IN) | Bochenek K. | - | IPPT PAN | Bolzon G. | - | inna afiliacja | Konetschnik R. | - | inna afiliacja | Sartory B. | - | inna afiliacja | Ebner R. | - | inna afiliacja | Kiener D. | - | inna afiliacja | Basista M. | - | IPPT PAN |
| | 200p. |
10. |
Bochenek K., Węglewski W., Morgiel J.^{♦}, Maj M., Basista M., Enhancement of fracture toughness of hot-pressed NiAl-Re material by aluminum oxide addition,
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2020.139670, Vol.790, pp.139670-1-6, 2020Streszczenie: In the search for a remedy to increase the fracture toughness of NiAl, the effect of rhenium and aluminum oxide addition is explored. Using a powder metallurgy processing route an optimum composition of NiAl-Re-Al2O3 material is found which manifests KIC over two times higher than as-received NiAl sintered under the same conditions. Słowa kluczowe: fracture behavior, stress/strain measurements, intermetallics, composites, powder metallurgy, grains and interfaces Afiliacje autorów:
Bochenek K. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Morgiel J. | - | Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL) | Maj M. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 140p. |
11. |
Węglewski W., Krajewski M., Bochenek K., Denis P., Wysmołek A.^{♦}, Basista M., Anomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites,
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2019.138111, Vol.762, pp.138111-1-10, 2019Streszczenie: This paper explores an anomalous size effect in thermal residual stresses occurring in the alumina matrix of Al2O3/Cr sintered composite upon varying the particle size of the chromium reinforcement. When a coarse chromium powder (45 µm mean particle size) is used the average residual stress in the alumina phase after cooling is compressive in accordance with the classical Eshelby solution. However, in the case of a fine chromium (5 µm mean particle size) it switches to tension. This effect, detected by photoluminescence piezospectroscopy, is also confirmed by X-ray and neutron diffraction experiments. As the classical micromechanics models are incapable to capture it, a finite element model is developed with the actual composite microstructure being reconstructed from the microtomography images. It is shown by numerical simulations that the anomalous size effect is associated with the complex microstructure of the composite fabricated with the fine chromium powder. It is also pointed out that the temperature dependence of the coefficients of thermal expansion of the matrix and the reinforcement affects the residual stress levels. Słowa kluczowe: thermal residual stress, metal-ceramic composites, size effect, microcomputed tomography, finite element analysis Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Krajewski M. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Denis P. | - | IPPT PAN | Wysmołek A. | - | Uniwersytet Warszawski (PL) | Basista M. | - | IPPT PAN |
| | 140p. |
12. |
Krajewski M., Węglewski W., Bochenek K., Wysmołek A.^{♦}, Basista M., Optical measurements of thermal residual stresses in alumina reinforced with chromium,
JOURNAL OF APPLIED PHYSICS, ISSN: 0021-8979, DOI: 10.1063/1.5083115, Vol.125, No.13, pp.135104-1-10, 2019Streszczenie: This work describes optical measurements of processing-induced thermal residual stresses in an alumina matrix reinforced with chromium particles. This ceramic-metal composite is manufactured by the powder metallurgy method comprising powder mixing in a planetary ball mill and consolidation by hot pressing. Two different chromium powders (5 μm and 45 μm mean particle size) are used, while the average alumina particle size is kept constant (1 μm). The residual stresses in aluminum oxide are determined by applying two optical methods: photoluminescence piezo-spectroscopy (PLPS) and Raman spectroscopy (RS). Both experimental techniques reveal a chromium size effect in the residual stress measurements. When the fine chromium powder (5 μm) is used, the average residual stress in the ceramic phase is tensile (unusual effect), whereas for the coarser chromium powder (45 μm) it becomes compressive. The PLPS measurements of the hydrostatic residual stress component in the ceramic phase yield the values of 0.290 and −0.130 GPa for samples with 5 μm and 45 μm chromium powders, respectively. In the RS experiments, the corresponding stress component in the alumina equals 0.351 GPa for the composite with 5 μm chromium and −0.158 GPa for that with 45 μm chromium powder. These values indicate that the residual stress in the alumina reinforced with 5 μm chromium is approximately twice higher than that in the alumina reinforced with 45 μm chromium. Finally, the validity of the results obtained with the optical techniques is confirmed by the neutron diffraction measurements. Afiliacje autorów:
Krajewski M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Wysmołek A. | - | Uniwersytet Warszawski (PL) | Basista M. | - | IPPT PAN |
| | 70p. |
13. |
Bochenek K., Węglewski W., Morgiel J.^{♦}, Basista M., Influence of rhenium addition on microstructure, mechanical properties and oxidation resistance of NiAl obtained by powder metallurgy,
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2018.08.032, Vol.735, pp.121-130, 2018Streszczenie: The search for new materials capable of replacing nickel-based superalloys in aerospace applications has increased rapidly in the recent years. One of the candidates for this purpose is nickel aluminide NiAl provided that its main drawback, namely the inferior fracture toughness at room temperature is overcome. We propose rhenium as an addition to NiAl to improve its mechanical properties without compromising on the oxidation resistance. Two powder metallurgy techniques (HP and SPS) were used to obtain NiAl/Re sinters. Small amounts of rhenium (0.6 at.%; 1.25at.%; 1.5 at.%) almost doubled the flexural strength of NiAl and improved its fracture toughness by 60%. Microscopic investigations revealed rhenium particles at the boundaries of NiAl grains resulting in an enhanced fracture toughness. Mass changes during oxidation at 900 oC, 1100 oC and 1300 oC were relatively low. Plausible mechanisms of the fracture toughness enhancement and the oxidation behavior are discussed. Słowa kluczowe: nickel aluminide, rhenium, fracture toughness, oxidation resistance, powder metallurgy, grain boundary strengthening Afiliacje autorów:
Bochenek K. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Morgiel J. | - | Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL) | Basista M. | - | IPPT PAN |
| | 35p. |
14. |
Maj J., Basista M., Węglewski W., Bochenek K., Strojny-Nędza A.^{♦}, Naplocha K.^{♦}, Panzner T.^{♦}, Tatarkova M.^{♦}, Fiori F.^{♦}, Effect of microstructure on mechanical properties and residual stresses in interpenetrating aluminum-alumina composites fabricated by squeeze casting,
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2017.12.091, Vol.715, pp.154-162, 2018Streszczenie: Aluminum-alumina composites with interpenetrating network structure are interesting structural materials due to their high resistance to elevated temperature and frictional wear, good heat conductivity, enhanced mechanical strength and fracture toughness. In this paper aluminum-alumina bulk composites and FGMs are manufactured by pressure infiltration of porous alumina preforms with molten aluminium alloy (EN AC-44200). Influence of the interpenetrating microstructure on the macroscopic bending strength, fracture toughness, hardness and heat conduction is examined. Special focus is on processing-induced thermal residual stresses in aluminium-alumina composites due to their potentially detrimental effects on material performance in structural elements under in-service conditions. The residual stresses are measured experimentally in the ceramic phase by neutron diffraction and simulated numerically using a micro-CT based Finite Element model, which takes into account the actual interpenetrating microstructure of the composite. The model predictions for two different volume fractions of alumina agree fairly well with the neutron diffraction measurements Słowa kluczowe: A. stress measurements, X-ray analysis, finite element analysis, B. composites, C. casting methods Afiliacje autorów:
Maj J. | - | IPPT PAN | Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Strojny-Nędza A. | - | Institute of Electronic Materials Technology (PL) | Naplocha K. | - | Wroclaw University of Science and Technology (PL) | Panzner T. | - | Paul Scherrer Institut (CH) | Tatarkova M. | - | Institute of Materials Research, Slovak Academy of Sciences (SK) | Fiori F. | - | Universita Politecnica delle Marche (IT) |
| | 35p. |
15. |
Poniżnik Z., Nowak Z., Basista M., Numerical modeling of deformation and fracture of reinforcing fibers in ceramic-metal composites,
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS, ISSN: 1056-7895, DOI: 10.1177/1056789515611945, Vol.26, No.5, pp.711-734, 2017Streszczenie: This paper is concerned with numerical modeling of deformation and fracture of a metal ligament bridging the crack faces in ceramic-metal composites, as a prerequisite for the determination of the J integral for composites with interpenetrating microstructure. A finite element model is proposed of an elasto-plastic crack-reinforcing fiber undergoing large plastic deformations and progressive debonding from the elastic matrix through a cohesive matrix-fiber interface. The σ-u relationships are derived first in the case of pullout of an elasto-plastic fiber embedded in an elastic matrix and then in uniaxial tension of the elasto-plastic fiber bridging the crack faces in elastic matrix. The obtained numerical results are discussed and compared with the theoretical predictions reported by other authors. Słowa kluczowe: ceramic–metal composites, fracture modeling, crack bridging, fiber pullout, cohesive interface, fiber debonding, finite element simulations Afiliacje autorów:
Poniżnik Z. | - | IPPT PAN | Nowak Z. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 35p. |
16. |
Basista M., Jakubowska J., Węglewski W., Processing Induced Flaws in Aluminum–Alumina Interpenetrating Phase Composites,
Advanced Engineering Materials, ISSN: 1438-1656, DOI: 10.1002/adem.201700484, Vol.19, No.12, pp.1700484-1-14, 2017Streszczenie: This review paper deals with flaws in aluminum–alumina composites and FGMs induced by their manufacturing processes. Aluminum–alumina composites have been studied for many years as potentially interesting materials for applications, for example, in the automotive sector due to their enhanced mechanical strength, wear resistance, good heat conductivity and low specific weight. The focus here is on the interpenetrating phase composites (IPCs) manufactured by infiltration of porous alumina preforms with molten aluminum alloys. The primary objective is to provide an updated overview of research findings on a variety of flaws occurring at different stages of the manufacturing processes. Some precautions on how to avoid processing induced flaws in aluminum–alumina bulk composites and FGMs are mentioned. Afiliacje autorów:
Basista M. | - | IPPT PAN | Jakubowska J. | - | IPPT PAN | Węglewski W. | - | IPPT PAN |
| | 30p. |
17. |
Strojny-Nędza A.^{♦}, Pietrzak K.^{♦}, Teodorczyk M.^{♦}, Basista M., Węglewski W., Chmielewski M.^{♦}, Influence of Material Ccating on the heat Transfer in a layered Cu-SiC-Cu Systems,
ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2017-0199, Vol.62, No.2B, pp.1311-1314, 2017Streszczenie: This paper describes the process of obtaining Cu-SiC-Cu systems by way of spark plasma sintering. A monocrystalline form of silicon carbide (6H-SiC type) was applied in the experiment. Additionally, silicon carbide samples were covered with a layer of tungsten and molybdenum using chemical vapour deposition (CVD) technique. Microstructural examinations and thermal properties measurements were performed. A special attention was put to the metal-ceramic interface. During annealing at a high temperature, copper reacts with silicon carbide. To prevent the decomposition of silicon carbide two types of coating (tungsten and molybdenum) were applied. The effect of covering SiC with the aforementioned elements on the composite's thermal conductivity was analyzed. Results were compared with the numerical modelling of heat transfer in Cu-SiC-Cu systems. Certain possible reasons behind differences in measurements and modelling results were discussed. Słowa kluczowe: copper matrix composites, silicon carbide, interface, thermal conductivity, modelling Afiliacje autorów:
Strojny-Nędza A. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | inna afiliacja | Teodorczyk M. | - | Institute of Electronic Materials Technology (PL) | Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) |
| | 30p. |
18. |
Basista M., Węglewski W., Bochenek K., Poniżnik Z., Nowak Z., Micro-CT Finite Element Analysis of Thermal Residual Stresses and Fracture in Metal-Ceramic Composites,
Advanced Engineering Materials, ISSN: 1438-1656, DOI: 10.1002/adem.201600725, Vol.19, No.8, pp.1600725-1-9, 2017Streszczenie: This paper presents a simple way of using X-ray micro-computed tomography (micro-CT) in numerical modeling of material properties of metal-ceramic composites. It shows step by step the proposed methodology with details of the finite element mesh creation, so that it can easily be reproduced by interested researchers. Two case studies are considered to show the proposed approach at work: i) determination of processing-induced residual stresses in hot pressed Cr/Al2O3 and NiAl/Al2O3 particulate composites and ii) determination of J-integral for an interpenetrating phase composite made of porous alumina preform infiltrated with molten copper. The method is straightforward and effective but has its limitations that are pointed out. Afiliacje autorów:
Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Poniżnik Z. | - | IPPT PAN | Nowak Z. | - | IPPT PAN |
| | 30p. |
19. |
Kuśnierczyk K., Basista M., Recent advances in research on magnesium alloys and magnesium - calcium phosphate composites as biodegradable implant materials,
JOURNAL OF BIOMATERIALS APPLICATIONS, ISSN: 0885-3282, DOI: 10.1177/0885328216657271, Vol.31, No.6, pp.878-900, 2017Streszczenie: Magnesium alloys are modern biocompatible materials suitable for orthopaedic implants due to their biodegradability in biological environment. Many studies indicate that there is a high demand to design magnesium alloys with controllable in vivo corrosion rates and required mechanical properties. A solution to this challenge can be sought in the development of metal matrix composites based on magnesium alloys with addition of relevant alloying elements and bioceramic particles. In this study, the corrosion mechanisms along with corrosion protection methods in magnesium alloys are discussed. The recently developed magnesium alloys for biomedical applications are reviewed. Special attention is given to the newest research results in metal matrix composites composed of magnesium alloy matrix and calcium phosphates, especially hydroxyapatite or tricalcium phosphate, as the second phase with emphasis on the biodegradation behavior, microstructure and mechanical properties in view of potential application of these materials in bone implants. Słowa kluczowe: biomaterials, biodegradable, metal matrix composites, magnesium alloys, corrosion, hydroxyapatite, bone repair Afiliacje autorów:
Kuśnierczyk K. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 30p. |
20. |
Chmielewski M.^{♦}, Pietrzak K.^{♦}, Basista M., Węglewski W., Rhenium doped chromium–alumina composites for high-temperature applications,
International Journal of Refractory Metals and Hard Materials, ISSN: 0263-4368, DOI: 10.1016/j.ijrmhm.2015.07.012, Vol.54, pp.196-202, 2016Streszczenie: Dense chromium–alumina composites doped with rhenium have been developed by the hot pressing method (bulk composite) and plasma spraying (composite coating). The obtained materials show superior mechanical properties, insensitivity to chemically aggressive environment, good resistance to frictional wear and oxidation at elevated temperature. These enhanced properties make the Cr/Re/Al2O3 composites interesting structural materials for energy and transport applications operating in demanding service conditions, e.g. fluidal boilers in power plants or valve seats in combustion engines. Słowa kluczowe: Metal–ceramic composites, Powder technology, Mechanical properties, Coatings Afiliacje autorów:
Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | inna afiliacja | Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN |
| | 35p. |
21. |
Bochenek K., Basista M., Advances in processing of NiAl intermetallic alloys and composites for high temperature aerospace applications,
PROGRESS IN AEROSPACE SCIENCES, ISSN: 0376-0421, DOI: 10.1016/j.paerosci.2015.09.003, Vol.79, pp.136-146, 2015Streszczenie: Over the last few decades intermetallic compounds such as NiAl have been considered as potential high temperature structural materials for aerospace industry. A large number of investigations have been reported describing complex fabrication routes, introducing various reinforcing/alloying elements along with theoretical analyses. These research works were mainly focused on the overcoming of main disadvantage of nickel aluminides that still restricts their application range, i.e. brittleness at room temperature. In this paper we present an overview of research on NiAl processing and indicate methods that are promising in solving the low fracture toughness issue at room temperature. Other material properties relevant for high temperature applications are also addressed. The analysis is primarily done from the perspective of NiAl application in aero engines in temperature regimes from room up to the operating temperature (over 1150 °C) of turbine blades. Słowa kluczowe: Nickel aluminide, Intermetallics, Turbine blades, Fracture toughness, Manufacturing techniques Afiliacje autorów:
Bochenek K. | - | IPPT PAN | Basista M. | - | IPPT PAN |
| | 50p. |
22. |
Basista M., KMM-VIN AISBL Europejski Instytut Wirtualny Materiałów Wielofunkcyjnych,
Materiały Kompozytowe, ISSN: 2084-1949, Vol.4, pp.48-51, 2015Streszczenie: Współczesne modele prowadzenia badań naukowych i prac rozwojowych w dziedzinie zaawansowanych materiałów konstrukcyjnych i funkcjonalnych wymagają współpracy i integracji zespołów badawczych o uzupełniających się kompetencjach w zakresie metod wytwarzania materiałów, charakteryzacji mikrostruktury, badań właściwości i modelowania. Aby można było myśleć o praktycznym wykorzystaniu wyników badań i innowacjach przemysłowych z nich wynikających konieczny jest aktywny udział przemysłu już na wczesnym etapie powstawania koncepcji projektu, następnie podczas jego realizacji, a zwłaszcza na etapie weryfikacji uzyskanych wyników na demonstratorach i liniach pilotażowych. Słowa kluczowe: Europejski Instytut Wirtualny KMM-VIN AISBL, zaawansowane materiały, współpraca europejska Afiliacje autorów:
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23. |
Węglewski W., Basista M., Manescu A.^{♦}, Chmielewski M.^{♦}, Pietrzak K.^{♦}, Schubert Th.^{♦}, Effect of grain size on thermal residual stresses and damage in sintered chromium–alumina composites: Measurement and modeling,
COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2014.06.027, Vol.67, pp.119-124, 2014Streszczenie: In this paper we present the results of experimental measurements and numerical modeling of the effect of particle size on the residual thermal stresses arising in sintered metal–matrix composites after cooling down from the fabrication temperature. On example of novel Cr(Re)/Al2O3 composites processed by (i) spark plasma sintering and (ii) hot pressing the residual thermal stresses are measured by neutron diffraction technique and determined by a FEM model based on micro-CT scans of the material microstructure. Then numerical model of microcracking induced by residual stresses is applied to predict the effective Young modulus of the damaged composite. Comparison of the numerical results with the measured data of the residual stresses and Young’s modulus is presented and fairly good agreement is noted. Słowa kluczowe: Metal–matrix composites (MMC), Residual/internal stress, Finite element analysis (FEA), Sintering Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Basista M. | - | IPPT PAN | Manescu A. | - | Universita degli Studi di Ancona (IT) | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | inna afiliacja | Schubert Th. | - | Fraunhofer Institut für Fertigungstechnik und Angewandte Materialforschung (DE) |
| | 40p. |
24. |
Węglewski W., Bochenek K., Basista M., Schubert Th.^{♦}, Jehring U.^{♦}, Litniewski J., Mackiewicz S., Comparative assessment of Young’s modulus measurements of metal-ceramic composites using mechanical and non-destructive tests and micro-CT based computational modeling,
COMPUTATIONAL MATERIALS SCIENCE, ISSN: 0927-0256, DOI: 10.1016/j.commatsci.2013.04.007, Vol.77, pp.19-30, 2013Streszczenie: It is commonly known that the available non-destructive and mechanical methods of the Young modulus measurement yield different results. This paper presents comparison of the results of experimental determination and numerical modeling of the Young modulus of Cr–Al2O3–Re composites (MMC) processed by a powder metallurgical method (SPS). In the computational model a finite element analysis is combined with images of the real material microstructure obtained from micro-computed tomography (micro-CT). Experimental measurements were carried out by four testing methods: three-point bending, resonance frequency damping analysis (RFDA), ultrasonic pulse-echo technique, and scanning acoustic microscopy. The paper also addresses the issue which of the four experimental methods at hand gives results closest to the theoretical predictions of the micro-CT based FEM model. Słowa kluczowe: Finite element analysis (FEA), Micro-CT based FE model, Metal matrix composites, Elastic modulus, Mechanical and nondestructive techniques Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Bochenek K. | - | IPPT PAN | Basista M. | - | IPPT PAN | Schubert Th. | - | Fraunhofer Institut für Fertigungstechnik und Angewandte Materialforschung (DE) | Jehring U. | - | Fraunhofer Institut für Fertigungstechnik und Angewandte Materialforschung (DE) | Litniewski J. | - | IPPT PAN | Mackiewicz S. | - | IPPT PAN |
| | 30p. |
25. |
Basista M., Pietrzak K.^{♦}, Węglewski W., Chmielewski M.^{♦}, Kompozyty spiekane Cr-Al2O3 z dodatkiem renu. Wytwarzanie, właściwości, modelowanie, zastosowania,
RUDY I METALE NIEŻELAZNE, ISSN: 0035-9696, Vol.R58, No.10, pp.556-563, 2013Streszczenie: Celem pracy było zbadanie wpływu dodatku renu na właściwości termomechaniczne i użytkowe kompozytów Cr-Al2O3 wytwarzanych metodą spiekania pod ciśnieniem w prasie HP oraz metodą Spark Plasma Sintering (SPS). Uzyskano kompozyty o gęstości przekraczającej 98% gęstości teoretycznej. Właściwości mechaniczne (m.in. moduł Younga, wytrzymałość na zginanie, twardość, odporność na pękanie, granica plastycznośći) oraz odporność na utlenianie wytworzonych materiałów są obiecujące. Zbudowano model numeryczny do obliczeń wielkości naprężeń resztkowych obecnych w materiałach faz kompozytu po procesie spiekania oraz modułów sprężystości. Wykorzystano w tym celu obrazy rzeczywistej mikrostruktury kompozytu otrzymane z tomografii komputerowej. Uzyskano dobrą zgodność wyników modelu z wynikami pomiarów naprężeń metodą XRD. Przedstawiono ponadto porównanie wyników obliczeń numerycznych i pomiarów modułu Younga przy zastosowaniu różnych metod Słowa kluczowe: kompozyty MMC, metalurgia proszków, modelowanie MES, mikrotomografia komputerowa, naprężenia resztkowe Afiliacje autorów:
Basista M. | - | IPPT PAN | Pietrzak K. | - | inna afiliacja | Węglewski W. | - | IPPT PAN | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) |
| | 7p. |
26. |
Węglewski W., Basista M., Chmielewski M.^{♦}, Pietrzak K., Modeling of thermally induced damage in the processing of Cr–Al_{2}O_{3} composites,
COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2011.07.016, Vol.43B, No.2, pp.255-264, 2012Streszczenie: Thermal stresses induced during the cooling of Cr–Al2O3 (MMC) processed by sintering are modeled numerically using the FEA. The composite microstructure is modeled as (i) random distribution of ceramic particles (voxels) in the metal matrix, and (ii) using micro-CT scans of the real microstructure transformed into a FE mesh. Numerical simulations of the thermal residual stresses are compared with the test data measured by X-ray diffraction. A simple numerical model is then proposed to predict the overall elastic properties of the composite with account of the porosity and damage induced by the thermal stresses. Comparison of the model predictions with the measured data for Young’s modulus is presented. Słowa kluczowe: Metal-matrix composites (MMCs), Residual/internal stress, Finite element analysis (FEA), Sintering Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Basista M. | - | IPPT PAN | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | IPPT PAN |
| | 45p. |
27. |
Basista M., Poniżnik Z., Modelling of effective elastic properties and crack bridging in metal-ceramic interpenetrating phase composites,
World Journal of Engineering, ISSN: 1708-5284, Vol.7, pp.95-96, 2010Streszczenie: The metal-ceramic interpenetrating phase composites (IPC) are usually processed by pressure assisted or pressureless infiltration of molten metals into porous ceramic performs. They have characteristic microstructure different than typical MMC or CMC with particulate or fiber reinforcement. The main difference is that both metal and ceramic phases are spatially continuous forming complementary 3D skeletons of non-zero stiffness. The uniform microstructure, enhanced mechanical and thermal properties are the main advantages of IPC. A state-of-the art in fracture and damage modelling of IPC can be found in [1], while models of effective properties in [2] and [3]. The objective of this paper is twofold: (i) to model the effective elastic properties of IPC, and (ii) to model the fracture in IPC with the crack bridging being the major toughening mechanism. The developed models are verified on the example of Al2O3-Cu infiltrated composites.
[1] Basista M. and Weglewski W. (2006). Modelling of damage and fracture in ceramic-matrix composites – an overview, J. Theor. Appl. Mech., 44, 455-484.
[2] Feng X., Tian Z., Liu Y. and Yu S. (2004). Effective elastic and plastic properties of interpenetrating multiphase composites, Appl. Comp. Mater., 11, 33-55.
[3] Poniznik Z., Salit V., Basista M. and Gross D. (2008). Effective elastic properties of interpenetrating phase composites, Comp. Mat. Sci., 44, 813-820. Słowa kluczowe: Interpenetrating phase composites, effective elastic properties, crack bridging Afiliacje autorów:
Basista M. | - | IPPT PAN | Poniżnik Z. | - | IPPT PAN |
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28. |
Węglewski W., Chmielewski M.^{♦}, Kaliński D.^{♦}, Pietrzak K., Basista M., Thermal residual stresses generated during processing of Cr/Al2O3 composites and their influence on macroscopic elastic properties,
Advances in Science and Technology, ISSN: 1662-0356, DOI: 10.4028/www.scientific.net/AST.65.27, Vol.65, pp.27-32, 2010Streszczenie: This work is focused on the modeling of thermal stresses induced during the fabrication of the metal/ceramic composites. On example of Cr-Al2O3 composite processed by powder metallurgy, thermal stresses after fabrication are determined by FEM model for different contents of metal and ceramic phases. Numerical model of microcracking induced by thermal stresses is then proposed and applied to compute the overall elastic properties of the damaged composite. Comparison of the model predictions with the measur ed data for Young's modulus is presented. Słowa kluczowe: Cr-Al2O3 composite, mechanical properties, thermal stress modeling, microcracking, Young’s modulus modeling Afiliacje autorów:
Węglewski W. | - | IPPT PAN | Chmielewski M. | - | Institute of Electronic Materials Technology (PL) | Kaliński D. | - | Institute of Electronic Materials Technology (PL) | Pietrzak K. | - | IPPT PAN | Basista M. | - | IPPT PAN |
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29. |
Basista M., Węglewski W., Chemically assisted damage of concrete: a model of expansion under external sulfate attack,
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS, ISSN: 1056-7895, Vol.18, pp.155-175, 2009Streszczenie: A micromechanical model is proposed to simulate the deformation of cementitious composites exposed to external sulfate attack. The model involves coupled physico-chemical processes of nonsteady diffusion with reaction, topo-chemical reaction of ettringite formation, expansion of ettringite inclusions, microcracking of hardened cement paste and percolation of sulfates through heavily deteriorated mortar. The Fick’s second law with reaction term is assumed to govern the transport of the sulfate ions. The Eshelby solution and the equivalent inclusion method are used to determine the eigenstrain of expanding ettringite crystals in microcracked hardened cement paste. The degradation of transport properties is studied in the effective medium and the percolation regime. An initial boundary value problem (2D) of expansion of a mortar specimen immersed in a sodium sulfate solution is solved and compared with available test data. Słowa kluczowe: chemo-damage, micromechanics, concrete, microcracking, sulfate attack Afiliacje autorów:
Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN |
| | 32p. |
30. |
Poniżnik Z., Salit V.^{♦}, Basista M., Gross D.^{♦}, Effective elastic properties of interpenetrating phase composites,
COMPUTATIONAL MATERIALS SCIENCE, ISSN: 0927-0256, DOI: 10.1016/j.commatsci.2008.06.010, Vol.44, pp.813-820, 2008Streszczenie: Objective of this paper is to estimate the effective elastic properties of metal-ceramic interpenetrating phase composites (IPC). To this end, approximate analytical models such as Feng’s and Tuchinskii’s model were employed and checked against Voigt, Reuss, and Hashin–Shtrikman bounds. On the other hand, the overall elastic properties of IPC were determined by means of some numerical models suitable for the interpenetrating networks with model microstructures. A real Al2O3–Cu microstructure acquired from the computer tomography images was also used for numerical simulations. Słowa kluczowe: Interpenetrating phase composites, Metal-ceramic composites, Effective elastic moduli, Finite element method, Micromechanics, Microstructure Afiliacje autorów:
Poniżnik Z. | - | IPPT PAN | Salit V. | - | inna afiliacja | Basista M. | - | IPPT PAN | Gross D. | - | inna afiliacja |
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31. |
Basista M., Węglewski W., Micromechanical modelling of sulphate corrosion in concrete: Influence of ettringite forming reaction,
Theoretical and Applied Mechanics, ISSN: 1450-5584, DOI: 10.2298/TAM0803029B, Vol.35, No.1-3, pp.29-52, 2008Streszczenie: Two micromechanical models are developed to simulate the expansion of cementitious composites exposed to external sulphate attack. The di®erence between the two models lies in the form of chemical reaction of the ettringite formation (through-solution vs. topochemical). In both models the Fick's second law with reaction term is assumed to govern the transport of the sulphate ions. The Eshelby solution and the equivalent inclusion method are used to determine the eigenstrain of the expanding ettringite crystals in microcracked hardened cement paste. The degradation of transport properties is studied in the efective medium and the percolation regime. An initial-boundary value problem (2D) of expansion of a mortar specimen immersed in a sodium sulphate solution is solved and compared with available test data. The obtained results indicate that the topochemical mechanism is the one capable of producing the experimentally observed amount of expansion. Słowa kluczowe: chemo-damage, sulphate attack, topochemical reaction, through-solution reaction, ettringite, micromechanics, microcracking, percolation Afiliacje autorów:
Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN |
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32. |
Basista M., Węglewski W., Modelling of damage and fracture in ceramic-matrix composites,
JOURNAL OF THEORETICAL AND APPLIED MECHANICS, ISSN: 1429-2955, Vol.44, No.3, pp.455-484, 2006Streszczenie: This is a review paper on the existing approaches to modelling of discrete cracks (fracture) and diffuse microcracking (damage) in ceramic matrix composites under mechanical or thermal loading. The focus is on Ceramic Matrix Composites (CMC) with metal particle inclusions and on interpenetrating metal ceramic networks. The second phase in form of ceramic inclusions is not considered. The models of toughening mechanisms are discussed in considerable detail. Sections 2-5 deal with discrete cracks while Sections 6-9 with diffuse microcracking. The paper is concluded with identification of unresolved problems and topics for future research in the area of fracture and damage of CMC. Słowa kluczowe: ceramic matrix composites, particles, interpenetrating networks, fracture, damage, toughening mechanisms, bridging, cracks, microcracks, cavitation, debonding Afiliacje autorów:
Basista M. | - | IPPT PAN | Węglewski W. | - | IPPT PAN |
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33. |
Basista M., Micromechanical and Lattice Modeling of Brittle Damage (Praca habilitacyjna),
Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.3, pp.1-237, 2001 | |
34. |
Basista M., Równania konstytutywne i ocena nośności granicznej ośrodków ze wstępną anizotropią struktury (Praca doktorska),
Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.41, pp.1-96, 1985 | |
35. |
Basista M., O kontynualnych modelach uszkodzenia materiałów,
Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.40, pp.1-53, 1984 | |
36. |
Basista M., Dolna ocena nośności granicznej ośrodków plastycznie anizotropowych w płaskim stanie odkształcenia,
Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.2, pp.1-29, 1981 | |