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

Rozprawa habilitacyjna
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
 

Kierownik projektów
1. Opracowanie metodyki identyfikacji wybranych właściwości mechanicznych metali za pomocą testu i nano i mikro-indentacji z uwzględnieniem anizotropii, Badania własne, Okres realizacji od 2011-06-02 do 2014-06-01, Finansowanie: NCN, N N501 0672 40

Ostatnie publikacje
1.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, pp.1-13, 2017
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, pp.1-13, 2017

Abstract:
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.

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

35p.
2.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
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

Abstract:
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.

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

35p.
3.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
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

Abstract:
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.

Keywords:
Copper, Single crystal, Nanoindentation, AFM, Size effect

30p.
4.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
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

Abstract:
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.

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

20p.
5.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
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

Abstract:
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.

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

40p.
6.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
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

Abstract:
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.

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

20p.
7.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
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

Abstract:
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.

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

35p.
8.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
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

Abstract:
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.

35p.
9.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
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

Abstract:
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.

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

35p.
10.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
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

Abstract:
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.

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

35p.
11.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
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

Abstract:
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.

Keywords:
laser ablation, ablation rate, carbon

30p.
12.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
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

Abstract:
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.

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

20p.
13.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
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

Abstract:
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.

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

20p.
14.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
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

Abstract:
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.

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

40p.
15.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
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

Abstract:
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.

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

5p.
16.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
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

Abstract:
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.

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

40p.
17.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
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

Abstract:
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.

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

15p.
18.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
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

Abstract:
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.



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

7p.
19.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
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

Abstract:
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.

Keywords:
Hydrostatic lubrication, Normal contact, Surface topography

32p.
20.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
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

Abstract:
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.

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

27p.
21.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
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

Abstract:
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.

Keywords:
stopy z pamięcią kształtu, implantacja jonowa, pseudospręzystość

9p.
22.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
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

Abstract:
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.

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

32p.
23.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, 20059p.
24.Kucharski S., Wpływ stanu warstwy wierzchniej na trwałość zmęczeniową elementu z karbem, PRZEGLĄD MECHANICZNY, ISSN: 0033-2259, Vol.3, pp.27-32, 20059p.

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, 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