dr hab. inż. Stanisław Kucharski

Zakład Mechaniki Materiałów (ZMM)
Pracownia Warstwy Wierzchniej (PWW)
stanowisko: profesor nadzwyczajny
telefon: (+48) 22 826 12 81 wew.: 141/464/465/466
pokój: 229/232/235/-21
e-mail: skuchar

Habilitacja
2004Identyfikacja własności i ewolucja stanu technologicznej warstwy wierzchniej elementów obciążonych monotonicznie i cyklicznie 
Promotor prac doktorskich
1.2011-03-31Levintant-Zayonts Neonila  Wpływ implantacji jonowej na własności materiałów z pamiecią kształtu typu NiTi640
 

Ostatnie publikacje
1.Zajączkowska U., Kucharski S., Nowak Z., Grabowska K., Morphometric and mechanical characteristics of Equisetum hyemale stem enhance its vibration, PLANTA, ISSN: 0032-0935, DOI: 10.1007/s00425-017-2648-1, Vol.245, No.4, pp.835-848, 2017

Streszczenie:

The order of the internodes, and their geometry and mechanical characteristics influence the capability of theEquisetumstem to vibrate, potentially stimulating spore liberation at the optimum stress setting along the stem.
Equisetum hyemale L. plants represent a special example of cellular solid construction with mechanical stability achieved by a high second moment of area and relatively high resistance against local buckling. We proposed the hypothesis that the order of E. hyemale L. stem internodes, their geometry and mechanical characteristics influence the capability of the stem to vibrate, stimulating spore liberation at the minimum stress setting value along the stem. An analysis of apex vibration was done based on videos presenting the behavior of an Equisetum clump filmed in a wind tunnel and also as a result of excitation by bending the stem by 20°. We compared these data with the vibrations of stems of the same size but deprived of the three topmost internodes. Also, we created a finite element model (FEM), upon which we have based the ‘natural’ stem vibration as a copy of the real object, ‘random’ with reshuffled internodes and ‘uniform’, created as one tube with the characters averaged from all internodes. The natural internode arrangement influences the frequency and amplitude of the apex vibration, maintaining an equal stress distribution in the stem, which may influence the capability for efficient spore spreading.

Słowa kluczowe:

Mechanical properties, Plant biomechanics, Segmented structure, Stem vibration, Stress distribution, Wind

Afiliacje autorów:

Zajączkowska U.-other affiliation
Kucharski S.-IPPT PAN
Nowak Z.-IPPT PAN
Grabowska K.-other affiliation
40p.
2.Petryk H., Stupkiewicz S., Kucharski S., On direct estimation of hardening exponent in crystal plasticity from the spherical indentation test, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, ISSN: 0020-7683, DOI: 10.1016/j.ijsolstr.2016.09.025, Vol.112, pp.209-221, 2017

Streszczenie:

A novel methodology is proposed for estimating the strain hardening exponent of a metal single crystal directly from the spherical indentation test, without the need of solving the relevant inverse problem. The attention is focused on anisotropic piling-up and sinking-in that occur simultaneously in different directions, in contrast to the standard case of axial symmetry for isotropic materials. To correlate surface topography parameters with the value of material hardening exponent, a finite-element study of spherical indentation has been performed within a selected penetration depth range using a finite-strain crystal plasticity model. It is shown how the power-law hardening exponent can be estimated from the measured pile-up/sink-in pattern around the residual impression after indentation in a (001)-oriented fcc single crystal of a small initial yield stress. For this purpose, a new parameter of surface topography is defined as the normalized material volume displaced around the nominal contact zone, calculated by integration of the local residual height (positive or negative) over a centered circular ring. That indicator can be easily determined from an experimental topography map available in a digital form. Comparison is made with the estimates based on measurements of the contact area and the slope of the load–penetration depth curve in logarithmic coordinates. The proposed methodology is extended to estimation of the hardening exponent simultaneously with the initial yield stress when the latter is not negligible. Experimental verification for a Cu single crystal leads to promising conclusions.

Słowa kluczowe:

Metal crystal, Elastoplasticity, Finite deformation, Strain hardening, Experimental identification

Afiliacje autorów:

Petryk H.-IPPT PAN
Stupkiewicz S.-IPPT PAN
Kucharski S.-IPPT PAN
35p.
3.Mackiewicz M., Mikulski J.L., Wańkowicz J., Kucharski S., Ranachowski P., Ranachowski Z., Study of composite insulator sheds subjected to wheel test, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2017-0101, Vol.62, No.2, pp.679-686, 2017

Streszczenie:

The paper presents investigation of the properties of the surface and the material stiffness – flexibility of series of samples taken from the sheds of the composite insulators. The insulators were previously subjected to wheel test. The wheel test and 1000 h salt fog test are regarded as alternative examination of the material resistance to the effects of electrical surface discharges. There were investigated two series of the samples of the composite insulators sheds. Examined specimens, made of HTV silicone rubber, were taken from the sheds of medium-voltage composite insulators of two different manufacturers. Insulators of both types passed the 1000 h salt fog test without reservation. Meanwhile, the wheel test can provide a basis for better distinguishing between physical properties of the tested materials. In the case of the insulators of one of the manufacturers the wheel test result was negative. Cross puncture effect of the sheds took place in several places. In addition, sheds were covered with dark coating of varying thicknesses. The results of the study indicated a significantly stronger influence of electrical and temperature factors on the sheds under investigations during the wheel test than in the case of the 1000 h salt fog test. It can be stated that these tests cannot be considered as alternative and it seems that wheel test enables better distinguishing between properties of the materials.

Słowa kluczowe:

composite insulators, silicone rubber, wheel test, electrical surface discharges, tracking and erosion

Afiliacje autorów:

Mackiewicz M.-other affiliation
Mikulski J.L.-other affiliation
Wańkowicz J.-other affiliation
Kucharski S.-IPPT PAN
Ranachowski P.-IPPT PAN
Ranachowski Z.-IPPT PAN
30p.
4.Kucharski S., Jarząbek D., Piątkowska A., Woźniacka S., Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-015-0105-2, Vol.56, No.3, pp.381-393, 2016

Streszczenie:

In the present study, we report a detailed investigation of the unusual size effect in single crystals. For the experiments we specified the hardness in single crystalline copper specimens with different orientations ((001), (011) and (111)) using Oliver-Pharr method. Our results indicates that with decreasing load, after the value of the hardness reached its maximum, it starts to decrease for very small indentation depths (<150 nm). For the sake of accuracy of hardness determination we have developed two AFM-based methods to evaluate contact area between tip and indented material. The proposed exact measurement of the contact area, which includes the effect of pile-up and sink-in patterns, can partially explain the strange behaviour, however, the decrease of hardness at low loads is still observed. At higher loads range the specified hardness is practically constant.

Słowa kluczowe:

Copper, Single crystal, Nanoindentation, AFM, Size effect

Afiliacje autorów:

Kucharski S.-IPPT PAN
Jarząbek D.-IPPT PAN
Piątkowska A.-Institute of Electronic Materials Technology (PL)
Woźniacka S.-IPPT PAN
35p.
5.Stupkiewicz S., Lengiewicz J., Sadowski P., Kucharski S., Finite deformation effects in soft elastohydrodynamic lubrication problems, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2015.03.016, Vol.93, pp.511-522, 2016

Streszczenie:

Soft elastohydrodynamic lubrication regime is typical for many elastomeric and biological contacts. As one or both contacting bodies are then highly compliant, relatively low contact pressures may lead to large deformations which are neglected in the classical EHL theory. In the paper, the related finite-deformation effects are studied for two representative soft-EHL problems. To this end, a fully-coupled nonlinear formulation has been developed which combines finite-strain elasticity for the solid and the Reynolds equation for the fluid, both treated using the finite element method with full account of all elastohydrodynamic couplings. Results of friction measurements are also reported and compared to theoretical predictions for lubricated contact of a rubber ball sliding against a steel disc under high loads.

Słowa kluczowe:

Soft-EHL problem, Finite deformation, Finite element method, Monolithic scheme

Afiliacje autorów:

Stupkiewicz S.-IPPT PAN
Lengiewicz J.-IPPT PAN
Sadowski P.-IPPT PAN
Kucharski S.-IPPT PAN
35p.
6.Mróz K.P., Kucharski S., Doliński K., Bigos A., Mikułowski G., Bełtowska-Lehman E., Nolbrzak P., Failure modes of coatings on steel substrate, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.1515/bpasts-2016-0027, Vol.64, No.1, pp.249-256, 2016

Streszczenie:

The critical monotonic strain of Ni-W and MoS2(Ti,W) coatings on steel substrates was studied. The idea of axisymmetric bending test (called here as coin bending test) limited to monitoring of the coating failure was used. Experiments revealed mechanism of the coating failure, as cracking initiated from coating surface defects and/or substrate was demonstrated using indentation technique. By pushing the center of the uncoated side of a circular plate, the axisymmetric stress state was generated in the coating. The stress components varied gradually from the greatest value in the center to the smallest value at the edge of the specimen. The changes of the sample surface as a result of loading were monitored step by step via optical microscopy.

Słowa kluczowe:

Ni-W coating, MoS2(Ti.W) coating, steel substrate, fracture, coatings strength, axisymmetric bending test

Afiliacje autorów:

Mróz K.P.-IPPT PAN
Kucharski S.-IPPT PAN
Doliński K.-IPPT PAN
Bigos A.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Mikułowski G.-IPPT PAN
Bełtowska-Lehman E.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Nolbrzak P.-Łódź Technical University (PL)
20p.
7.Zajączkowska U., Kucharski S., Guzek D., Are trichomes involved in the biomechanical systems of Cucurbita leaf petioles?, PLANTA, ISSN: 0032-0935, DOI: 10.1007/s00425-015-2388-z, Vol.242, No.6, pp.1453-1465, 2015

Streszczenie:

Main conclusion
Trichomes are involved in petiole movement and likely function as a part of the plant biomechanical system serving as an additional reservoir of hydrostatic pressure.

The large, non-glandular trichomes on Cucurbita petioles occur across collenchyma strands. Time-lapse imaging was used to study the leaf reorientation of Cucurbita maxima ‘Bambino’ plants placed in horizontal position. The experiment comprised four variants of the large non-glandular petiole trichomes: (1) intact, (2) mechanically removed, (3) dehydrated, and (4) intact but with longitudinally injured petioles. Isolated strands of collenchyma with intact epidermis or epidermis mechanically removed from the abaxial and adaxial sides of the petiole were subjected to breaking test. The stiffness of the non-isolated tissue with intact epidermis was measured using the micro-indentation method. Petioles without trichomes did not exhibit tropic response, and the dehydration of trichomes slowed and prevented complete leaf reorientation. Isolated strands of collenchyma showed no correlation between strength values and position on the petiole. However, strands of collenchyma with epidermis exhibited a significantly greater strength regardless of their position on the petiole. The indentation test showed that non-isolated collenchyma is stiffer on the abaxial side of the petiole. Trichomes from the abaxial side of the petiole were larger at their base. The application of the ‘tensile triangles method’ revealed that these trichomes had a biomechanically optimized shape in comparison to the adaxial side. We conclude that trichomes can be involved in plant biomechanical system and serve as an additional reservoir of hydrostatic pressure that is necessary for maintaining petioles in the prestressed state.

Słowa kluczowe:

Collenchyma, Epidermis, Plant biomechanics, Shape optimization, Tropic response

Afiliacje autorów:

Zajączkowska U.-other affiliation
Kucharski S.-IPPT PAN
Guzek D.-other affiliation
40p.
8.Takeda K., Matsui R., Tobushi H., Homma S., Levintant-Zayonts N., Kucharski S., Enhancement of bending fatigue life in TiNi shape-memory alloy tape by nitrogen ion implantation, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.67, No.4, pp.293-310, 2015

Streszczenie:

A shape-memory alloy (SMA) is expected to be applied as intelligent or smart material since it shows the functional characteristics of the shape memory effect and superelasticity. Most SMA elements, with these characteristics, perform cyclic motions. In these cases, the fatigue property of SMA is one of the most important issues in view of evaluating functional characteristics of SMA elements. The fatigue properties are complex since they depend on stress, strain, temperature and their hysteresis. If an SMA is implanted with high-energy ions, the thermomechanical properties of the material may change, resulting in long fatigue life. In the present study, the nitrogen ion implantation was applied to modify the surface of a TiNi SMA tape and the influence of implantation treatment on the bending fatigue properties was investigated.

Słowa kluczowe:

shape-memory alloy, titanium-nickel alloy, superelasticity, nitrogen ion implantation, fatigue, bending

Afiliacje autorów:

Takeda K.-Aichi Institute of Technology (JP)
Matsui R.-Aichi Institute of Technology (JP)
Tobushi H.-Aichi Institute of Technology (JP)
Homma S.-Nippon Trex Co. (JP)
Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
20p.
9.Kucharski S., Stupkiewicz S., Petryk H., Surface Pile-Up Patterns in Indentation Testing of Cu Single Crystals, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-014-9883-1, Vol.54, pp.957-969, 2014

Streszczenie:

Nano- and micro-indentation of Cu single crystals is performed in directions not aligned with crystallographic axes. Such tests correspond to mechanical characterization of incidentally oriented grains in a polycrystalline or composite material. Orientation and size dependence of complex patterns of surface piling-up and sinking-in around the imprint are investigated. Experimental observations are compared with finite element simulations based on the large deformation crystal plasticity theory.

Słowa kluczowe:

Copper, Nanoindentation, AFM, EBSD, Crystal plasticity, Finite element method

Afiliacje autorów:

Kucharski S.-IPPT PAN
Stupkiewicz S.-IPPT PAN
Petryk H.-IPPT PAN
35p.
10.Kucharski S., Jarząbek D., Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-014-2437-4, Vol.45A, pp.4997-5008, 2014

Streszczenie:

A study of the dependence of nanoindentation pile-up patterns on the indentation load and crystallographic orientation is presented. Three different orientations—(001), (011), and (111)—of single crystal copper were investigated. Experiments were conducted on a CSM ultra-nanoindentation tester using a Berkovich tip. The topographic images were obtained using an atomic force microscope. The evolution of pile-up patterns with different applied loads was observed. The results show that for applied loads equal to 0.45 mN and smaller the pile-up patterns do not depend on the crystallographic orientation of the indented surface; instead, they depend on the tip’s geometry. On the other hand, in the case of indentation loads bigger than 2 mN, pile-up patterns on the surfaces of (001)-, (011)-, and (111)-oriented single crystals have fourfold, twofold, and sixfold (or threefold) symmetry, respectively. An intermediate state was also reported. Furthermore, a detailed analysis of residual impressions with maximal applied loads equal to 2 mN and bigger reveals that both pile-up and sink-in patterns are present.

Afiliacje autorów:

Kucharski S.-IPPT PAN
Jarząbek D.-IPPT PAN
35p.
11.Kucharski S., Levintant-Zayonts N., Luckner J., Mechanical response of nitrogen ion implanted NiTi shape memory alloy, MATERIALS AND DESIGN, ISSN: 0261-3069, DOI: 10.1016/j.matdes.2013.11.056, Vol.56, pp.671-679, 2014

Streszczenie:

In the paper a change of material (mechanical) parameters of NiTi shape memory alloy subjected to ion implantation treatment is investigated. The spherical indentation tests in micro- and nano-scale and tension test have been performed to study an evolution of local superelastic effect in different volumes of nonimplanted and nitrogen ion implanted NiTi alloy. The differential scanning calorimetry has been applied to measure the change of characteristic temperatures due to ion implantation treatment. The structure of implanted material has been investigated using electron microscopy technique. It has been found that the ion implantation process changes the properties not only in a thin surface layer but also in bulk material. In the layer the pseudoelastic effect is destroyed, and in the substrate is preserved, however its parameters are changed. The characteristic phase transformation temperatures in substrate are also modified.

Słowa kluczowe:

Ion implantation, NiTi shape memory alloy, Micro- nano-indentation

Afiliacje autorów:

Kucharski S.-IPPT PAN
Levintant-Zayonts N.-IPPT PAN
Luckner J.-IPPT PAN
35p.
12.Kucharski S., Starzyński G., Study of contact of rough surfaces: Modeling and experiment, WEAR, ISSN: 0043-1648, DOI: 10.1016/j.wear.2014.01.009, Vol.311, pp.167-179, 2014

Streszczenie:

In the paper a problem of contact of rough surface with rigid flat plane is investigated experimentally and numerically. Samples made of three different steels with roughness constituted in a sand-blasting process were compressed in a special experimental setup. 3D surface topographies were measured in initial and deformed state using scanning profilometry. An experimental procedure has been designed that enables specifying load-approach and load-real contact area relations corresponding to plastic deformation of roughness zone. These relations were also simulated using a simple model based on statistical approach with special procedure proposed for a proper specification of sampling interval. The experimental and numerical results have been compared.

Słowa kluczowe:

Contact mechanics, Roughness, Real contact area, Asperity definition, Sampling interval

Afiliacje autorów:

Kucharski S.-IPPT PAN
Starzyński G.-IPPT PAN
35p.
13.Hoffman J., Chrzanowska J., Kucharski S., Mościcki T., Mihailescu I.N., Ristoscu C., Szymański Z., The effect of laser wavelength on the ablation rate of carbon, APPLIED PHYSICS A-MATERIALS SCIENCE AND PROCESSING, ISSN: 0947-8396, DOI: 10.1007/s00339-014-8506-0, Vol.117, pp.395-400, 2014

Streszczenie:

The ablation of graphite is studied as a function of laser fluence for 355, 532 and 1,064 nm wavelength generated by a nanosecond Nd:YAG laser. It has been found that in the case of lower wavelengths, the transition from the thermal ablation to the phase explosion takes place at lower laser fluences. The change of crater shape due to the effect of deep drilling in the proximity of the phase explosion threshold was observed. The calculations of plasma radiation flux to the target surface were made, and the considerable increase of absorbed energy density was found in the case of 355 nm wavelength.

Słowa kluczowe:

laser ablation, ablation rate, carbon

Afiliacje autorów:

Hoffman J.-IPPT PAN
Chrzanowska J.-IPPT PAN
Kucharski S.-IPPT PAN
Mościcki T.-IPPT PAN
Mihailescu I.N.-National Institute for Lasers, Plasma and Radiation Physics (RO)
Ristoscu C.-National Institute for Lasers, Plasma and Radiation Physics (RO)
Szymański Z.-IPPT PAN
30p.
14.Mróz K.P., Bigos A., Kucharski S., Doliński K., Bełtowska-Lehman E., Ni-W Electrodeposited Coatings on Low Carbon Steel Substrate: Fatigue Observations, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-014-1149-7, Vol.23, No.10, pp.3459-3466, 2014

Streszczenie:

The fatigue response of electrodeposited Ni-W on low carbon steel substrate was studied. The considered Ni-W coatings are a promising substitute for toxic hard chromium coatings which, according to EU directives (2000/53/WE, 2011/37/UE), must be eliminated. Specimens of pure substrate and those covered by coating were compared. Coated specimens exhibited lower fatigue resistance under higher stress amplitudes than their non-coated counterparts in stress-controlled fatigue experiments. However, at lower stress amplitudes, the fatigue strength of both specimen types was similar. The cyclic softening of the coatings was demonstrated using indentation techniques.

Słowa kluczowe:

fatigue, hardness, indentation, low carbon steel substrate, Ni-W coatings, S-N curve

Afiliacje autorów:

Mróz K.P.-IPPT PAN
Bigos A.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
Kucharski S.-IPPT PAN
Doliński K.-IPPT PAN
Bełtowska-Lehman E.-Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL)
20p.
15.Takeda K., Mitsui K., Tobushi H., Levintant-Zayonts N., Kucharski S., Influence of nitrogen ion implantation on deformation and fatigue properties of TiNi shape memory alloy wire, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.65, No.5, pp.391-405, 2013

Streszczenie:

A shape memory alloy (SMA) is expected to be applied as intelligent material since it shows the unique characteristics of the shape memory effect and superelasticity. Most SMA elements, with these characteristics, perform cyclic motions. In these cases, fatigue of SMA is one of the important properties in view of evaluating functional characteristics. The fatigue properties are complex since they depend on stress, strain, temperature and time. If SMA is implanted by high energy ions, the thermomechanical properties may change, resulting in long fatigue life. In the present study, the nitrogen ion implantation was applied to modify TiNi SMA wire surface and the influence of implantation treatment on the tensile deformation and bending fatigue properties was investigated.

Słowa kluczowe:

shape memory effect, titanium-nickel alloy, nitrogen ion implantation, superelasticity, fatigue

Afiliacje autorów:

Takeda K.-Aichi Institute of Technology (JP)
Mitsui K.-Masupuro Denkoh Corp. (JP)
Tobushi H.-Aichi Institute of Technology (JP)
Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
20p.
16.Páczelt I., Kucharski S., Mróz Z., The experimental and numerical analysis of quasi-steady wear processes for a sliding spherical indenter, WEAR, ISSN: 0043-1648, DOI: 10.1016/j.wear.2011.08.026, Vol.274-275, pp.127-148, 2012

Streszczenie:

The wear process on a frictional interface in a relative sliding motion of a punch on a substrate induces shape evolution of contact interface. For fixed contact zone the process tends to a steady state with fixed contact stress and strain distribution. Such steady state wear regimes were analyzed in the previous papers [1], [2], [3], [4] and [5] by applying the principle of minimum wear dissipation rate. However, when the contact zone evolves in time due to wear process, as in the case of sliding spherical indenter, a quasi-steady state is reached with stress intensity dependent on the contact size parameter. On the other hand, the contact pressure distribution satisfies the condition of steady state. The simplified numerical analysis of wear process is presented by applying the quasi-steady conditions. The numerical predictions are confronted with experimental test results for two specific cases of soft and hard substrates. The quantitative specification of wear parameters is provided, first assuming constant values throughout the whole wear process, next assuming linearly or exponentially varying during the initial period and tending to constant values.

Słowa kluczowe:

Spherical indenter, Sliding wear, Contact zone evolution, Wear parameters, Experimental data, Numerical simulation

Afiliacje autorów:

Páczelt I.-University of Miskolc (HU)
Kucharski S.-IPPT PAN
Mróz Z.-IPPT PAN
40p.
17.Piątkowska A., Kucharski S., Detekcja uszkodzeń pomiarem EA oraz metodami mikroskopowymi, PROBLEMY EKSPLOATACJI. MAINTENANCE PROBLEMS, ISSN: 1232-9312, Vol.84, No.1, pp.17-25, 2012

Streszczenie:

W pracy opisane zostały pomiary emisji akustycznej EA generowanych podczas badania mikrotwardości wgłębnikiem Vickersa, na próbkach krzemowej i stalowej 3 l6L z warstwą węglową. Otrzymane wyniki w postaci wykresów w dziedzinie czasu są porównywane z obserwacjami mikroskopowymi. Za pomocą analitycznego elektronowego mikroskopu skaningowego SEM zobrazowano powierzchnie odcisków, z uwidocznieniem powierzchniowych pęknięć i uszkodzeń. Odcisk mikrotwardości został przecięty z użyciem systemu FIB, zapewniającego odsłonięcie rzeczywistej struktury wewnętrznej materiału w otoczeniu odcisku. Wykonanie sekwencji przekrojów pozwoliło na zobrazowanie SEM przestrzenne uszkodzeń, zwłaszcza typu pęknięcia i rozwarstwienia, a także usytuowanie elementów warstwy wierzchniej i podłoża oraz zasięg odkształceń plastycznych. Zastosowanie obu metod pomiarowych: emisji akustycznej oraz obrazowania mikroskopowego, wzajemnie uzupełniających się, daje wnikliwą diagnostykę do analizy właściwości mechanicznych materiału.

Słowa kluczowe:

emisja akustyczna, badanie twardości, uszkodzenia, warstwa węglowa RF PACVD, FIB

Afiliacje autorów:

Piątkowska A.-Institute of Electronic Materials Technology (PL)
Kucharski S.-IPPT PAN
5p.
18.Kucharski S., Mróz Z., Identification of wear process parameters in reciprocating ball-on-disc tests, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2010.10.010, Vol.44, pp.154-164, 2011

Streszczenie:

Wear test results are presented for a spherical indenter in reciprocal motion interacting with soft (aluminium alloy) and hard (construction steel) substrates. The aim of this paper is to provide evidence of the evolution of the contact zone, specification of wear scar depth and surface roughness in the contact zone. Numerical analysis of the interaction of the sliding sphere with the wear track provided contact zone dimensions, although these differed from the experimental data. The incremental wear factor is also introduced in the paper, while the formulae for the wear volume of the sphere recommended by ASTM have been improved.

Słowa kluczowe:

Dry wear, Contact area, Wear factor, Finite element method

Afiliacje autorów:

Kucharski S.-IPPT PAN
Mróz Z.-IPPT PAN
40p.
19.Levintant-Zayonts N., Kucharski S., Influence of High Fluence Nitrogen Ion Implantation on Pseudoelastic Behaviour of NiTi Shape Memory Alloy, ACTA PHYSICA POLONICA A, ISSN: 0587-4246, Vol.120, No.1, pp.79-82, 2011

Streszczenie:

An attempt to evaluate mechanical properties changes (superelastic phenomena) in the shape memory NiTi alloy (austenitic form) due to ion implantation (N+, fluences of 1x10^17 and 4x10^18 cm-2 ) has been made. We applied the differential scanning calorimetry technique and spherical indentation (micro- and nanoindentation scale) test to study superelastic effect. The results of investigations of selected functional properties, i.e. characteristic temperatures, total and recovered penetration depth on the implanted and non-implanted NiTi samples are presented.

Słowa kluczowe:

superelastic phenomena, shape memory alloy, nitinol, nitrogen ion implantation

Afiliacje autorów:

Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
15p.
20.Levintant-Zayonts N., Kucharski S., Lokalny efekt pamięci kształtu w stopie NiTi przed i po implantacji jonowej, INŻYNIERIA MATERIAŁOWA, ISSN: 0208-6247, Vol.183, No.5, pp.855-861, 2011

Streszczenie:

W przedstawionej pracy zastosowano metodę implantacji jonowej (jako techniki konstytuowania warstw wierzchnich) do modyfikacji własności stopu z pamięcią kształtu (SMA-Shape Memory Alloy) NiTi (w postaci martenzytycznej). Przedmiotem badań było określenie zmian własności kompozytu „warstwa implantowana+rdzeń” (rys. 2) po implantacji azotem (1x1018j/cm2, 65keV) na stopie NiTi oraz określenie wpływu implantacji jonowej na własności lokalnego efektu pamięci kształtu (EPK). Przedstawiono badania wybranych charakterystyk funkcjonalnych: temperatur charakterystycznych implantowanego stopu NiTi, a także zmian trwałych odkształceń w zależności od temperatury. Wykorzystano test mikroindentacji i profilometrii skaningowej. Metodą transmisyjnej mikroskopii elektronowej (TEM) badano mikrostrukturę stopu NiTi, a pomiary RBS zastosowano do oszacowania profili rozkładów pierwiastków po implantacji jonowej. W pracy potwierdzono, że zachowanie materiału NiTi bardzo zależy od temperatury. Pokazano, również, że test wgniatania wgłębnika kulistego w powierzchnie może posłużyć do identyfikacji implantowanej warstwy.



Słowa kluczowe:

implantacja jonowa, efekt pamięci kształtu, stopy z pamięcią kształtu, indentacja

Afiliacje autorów:

Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
7p.
21.Kucharski S., Starzyński G., Bartoszewicz A., Prediction of surface roughness in metal forming with liquid lubricant, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2009.04.028, Vol.43, pp.29-39, 2010

Streszczenie:

In the paper an experimental study of compression of rough surface in the presence of lubricant and in dry state is presented. The evolution of roughness parameters was analyzed. In the lubrication conditions an existence of asymptotic state was observed where roughness parameters and real contact area stabilize due to hydrostatic response of lubricant. The simplified model was proposed allowing to predict the roughness parameters and real contact area of the deformed surface in the asymptotic state. The model is based on analysis of topography of the undeformed surface and compression of a singular lubricant pit. The analysis was performed both numerically and experimentally.

Słowa kluczowe:

Hydrostatic lubrication, Normal contact, Surface topography

Afiliacje autorów:

Kucharski S.-IPPT PAN
Starzyński G.-IPPT PAN
Bartoszewicz A.-IPPT PAN
32p.
22.Levintant-Zayonts N., Kucharski S., Surface characterization and wear behavior of ion implanted NiTi shape memory alloy, VACUUM, ISSN: 0042-207X, DOI: 10.1016/j.vacuum.2009.01.068, Vol.83, No.Supplement 1, pp.S220-S223, 2009

Streszczenie:

The aim of this study was investigation of changes in the modified near-surface layer on the NiTi shape memory alloy, caused by ion implantation as well as their influence on the mechanical and shape memory properties of this material. Surface of NiTi has been modified by nitrogen ion beam at several fluences 1 × 1017 cm−2, 1 × 1018 cm−2 and 2 × 1018 cm−2 at the energy 50 keV. The effect of implantation parameters on surface characteristics and wear properties was investigated using dry-sliding-wear test, depth sensing indentation test and scanning profilometry method. The experimental results have shown how the ion implantation treatment can change the original surface: reducing Ni content in the surface, increasing the surface hardness (furthermore, the hardness improvement extended to the regions much deeper than the implanted layer), and improving the sliding wear resistance. The experimental results of surface treatment conditions and mechanical properties of the modified NiTi alloys are compared, analyzed and discussed in this paper.

Słowa kluczowe:

Shape memory NiTi alloy, Ion implantation, Wear, Surface characterization

Afiliacje autorów:

Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
27p.
23.Levintant-Zayonts N., Kucharski S., Analiza zmian pseudosprężystych własności stopu NiTi z pamięcią kształtu spowodowanych implantacją jonową, INŻYNIERIA MATERIAŁOWA, ISSN: 0208-6247, Vol.1, pp.45-53, 2009

Streszczenie:

Stopy z osnową NiTi należą do grupy najlepszych materiałów z pamięcią kształtu [1]. Szeroki zakres zastosowań w medycynie i technice [2], [3], [4] powoduje zwiększenie roli stanu ich powierzchni. Zagadnienia modyfikacji powierzchni stopu NiTi w kontekście polepszenia jej charakterystyk – z jednej strony, i zachowania funkcjonalnych własności (efektu pamięci kształtu i pseudosprężystości) z drugiej strony, - stawiane są coraz częściej [6], [7]. W przedstawianej pracy jest pokazana próba oceny zmian własności mechanicznych stopu NiTi implantowanego azotem (zakres dawek 1x1017–3x1018j/cm2). Wykorzystano test mikroindentacji. Przedstawiono badania wybranych charakterystyk funkcjonalnych, głównie zmian odkształceń odzyskiwanych i trwałych, a także temperatur charakterystycznych implantowanego topu NiTi w warunkach pokojowej i podwyższonej temperatury.

Słowa kluczowe:

stopy z pamięcią kształtu, implantacja jonowa, pseudospręzystość

Afiliacje autorów:

Levintant-Zayonts N.-IPPT PAN
Kucharski S.-IPPT PAN
9p.
24.Kucharski S., Mróz Z., Identification of yield stress and plastic hardening parameters from a spherical indentation test, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, ISSN: 0020-7403, DOI: 10.1016/j.ijmecsci.2007.03.013, Vol.49, No.11, pp.1238-1250, 2007

Streszczenie:

Assuming plastic hardening of metals are specified by the stress–strain curve in the form View the MathML sourceσ=σ0+kεpm, the material parameters σ0, k and m are identified from spherical indentation tests by measuring compliance moduli in loading and unloading of the load–penetration curve. The curve P(hp) is analytically described by a two term expression, each with different exponents. Here, εp and hp denote the plastic strain and permanent penetration. The proposed identification method is illustrated by specific examples including numerical and physical identification tests.

Słowa kluczowe:

Spherical indentation test, Identification, Finite element modelling, Elasto-plastic material properties

Afiliacje autorów:

Kucharski S.-IPPT PAN
Mróz Z.-IPPT PAN
25.Kucharski S., Starzyński G., Symulacja wpływu nagniatania na ewolucję naprężeń i trwałość zmęczeniową elementu z warstwą wierzchnią, PRZEGLĄD MECHANICZNY, ISSN: 0033-2259, Vol.3, pp.23-27, 2005
26.Kucharski S., Wpływ stanu warstwy wierzchniej na trwałość zmęczeniową elementu z karbem, PRZEGLĄD MECHANICZNY, ISSN: 0033-2259, Vol.3, pp.27-32, 2005
27.Kucharski S., Mróz Z., Identification of material parameters by means of compliance moduli in spherical indentation test, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2004.03.030, Vol.379, No.1-2, pp.448-456, 2004

Streszczenie:

An identification method of elastic and plastic hardening parameters is proposed by measuring compliance moduli in loading and unloading in the spherical indentation test. The loading program is composed of consecutive loading and unloading steps from which the compliance moduli are determined from the load–penetration (P–h) curve. The hardening parameters k and m occurring in the plastic hardening curve Full-size image (<1 K) are then specified. Identification of materials described by a more complex three parameters constitutive law εp=((σ−σy)/k)′1/m′, where σy denotes the yield stress, is also analysed. The identification of Young’s modulus from the indentation test is also presented.

Słowa kluczowe:

Spherical indentation test, Identification, Elasto-plastic material properties, Indentation compliance moduli

Afiliacje autorów:

Kucharski S.-IPPT PAN
Mróz Z.-IPPT PAN
28.Kucharski S., Mróz Z., Identification of plastic hardening parameters of metals from spherical indentation tests, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/S0921-5093(01)01334-X, Vol.318, No.1-2, pp.65-76, 2001

Streszczenie:

Using the two-parameter power hardening rule σ=kεpm, the parameters k and m are identified from spherical indentation loading–unloading tests which account for the variation of the indentation profile during elastic unloading and sphere deformation. The predicted and measured stress–strain curves are compared for several materials. Both experimental and actual data for 18G2A low-alloy steel are used to assess the accuracy of the identification procedure. Finally, identification of the stress–strain curve of an aluminium alloy is demonstrated.

Słowa kluczowe:

Spherical indentation tests, Plastic, Low-alloy steel, Metals

Afiliacje autorów:

Kucharski S.-IPPT PAN
Mróz Z.-IPPT PAN

Abstrakty konferencyjne
1.Takeda K., Matsui R., Tobushi H., Levintant-Zayonts N., Kucharski S., Deformation and fatigue properties of nitrogen ion implanted TiNi shape memory alloy, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.269-270, 2014
2.Sadowski P., Kucharski S., Lengiewicz J., Stupkiewicz S., Soft elastohydrodynamic lubrication problems in the finite deformation regime: experimental testing and modelling, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.323-324, 2014
3.Maździarz M., Nalepka K.T., Szymański Z., Hoffman J., Kret S., Kucharski S., Nalepka P., Atomistic Model of Decohesion of Copper-Corundum Interface, SolMech 2012, 38th Solid Mechanics Conference, 2012-08-27/08-31, Warszawa (PL), pp.204-205, 2012