Publications in journals ranked by Journal Citation Reports (JCR) 
Publications in other journals ranked by Ministry of Science and Higher Education
Conference publications indexed in the Web of Science Core Collection
Publications in other journals and conference proceedings
Affiliation to IPPT PAN

1.Kowalczyk-Gajewska K., Pieczyska E.A., Golasiński K., Maj M., Kuramoto S., Furuta T., A finite strain elastic-viscoplastic model of Gum Metal, International Journal of Plasticity, ISSN: 0749-6419, DOI: 10.1016/j.ijplas.2019.02.017, Vol.119, pp.85-101, 2019
Kowalczyk-Gajewska K., Pieczyska E.A., Golasiński K., Maj M., Kuramoto S., Furuta T., A finite strain elastic-viscoplastic model of Gum Metal, International Journal of Plasticity, ISSN: 0749-6419, DOI: 10.1016/j.ijplas.2019.02.017, Vol.119, pp.85-101, 2019

Abstract:
A hyperelastic-viscoplastic model of Gum Metal is presented. The model is formulated in the large strain framework. The free energy function is postulated consisting of the hyperelastic and viscoplastic components. Original extension of the Neo-Hooke model with a power law component is proposed for hyperelasticity, which enables to describe a relatively large non-linear elastic regime observed for the alloy. Viscoplastic strain follows the Perzyna-type law with an overstress function. The model is implemented into the finite element method and used to simulate the Gum Metal response in multiple tension loading-unloading cycles. The results are compared with experimental outcomes. Good accordance of the simulation results and the available experimental data is obtained.

Keywords:
Large strain, Hyperelasto-viscoplasticity, Gum metal, Cyclic deformation

2.Massaq A., Rusinek A., Klosak M., Bahi S., Arias A., Strain rate effect on the mechanical behavior of polyamide composites under compression loading, COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2019.01.101, Vol.214, pp.114-122, 2019
Massaq A., Rusinek A., Klosak M., Bahi S., Arias A., Strain rate effect on the mechanical behavior of polyamide composites under compression loading, COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2019.01.101, Vol.214, pp.114-122, 2019

Abstract:
This paper presents an experimental study on the effect of strain rate on the compressive behavior of polyamide composites. Contrary to thermoset woven reinforced composites, thermoplastic woven reinforced composites have always received less interest despite its excellent damage and impact resistances. In this context, this work aims to study the behavior of fiber reinforced thermoplastic composites submitted to high strain rate in compression. The tested material is a thermoplastic composite made of armor tissue of equilibrate glass fiber and the matrix is composed of Polyamide 6 (PA6/Glass). The material is prepared with the fibers woven in 0/90 direction.The compressive mechanical response of PA6/Glass composite was determined in the transverse and longitudinal fibers directions at quasi-static and high strain rates. The hydraulic machine and Split Hopkinson Pressure Bar experiments were conducted to determine the dynamic and quasi static compressive deformation and fracture of the PA6/Glass at strain rates from 10−5 s−1 to 1 s−1 and 100 s−1 to 2500 s−1, respectively.In this work, the main goals were to determine the strain rate effect on: elastic modulus, failure stress and failure energy as a function of the loading direction. The strain rate sensitivity of the failure stress level and failure energy were observed. In addition, the failure mechanism was characterized by examining the fracture surfaces using the scanning electron microscopy (SEM) method.In quasi-static conditions of loading, the material reached its capacity due to the formation of shear bands, that concerned all three tested compression directions. In dynamics, the failure took place by shearing followed by delamination. In case of dynamic loading in the direction perpendicular to fibers, the observations made by SEM showed that the failure of the composite had a fragile nature.

Keywords:
Woven composite, Dynamic behaviour, Dynamic fracture, Split Hopkinson Pressure Bar, Failure energy, Anisotropy, Strain rate

3.Piotrowski T., Glinicka J., Glinicki M.A., Prochoń P., Influence of gadolinium oxide and ulexite on cement hydration and technical properties of mortars for neutron radiation shielding purposes, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2018.11.076, Vol.195, pp.583-589, 2019
Piotrowski T., Glinicka J., Glinicki M.A., Prochoń P., Influence of gadolinium oxide and ulexite on cement hydration and technical properties of mortars for neutron radiation shielding purposes, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2018.11.076, Vol.195, pp.583-589, 2019

Abstract:
Gadolinium oxide (Gd2O3) is a potentially effective mineral additive that improves neutron shielding properties of cement based composites. The paper presents the influence of Gd2O3 and ulexite (a boron compound) on Portland cement hydration evaluated by isothermal calorimetry measurements and strength. The progress of hydration was investigated on mortar specimens at water to cement ratio w/c = 0.5 and sand/cement ratio 0.75. The addition of Gd2O3 generates a slight retardation of cement hydration, however it accelerates aluminate activity at the same time. The hydration of cement was completely hindered for mortars containing a substantial content of ulexite. The strength test results show that addition of Gd2O3 to Portland cement mortar mix caused a decrease of early age (3 days) flexural and compressive strength. The optimum content of Gd2O3 in respect to the long term compressive strength and the hydration kinetics was 5% in relation to the mass of cement. Good long term strength was also obtained for specimens with 3% of ulexite.

Keywords:
Gadolinium oxide generates a slight retardation of cement hydration, Gadolinium oxide increases hydration intensity by aluminate activity acceleration, Gadolinium oxide optimum content is 5% in relation to the mass of cement, A substantial content of ulexite hinders almost completely the cement hydration, Good long term performance were obtained also for specimens with 3% of ulexite

4.Jaskulski R., Glinicki M.A., Ranachowski Z., Kubissa W., Organic phosphorus compounds as heat release regulators in hardening shielding concrete, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2019.03.081, Vol.209, pp.167-175, 2019
Jaskulski R., Glinicki M.A., Ranachowski Z., Kubissa W., Organic phosphorus compounds as heat release regulators in hardening shielding concrete, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2019.03.081, Vol.209, pp.167-175, 2019

Abstract:
The paper presents the results of the study of the influence of the addition of retarding superplasticising admixture based on triisobutyl phosphate and modified phosphonates on the amount of heat generated by hardening shielding concrete. A four-point measurement of the heat generated during the hardening of concrete with an admixture dose of 0, 0.5, 1.0 and 2.0% by weight of the cement was made and the concurrent measurement of the heat released by the hardening cement paste was measured with an isothermal calorimeter. Based on the results from the calorimeter, the effect of the admixture on the temperature field in the hardening concrete mass elements was simulated for different aggregates. The results indicate that the admixture clearly lowers the temperature gradient in hardening mass concrete. In the simulations, the most clear effect was achieved in the case of concrete with barite aggregate, where the gradient value was reduced from 10 C/m to 8 C/m for an admixture content equal to 2.0%. 2019 Elsevier Ltd. All rights reserved.

Keywords:
Temperature gradient, Heat release, Shielding concrete, Mass concrete, Fresh concrete, Phosphorus compounds

5.Dąbrowski M., Glinicki M.A., Dziedzic K., Antolik A., Validation of sequential pressure method for evaluation of the content of microvoids in air entrained concrete, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2019.08.014, Vol.227, No.116633, pp.1-12, 2019
Dąbrowski M., Glinicki M.A., Dziedzic K., Antolik A., Validation of sequential pressure method for evaluation of the content of microvoids in air entrained concrete, CONSTRUCTION AND BUILDING MATERIALS, ISSN: 0950-0618, DOI: 10.1016/j.conbuildmat.2019.08.014, Vol.227, No.116633, pp.1-12, 2019

Abstract:
The suitability of the sequential air pressure method (SAM) to evaluate the quality of air entrainment in concrete mix to support prediction of durability of hardened concrete was studied. The experiments included both laboratory-produced mixes and on-site trials on mixes delivered for highway pavement construction. The fresh air content and the air void distribution was tested using the SAM apparatus. The air content and the air void characteristics in hardened concrete was tested using the microscopic analysis on polished sections. Standard fresh mix properties were also tested and the compressive strength and salt-scaling resistance of concrete was determined. Effects of type and proportion of admixtures, type of crushed aggregate, timing of SAM measurements and the method of mix consolidation were analyzed. The relationship between the SAM number and the air void characteristics in hardened concrete was critically evaluated. The relationship between SAM number and the content of microvoids (A300) is found for the laboratory mixes and confirmed with few field test results. The criterion of SAM number ≤ 0.4 is proposed for the target microvoids content A300 ≥ 1.5% and the enhanced salt scaling resistance of concrete.

Keywords:
Air entrainment, Air void distribution, Concrete durability, Fresh concrete, Frost-salt scaling, Microvoids content, Mix design, Sequential pressure method, Spacing factor, Test methods

6.Knor G., Jaskulski R., Glinicki M.A., Holnicki-Szulc J., Numerical identification of the thermal properties of early age concrete using inverse heat transfer problem, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISSN: 0017-9310, DOI: 10.1007/s00231-018-2504-2, Vol.55, No.4, pp.1215-1227, 2019
Knor G., Jaskulski R., Glinicki M.A., Holnicki-Szulc J., Numerical identification of the thermal properties of early age concrete using inverse heat transfer problem, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISSN: 0017-9310, DOI: 10.1007/s00231-018-2504-2, Vol.55, No.4, pp.1215-1227, 2019

Abstract:
The procedure of numerical identification of thermophysical properties of concrete during its hardening is presented. Heat of cement hydration, thermal conductivity and specific heat are determined for purpose of modelling temperature evolution in massive concrete elements. The developed method is based on point temperature measurements in a cylindrical mould and the numerical solution of the inverse heat transfer problem by means of direct search optimization algorithm. The determined thermal characteristics of concrete are not constant and depend on the maturity of concrete. The procedure was verified on set of concrete mixes designed with Portland cement CEM I 42.5R and Portland-slag cement CEM II/B-S 32.5 N. Calcareous fly ash was also used for partial replacement of cement in the mixtures. The obtained results have been compared with experimentally measured temperature in concrete and a fair agreement has been found.

7.Jaskulski R., Glinicki M.A., Kubissa W., Dąbrowski M., Application of a non-stationary method in determination of the thermal properties of radiation shielding concrete with heavy and hydrous aggregate, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISSN: 0017-9310, DOI: 10.1016/j.ijheatmasstransfer.2018.07.050, Vol.130, pp.882-892, 2019
Jaskulski R., Glinicki M.A., Kubissa W., Dąbrowski M., Application of a non-stationary method in determination of the thermal properties of radiation shielding concrete with heavy and hydrous aggregate, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISSN: 0017-9310, DOI: 10.1016/j.ijheatmasstransfer.2018.07.050, Vol.130, pp.882-892, 2019

Abstract:
Results of measurements of the specific heat and the thermal conductivity of concrete with blended special aggregate for neutron and gamma radiation shielding are presented. Experimental tests were performed on concrete with heavyweight aggregate (magnetite, barite), hydrogen-bearing aggregate (serpentine) and amphibolite aggregate. The thermal properties of concrete were determined using a nonstationary method. The highest specific heat was found for concrete with serpentine aggregate. Simple models for predicting the specific heat and the thermal conductivity on the basis of concrete mix design were evaluated to include the blends of heavyweight and hydrogen-bearing aggregates. The thermal conductivity of concrete was found to be linearly dependent on the concrete density in the range from 2200 to 3500 kg/m3. Its increase due to water saturation of concrete was not dependent on the open porosity of concrete. It was found that the specific heat can be fairly well predicted using the rule of mixtures formula. The thermal conductivity of concrete can be approximately predicted using a parallel model in the case of water-saturated concrete. The thermal conductivity prediction for dry concrete is also discussed.

Keywords:
Blended aggregate, Concrete mix design, Density, Non-stationary method, Open porosity, Thermal properties, Thermal conductivity, Specific heat, Radiation shielding

8.Sadowski Ł., Piechówka-Mielnik M., Widziszowski T., Gardynik A., Mackiewicz S., Hybrid ultrasonic-neural prediction of the compressive strength of environmentally friendly concrete screeds with high volume of waste quartz mineral dust, Journal of Cleaner Production, ISSN: 0959-6526, DOI: 10.1016/j.jclepro.2018.12.059, Vol.212, pp.727-740, 2019
Sadowski Ł., Piechówka-Mielnik M., Widziszowski T., Gardynik A., Mackiewicz S., Hybrid ultrasonic-neural prediction of the compressive strength of environmentally friendly concrete screeds with high volume of waste quartz mineral dust, Journal of Cleaner Production, ISSN: 0959-6526, DOI: 10.1016/j.jclepro.2018.12.059, Vol.212, pp.727-740, 2019

Abstract:
The article presents the hybrid ultrasonic-neural assessment of the compressive strength of low-strength concrete screeds modified using high volume of mineral dusts sourced from industrial wastes. Quartz and quartz-feldspar dusts were selected to replace up to the 60% of the cement mass. The principal aim of this study is to carry out a systematic investigation of the effect of the addition of selected dusts on the compressive strength of such modified concrete screeds. The ultrasonic pulse velocity (UPV) technique was used for this purpose. After UPV analysis, about 13 different compositions were tested after 28 days for their compressive strengths (ranging from about 4 to 16 MPa). The relationship between the ultrasound velocity and compressive strength of the low-strength concrete screeds was found to be not acceptable. Finally, the artificial neural networks (ANNs) were employed to predict the compressive strength based on the composition of the concrete and UPV velocity. The obtained values of linear correlation coefficient (R) equal to 0.93, 0.91 and 0.94 respectively for learning, testing and validation phase were satisfactory for reliable evaluation of the compressive strength of environmentally friendly low-strength concrete screeds modified using high volume of waste quartz mineral dusts

Keywords:
Partial replacement of ordinary cement with waste quartz dusts was studied, The utilization of waste quartz mineral dust in concrete screeds was promising, Hybrid ultrasonic-neural prediction of the compressive strength was presented, Waste quartz mineral dusts can be used in screeds for nonstructural applications, The algorithm Broyden-Fletcher-Goldfarb-Shanno (BFGS) was selected

9.Chrzanowska-Giżyńska J., Denis P., Giżyński M., Kurpaska Ł., Mihailescu I., Ristoscu C., Szymański Z., Mościcki T., Thin WBx and WyTi1−yBx films deposited by combined magnetron sputtering and pulsed laser deposition technique, APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2019.02.006, Vol.478, pp.505-513, 2019
Chrzanowska-Giżyńska J., Denis P., Giżyński M., Kurpaska Ł., Mihailescu I., Ristoscu C., Szymański Z., Mościcki T., Thin WBx and WyTi1−yBx films deposited by combined magnetron sputtering and pulsed laser deposition technique, APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2019.02.006, Vol.478, pp.505-513, 2019

Abstract:
The coatings of tungsten borides (WBx) and tungsten borides doped with titanium (WyTi1−yBx) were deposited by using combined magnetron sputtering - pulsed laser deposition technique. In the case of WBx coatings, pure tungsten target was evaporated by a laser pulse at 1064 nm wavelength and pure boron target was sputtered by a magnetron. In the case of WyTi1−yBx coatings, the W2B5 target was sputtered by the magnetron and titanium target was evaporated by the laser pulse at 1064 nm wavelength. The content of titanium dopant changed from 1.1 to 5.5 at.%. The microstructure, chemical and phase composition of deposited coatings were investigated by means of Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, X-Ray Photoelectron Spectroscopy and X-Ray Diffractometry, respectively. The Vickers hardness and Young's modulus were determined by using the nanoindentation test. Nanocrystalline WB coatings with dominant WB2 phase were obtained at a substrate temperature of 520 °C. The coatings were superhard with a hardness of 47–50 GPa and the mean value of surface roughness was <6 nm. The WBx coatings doped with 5.5 at.% Ti had hardness similar to the coatings sputtered by magnetron from W2B5 target.

Keywords:
The superhard WyBx thin films was deposited with hybrid laser-magnetron technology, The MS-PLD method allows for the deposition of ternary borides such as WyTi1−yBx, The MS-PLD method enables to control the chemical and phase composition of films, The deposited films are smooth with hardness above 50 GPa, Crystalline films were deposited only on a substrate kept an elevated temperature

10.Levintant-Zayonts N., Starzyński G., Kopeć M., Kucharski S., Characterization of NiTi SMA in its unusual behaviour in wear tests, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2019.05.005, Vol.137, pp.313-323, 2019
Levintant-Zayonts N., Starzyński G., Kopeć M., Kucharski S., Characterization of NiTi SMA in its unusual behaviour in wear tests, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2019.05.005, Vol.137, pp.313-323, 2019

Abstract:
The manuscript presents experimental investigations of an unusual behaviour of shape memory alloys (NiTi) having different characteristic temperatures in wear test. The studies are focused on the different wear mechanism at varying loads and sliding times and include a description of the phenomena accompanying the wear process. The ball-on-plate reciprocating sliding wear tests were conducted on NiTi shape memory alloys against a sapphire ball. We show that the wear resistance of NiTi is affected by its specific stress-strain characteristic. The understanding of the tribological behaviour of NiTi, a knowledge of the course of wear and an examination of its mechanisms can enable an effective prevention of the destruction of devices components and prolong their safe working life.

Keywords:
Wear behaviour of NiTi SMA, Friction coefficient, Superelasticity, Shape memory effect

11.Li Z., Qu H., Chen F., Wang Y., Tan Z., Kopeć M., Wang K., Zheng K., Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12020223, Vol.12, No.2-223, pp.1-14, 2019
Li Z., Qu H., Chen F., Wang Y., Tan Z., Kopeć M., Wang K., Zheng K., Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12020223, Vol.12, No.2-223, pp.1-14, 2019

Abstract:
Near- α titanium alloys have extensive applications in high temperature structural components of aircrafts. To manufacture complex-shaped titanium alloy panel parts with desired microstructure and good properties, an innovative low-cost hot stamping process for titanium alloy was studied in this paper. Firstly, a series of hot tensile tests and Scanning Electron Microscope (SEM) observations were performed to investigate hot deformation characteristics and identify typical microstructural evolutions. The optimal forming temperature range is determined to be from 750 °C to 900 °C for hot stamping of TA15. In addition, a unified mechanisms-based material model for TA15 titanium alloy based on the softening mechanisms of recrystallization and damage was established, which enables to precisely predict stress-strain behaviors and potentially to be implemented into Finite Element (FE) simulations for designing the reasonable processing window of structural parts for the aerospace industry

Keywords:
TA15, hot stamping, phase evolution, deformation, modelling

12.Ranachowski Z., Ranachowski P., Dębowski T., Gorzelańczyk T., Schabowicz K., Investigation of Structural Degradation of Fiber Cement Boards Due to Thermal Impact, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12060944, Vol.12, No.944, pp.1-14, 2019
Ranachowski Z., Ranachowski P., Dębowski T., Gorzelańczyk T., Schabowicz K., Investigation of Structural Degradation of Fiber Cement Boards Due to Thermal Impact, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12060944, Vol.12, No.944, pp.1-14, 2019

Abstract:
The aim of the present study was to investigate the degradation of the microstructure and mechanical properties of fiber cement board (FCB), which was exposed to environmental hazards, resulting in thermal impact on the microstructure of the board. The process of structural degradation was conducted under laboratory conditions by storing the FCB specimens in a dry, electric oven for 3 h at a temperature of 230 °C. Five sets of specimens, that differed in cement and fiber content, were tested. Due to the applied heating procedure, the process of carbonization and resulting embrittlement of the fibers was observed. The fiber reinforcement morphology and the mechanical properties of the investigated compositions were identified both before, and after, their carbonization. Visual light and scanning electron microscopy, X-ray micro tomography, flexural strength, and work of flexural test Wf measurements were used. A dedicated instrumentation set was prepared to determine the ultrasound testing (UT) longitudinal wave velocity cL in all tested sets of specimens. The UT wave velocity cL loss was observed in all cases of thermal treatment; however, that loss varied from 2% to 20%, depending on the FCB composition. The results obtained suggest a possible application of the UT method for an on-site assessment of the degradation processes occurring in fiber cement boards.

Keywords:
cement-based composites, fiber cement boards, durability, ultrasound measurements

13.Dunić V., Pieczyska E.A., Kowalewski Z.L., Matsui R., Slavković R., Experimental and Numerical Investigation of Mechanical and Thermal Effects in TiNi SMA during Transformation-Induced Creep Phenomena, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12060883, Vol.12(6), No.883, pp.1-13, 2019
Dunić V., Pieczyska E.A., Kowalewski Z.L., Matsui R., Slavković R., Experimental and Numerical Investigation of Mechanical and Thermal Effects in TiNi SMA during Transformation-Induced Creep Phenomena, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12060883, Vol.12(6), No.883, pp.1-13, 2019

Abstract:
The paper presents experimental and numerical results of the TiNi shape memory alloy (SMA) subjected to a modified program of force-controlled tensile loading. The time-dependent development of transformation strain under the constant-force conditions was investigated to describe transformation-induced creep phenomena. (2) Mechanical characteristics of the TiNi SMA were derived using a testing machine, whereas the SMA temperature changes accompanying its deformation were obtained in a contactless manner with an infrared camera. A 3D coupled thermo-mechanical numerical analysis, realized in a partitioned approach, was applied to describe the SMA mechanical and thermal responses. (3) The stress and related temperature changes demonstrated how the transformation-induced creep process started and evolved at various stages of the SMA loading. The proposed model reproduced the stress, strain and temperature changes obtained during the experiment well; the latent heat production is in correlation with the amount of the martensitic volume fraction. (4) It was demonstrated how the transformation-induced creep process occurring in the SMA under such conditions was involved in thermo-mechanical couplings and the related temperature changes.

Keywords:
TiNi shape memory alloy, phase transformation-induced creep, martensitic transformation, temperature change, thermomechanical couplings, infrared camera, thermo-mechanical coupled numerical analysis

14.Glinicki M.A., Jóźwiak-Niedźwiedzka D., Dąbrowski M., The Influence of Fluidized Bed Combustion Fly Ash on the Phase Composition and Microstructure of Cement Paste, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12172838, Vol.12, No.2838, pp.1-14, 2019
Glinicki M.A., Jóźwiak-Niedźwiedzka D., Dąbrowski M., The Influence of Fluidized Bed Combustion Fly Ash on the Phase Composition and Microstructure of Cement Paste, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12172838, Vol.12, No.2838, pp.1-14, 2019

Abstract:
Fly ashes from coal combustion in circulating fluidized bed boilers in three power plants were tested as a potential additive to cement binder in concrete. The phase composition and microstructure of cement pastes containing fluidized bed fly ash was studied. The fractions of cement substitution with fluidized bed fly ash were 20% and 30% by weight. X-ray di#raction (XRD) tests and thermal analyses (derivative thermogravimetry (DTG), di#erential thermal analysis (DTA) and thermogravimetry (TG)) were performed on ash specimens and on hardened cement paste specimens matured in water for up to 400 days. Quantitative evaluation of the phase composition as a function of fluidized bed fly ash content revealed significant changes in portlandite content and only moderate changes in the content of ettringite.

Keywords:
clean coal combustion, fluidized bed fly ash, microstructure, phase composition, portlandite, unburned carbon

15.Yiu B.Y.S., Walczak M., Lewandowski M., Yu A.C.H., Live Ultrasound Color Encoded Speckle Imaging Platform for Real-Time Complex Flow Visualization In Vivo, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, ISSN: 0885-3010, DOI: 10.1109/TUFFC.2019.2892731, Vol.66, No.4, pp.656-668, 2019
Yiu B.Y.S., Walczak M., Lewandowski M., Yu A.C.H., Live Ultrasound Color Encoded Speckle Imaging Platform for Real-Time Complex Flow Visualization In Vivo, IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, ISSN: 0885-3010, DOI: 10.1109/TUFFC.2019.2892731, Vol.66, No.4, pp.656-668, 2019

Abstract:
Complex flow patterns are prevalent in the vasculature, but they are difficult to image non-invasively in real-time. This paper presents the first real-time scanning platform for a high frame rate ultrasound technique called color encoded speckle imaging (CESI) and its use in visualizing arterial flow dynamics in-vivo. CESI works by simultaneously rendering flow speckles and color-coded flow velocity estimates on a time-resolved basis. Its live implementation was achieved by integrating a 192-channel programmable ultrasound front-end module, a 4.8 GB/s capacity data streaming link, and a series of computing kernels implemented on the graphical processing unit (GPU) for beamforming and Doppler processing. A slow-motion replay mode was also included to offer coherent visualization of CESI frames acquired at high frame rate (3,000 fps in our experiments). The live CESI scanning platform was found to be effective in facilitating real-time image guidance (at least 20 fps for live video display with 55 fps GPU processing throughout). In vivo pilot trials also showed that live CESI, when running in replay mode, can temporally resolve triphasic flow at the brachial bifurcation and can reveal flow dynamics in the brachial vein during a fist-clenching maneuver. Overall, live CESI has potential for use in routine investigations in-vivo that seek to identify complex flow dynamics in real-time and relate these dynamics to vascular physiology.

Keywords:
High frame rate ultrasound, Color encoded speckle imaging, Live scanning platform, Graphical processing units, In-vivo studies, Complex flow visualization

16.Steifer T., Lewandowski M., Ultrasound tissue characterization based on the Lempel–Ziv complexity with application to breast lesion classification, Biomedical Signal Processing and Control, ISSN: 1746-8094, DOI: 10.1016/j.bspc.2019.02.020, Vol.51, pp.235-242, 2019
Steifer T., Lewandowski M., Ultrasound tissue characterization based on the Lempel–Ziv complexity with application to breast lesion classification, Biomedical Signal Processing and Control, ISSN: 1746-8094, DOI: 10.1016/j.bspc.2019.02.020, Vol.51, pp.235-242, 2019

Abstract:
Building upon the recent successes in the application of information-theoretic concepts (e.g. Shannon entropy) in quantitative ultrasound, the authors propose a novel tissue characterization method based on the Lempel–Ziv complexity. In this procedure, standard ultrasound B-Mode images are mapped onto words over finite alphabets before the corresponding Lempel–Ziv complexity of ultrasound images is calculated. Such complexity metric may be used to differentiate between types of tissues. Here, the method is utilized as a binary classifier for the malignancy of breast lesions. The method is tested on OASBUD – an open-access breast lesions image database. Images of 48 malignant and 48 benign lesions were used – two images for each lesion. The new procedure slightly outperforms the state-of-art classifier based on pixel entropy as measured in the size of area under the receiver operating curve (ROC AUC), which suggests that it may serve as a basis for computer-assisted breast cancer ultrasound diagnosis and possibly in other standard applications of the quantitative ultrasound.

Keywords:
A method based on Lempel–Ziv complexity is proposed for quantitative ultrasound tissue characterization, The method is used to classify breast lesions from an open access ultrasound image database, The method performance is compared with entropy-based classifier as entropy is related theoretically to Lempel–Ziv complexity, The new method achieves 0.87 ROC AUC as compared to 0.84 achieved by the reference method

17.Jozwik P., Kopeć M., Polkowski W., Bojar Z., Dynamic deformation tests of ni3al based intermetallic alloy by using the split Hopkinson pressure bar technique, Journal of Mining and Metallurgy, Section B: Metallurgy, ISSN: 1450-5339, DOI: 10.2298/JMMB181113014J, Vol.55, No.1, pp.129-134, 2019
Jozwik P., Kopeć M., Polkowski W., Bojar Z., Dynamic deformation tests of ni3al based intermetallic alloy by using the split Hopkinson pressure bar technique, Journal of Mining and Metallurgy, Section B: Metallurgy, ISSN: 1450-5339, DOI: 10.2298/JMMB181113014J, Vol.55, No.1, pp.129-134, 2019

Abstract:
In this work, the Ni3Al-based intermetallic alloy was subjected to room temperature dynamic plastic deformation tests by using a split Hopkinson pressure bar technique. The dynamic compression processes were carried out at strain rates in the range of =(1.9×102 ÷ 1×104 s-1). A strong impact of applied deformation conditions on microstructure and mechanical properties evolution in the examined Ni3Al intermetallic, was documented. Generally, very high maximum compressive stress values were obtained, reaching 5500 MPa for the sample deformed at the highest strain rate (i.e. =1×104 s-1). The results of performed SEM/EBSD evaluation point towards an occurrence of dynamic recovery and recrystallization phenomena in Ni3Al samples deformed at high strain rates.

Keywords:
Ni3Al-based alloy, Split Hopkinson pressure bar, SEM/EBSD analysis

18.Kalociński D., Steifer T., On unstable and unoptimal prediction, MATHEMATICAL LOGIC QUARTERLY, ISSN: 1521-3870, DOI: 10.1002/malq.201800085, pp.1-10, 2019
Kalociński D., Steifer T., On unstable and unoptimal prediction, MATHEMATICAL LOGIC QUARTERLY, ISSN: 1521-3870, DOI: 10.1002/malq.201800085, pp.1-10, 2019

Abstract:
We consider the notion of prediction functions (or predictors) studied before in the context of randomness and stochasticity by Ko, and later by Ambos‐Spies and others. Predictor is a total computable function which tries to predict bits of some infinite binary sequence. The prediction error is defined as the limit of the number of incorrect answers divided by the number of answers given so far. We discuss indefiniteness of prediction errors for weak 1‐generics and show that this phenomenon affects certain c.e. sequences as well. On the other hand, a notion of optimal predictor is considered. It is shown that there is a sequence for which increasingly better predictors exist but for which no predictor is optimal.

19.Jenczyk P., Gawrońska M., Dera W., Chrzanowska-Giżyńska J., Denis P., Jarząbek D.M., Application of SiC particles coated with a protective Ni layer for production of Ni/SiC co-electrodeposited composite coatings with enhanced tribological properties, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2019.08.063, Vol.45, pp.23540-23547, 2019
Jenczyk P., Gawrońska M., Dera W., Chrzanowska-Giżyńska J., Denis P., Jarząbek D.M., Application of SiC particles coated with a protective Ni layer for production of Ni/SiC co-electrodeposited composite coatings with enhanced tribological properties, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2019.08.063, Vol.45, pp.23540-23547, 2019

Abstract:
In this paper, the mechanical properties of composites consisting of electroplated Ni and co-electrodeposited SiC particles, coated with a thin protective layer of Ni, were studied. The protective layer was on the SiC particles prior to adding them to the electrolyte bath. It was demonstrated that due to the application of the protective layer it was possible to decrease sliding friction force, and improve the wear resistance, of the composite coatings in comparison with standard electroplated composite coatings made of Ni and co-electrodeposited pure SiC particles. Coating SiC particles with Ni was achieved by means of a PVD process. The main advantage of this step is avoiding oxidation of the surface of the particles during the contact with an electrolyte. Particles protected from oxidation lead to stronger interfacial bonding between the matrix and the reinforcement. Furthermore, better bonding protects the SiC particles from being extracted from the matrix by a counter-probe during friction and wear tests. The influence of the particle's concentration is studied. A smaller friction force and constant wear rate was observed.

Keywords:
Wear, Friction, Interfacial bonding strength, Metal matrix composites, Silicon carbide, Electrodeposited nickel

20.Krysztofik J., Kukla D., Manaj W., Socha G., Evaluation of Damage Degree of Inconel 718 Alloy, Russian Journal of Nondestructive Testing, ISSN: 1061-8309, DOI: 10.1134/S1061830919040107, Vol.55, No.4, pp.299-307, 2019
Krysztofik J., Kukla D., Manaj W., Socha G., Evaluation of Damage Degree of Inconel 718 Alloy, Russian Journal of Nondestructive Testing, ISSN: 1061-8309, DOI: 10.1134/S1061830919040107, Vol.55, No.4, pp.299-307, 2019

Abstract:
The article presents results of the investigation of the quantitative evaluation of the degree of damage, described by the measure of accumulated plastic strain obtained in a static tensile test, using selected non-destructive techniques. Inconel 718 alloy was tested. The tests were conducted using a new type of specimens of variable cross-sectional area of measuring part. This provided a continuous distribution of plastic strain in the gage part of the specimen. The permanent deformation that varies along the sample axis enables an analysis of damage induced by a plastic deformation. The proposed method enables replacing the series of specimens by one sample. Degradation of the alloy corresponds with the changes of the electromagnetic properties of the material—the phase angle of the complex impedance of the eddy current, as well as with acoustics properties of material—acoustic birefringence of ultrasonic waves. It allows to determine the degree of damage of the material using noninvasive, non-destructive methods. Using the damage parameter proposed by Johnson it is possible to obtain the correlation between the non-destructive results and a damage degree of the material. The presented testing method delivers information about changes in the material structure caused by permanent deformation.

Keywords:
nondestructive testing, damage parameter, phase angle of eddy current, acoustic birefringence

21.Szymczak T., Makowska K., Kowalewski Z.L., Lasota P., An influence of impact energy on magnesium alloy behaviour, International Journal of Mechanics and Materials in Design, ISSN: 1569-1713, DOI: 10.1007/s10999-019-09461-1, Vol.0, pp.1-15, 2019
Szymczak T., Makowska K., Kowalewski Z.L., Lasota P., An influence of impact energy on magnesium alloy behaviour, International Journal of Mechanics and Materials in Design, ISSN: 1569-1713, DOI: 10.1007/s10999-019-09461-1, Vol.0, pp.1-15, 2019

Abstract:
The paper reports experimental results describing behaviour of the AM60 magnesium alloy under impact test. The material was examined at energy in the range from 170 to 690 J, using impact tower with the projectile of conical shape. Results are presented in a form of variations of accumulated energy, force, projectile velocity and its displacement versus time. The characteristic features appearing in courses of force and accumulated energy are illustrated. Fractography and microstructure of damage zones for distinguishing the alloy degradation are shown. The fracture regions of the material examined are represented by cracks and plug-shaped deformation.

Keywords:
Magnesium alloy, Impact, Projectile, Perforation, Fractography, Microstructure

22.Golasiński K., Pieczyska E., Maj M., Mackiewicz S., Staszczak M., Kowalewski Z., Urbański L., Zubko M., Takesue N., Anisotropy of Gum Metal analysed by ultrasonic measurement and digital image correlation, MATERIALS SCIENCE AND TECHNOLOGY, ISSN: 0267-0836, DOI: 10.1080/02670836.2019.1629539, pp.1-7, 2019
Golasiński K., Pieczyska E., Maj M., Mackiewicz S., Staszczak M., Kowalewski Z., Urbański L., Zubko M., Takesue N., Anisotropy of Gum Metal analysed by ultrasonic measurement and digital image correlation, MATERIALS SCIENCE AND TECHNOLOGY, ISSN: 0267-0836, DOI: 10.1080/02670836.2019.1629539, pp.1-7, 2019

Abstract:
The mechanical anisotropy of a multifunctional titanium alloy, Gum Metal, is investigated in this paper. The structural characterisation showed a strong <110> texture for Gum Metal, that is a result of the cold-swaging process applied during its manufacture. Gum Metal was treated as a transversally isotropic solid because of this texture. A significant difference from Young’s moduli of the alloy was detected from the ultrasonic measurement of parallel and perpendicular directions to the alloy swaging direction. Samples of Gum Metal cubes were compressed in two different orientations. During the deformation process, two perpendicular walls of each sample were monitored by two visible range cameras for further two-dimensional digital image correlation analysis, this confirmed a strong plastic anisotropy in Gum Metal.

Keywords:
Gum Metal, compression, mechanical anisotropy, digital image correlation, ultrasonic measurement, texture, titanium alloy, full-field deformation measurement

23.Glinicki M.A., Jóźwiak-Niedźwiedzka D., Antolik A., Dziedzic K., Gibas K., Podatność wybranych kruszyw ze skał osadowych na reakcję alkalia-kruszywo / Susceptibility of selected aggregates from sedimentary rocks to alkali-aggregate reaction, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.019.001, Vol.18, pp.5-24, 2019
Glinicki M.A., Jóźwiak-Niedźwiedzka D., Antolik A., Dziedzic K., Gibas K., Podatność wybranych kruszyw ze skał osadowych na reakcję alkalia-kruszywo / Susceptibility of selected aggregates from sedimentary rocks to alkali-aggregate reaction, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.019.001, Vol.18, pp.5-24, 2019

Abstract:
The paper presents the results of investigations into the reactivity of domestic aggregates produced from selected sedimentary rocks, carried out using the new testing methods, consistent with the RILEM and ASTM methods, implemented by GDDKiA (Polish General Directorate for National Roads and Motorways) documents. The range of the investigations covered coarse crushed aggregates produced from limestone, dolomite, sandstone and greywacke rocks, potentially suitable for making strong and durable concrete. No reactive forms of quartz were found in the mineralogical composition of the limestone aggregates and the dolomite aggregates. Micro- and cryptocrystalline quartz occurred in the particles of the greywacke aggregates and the sandstone aggregates. On the basis of the expansion of mortar and concrete specimens the aggregates produced from the sedimentary rocks were classified into the reactivity categories: R0, R1 and R2. A sodium-potassium-calcium silicate gel, whose composition (consistent with that reported in the literature) was characteristic of the alkali-silica reaction products, was found. The investigations resulted in a consistent assessment of the reactivity of the aggregates.

Keywords:
alkali-aggregate reaction, cement, concrete, dolomite aggregate, expansion, greywacke, limestone, quartz, reactive minerals, sandstone

24.Jóźwiak-Niedźwiedzka D., Antolik A., Dziedzic K., Glinicki M.A., Gibas K., Weryfikacja odporności wybranych kruszyw ze skał magmowych na reakcję z alkaliami / Resistance of selected aggregates from igneous rocks to alkali-silica reaction: verification, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.019.005, Vol.18, pp.67-83, 2019
Jóźwiak-Niedźwiedzka D., Antolik A., Dziedzic K., Glinicki M.A., Gibas K., Weryfikacja odporności wybranych kruszyw ze skał magmowych na reakcję z alkaliami / Resistance of selected aggregates from igneous rocks to alkali-silica reaction: verification, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.019.005, Vol.18, pp.67-83, 2019

Abstract:
The paper presents investigations into the reactivity of aggregates from igneous rock, carried out in accordance with the procedures contained in the GDDKiA General Technical Specification "Concrete pavements". The aim of the investigations was evaluation of the suitability of the aggregates for road structures and pavements built using cement based concrete technology. Aggregates produced from extrusive rocks (basalt, melaphyre and porphyry) and from intrusive rocks (granite and gabbro) were analysed. The mineral composition of the aggregates was evaluated with regard to their reactive SiO2 content. Expansion tests on mortar bar and concrete prism specimens with analysed aggregates and a microscopic analysis of the alkali-aggregate reaction products were carried out. A considerable amount of reactive minerals: chalcedony, tridymite and microcrystalline quartz and volcanic glass were found in the grains of the porphyry and melaphyre aggregates. On the basis of the conducted investigations the two aggregates made of igneous rocks (melaphyre and porphyry) were classified into category R1 (moderately reactive). The basalt aggregate, the granite aggregate and the gabbro aggregate were assigned to category R0 (non-reactive).

Keywords:
aggregate, alkali reactivity, alkali silica gel, cristobalite, igneous rocks, microcrystalline quartz, reactive minerals

25.Nowak Z., Nowak M., Pęcherski R.B., Wiśniewski K., Widłaszewski J., Kurp P., Computational modeling of thermoplastic behavior of inconel 718 in application to laser-assisted bending of thin-walled tubes, INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING, ISSN: 1543-1649, Vol.17, No.3, pp.317-338, 2019
Nowak Z., Nowak M., Pęcherski R.B., Wiśniewski K., Widłaszewski J., Kurp P., Computational modeling of thermoplastic behavior of inconel 718 in application to laser-assisted bending of thin-walled tubes, INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING, ISSN: 1543-1649, Vol.17, No.3, pp.317-338, 2019

Abstract:
Laser-assisted tube bending is a promising manufacturing process which enables production of forms and shapes that cannot be obtained by purely mechanical bending. It is particularly suitable for high hardness and brittle materials, such as nickel alloys, ceramics and cast iron. In the current paper, mechanical loading and simultaneous heating by a moving laser beam are used in a controlled manner to obtain the required deformation. Experimental investigation of the Inconel 718 (IN718) alloy provides the basis for identification of parameters of two constitutive models, which encompass softening phenomena and the coupling of temperature and strains. Numerical simulations are conducted to provide more insight into the laser-assisted bending process of the IN718 thin-walled tubes. Temperature, stress and deformation fields are determined in sequentially coupled thermomechanical analyses using the FE code ABAQUS. Laser beam is modeled as a surface heat flux using the dedicated DFLUX procedure. The temperature field is used as a thermal load in the static general step, together with an external mechanical load. The process of tube bending is controlled by the displacement of the piston rod of the actuator, while the thrust force is the resulting value.

Keywords:
laser-assisted bending of tubes, identification of material parameters, numerical simulations

26.Widłaszewski J., Nowak M., Nowak Z., Kurp P., LASER-ASSISTED THERMOMECHANICAL BENDING OF TUBE PROFILES, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126268, Vol.64, No.1, pp.421-430, 2019
Widłaszewski J., Nowak M., Nowak Z., Kurp P., LASER-ASSISTED THERMOMECHANICAL BENDING OF TUBE PROFILES, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126268, Vol.64, No.1, pp.421-430, 2019

Abstract:
The subject of the work is the analysis of thermomechanical bending process of a thin-walled tube made of X5CrNi18-10 stainless steel. The deformation is produced at elevated temperature generated with a laser beam in a specially designed experimental setup. The tube bending process consists of local heating of the tube by a moving laser beam and simultaneous kinematic enforcement of deformation with an actuator and a rotating bending arm. During experimental investigations, the resultant force of the actuator and temperature at the laser spot are recorded. In addition to experimental tests, the bending process of the tube was modelled using the finite element method in the ABAQUS program. For this purpose, the tube deformation process was divided into two sequentially coupled numerical simulations. The first one was the heat transfer analysis for a laser beam moving longitudinally over the tube surface. The second simulation described the process of mechanical bending with the time-varying temperature field obtained in the first simulation. The force and temperature recorded during experiments were used to verify the proposed numerical model. The final stress state and the deformation of the tube after the bending process were analyzed using the numerical solution. The results indicate that the proposed bending method can be successfully used in forming of the thin-walled profiles, in particular, when large bending angles and a small spring-back effect are of interest.

Keywords:
laser forming, laser-assisted bending, numerical modelling

27.Papliński P., Wańkowicz J., Ranachowski P., Ranachowski Z., Investigation of microstructure of ZnO varistors taken from surge arrester counters, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126237, Vol.64, No.1, pp.191-196, 2019
Papliński P., Wańkowicz J., Ranachowski P., Ranachowski Z., Investigation of microstructure of ZnO varistors taken from surge arrester counters, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126237, Vol.64, No.1, pp.191-196, 2019

Abstract:
The paper presents investigations of microstructure of varistors of damaged surge arrester counters. A similar ZnO varistor, not subjected before to operation, was a point of reference in this research. The results of investigations of the ZnO varistors show an untypical phase composition of their material, which was characterized by unsatisfying homogeneity and cohesion. The degradation processes of varistor material in the subsequent stages were recognized and described. A harmful impact of humidity inside the untight surge arrester counter on its operation and its ZnO varistors was proved. Some conclusions being the result of the operation checking of surge arrester counters were presented too.

Keywords:
surge arrester counter, ZnO varistors, microstructure of ceramics, ceramic material degradation