Partner: Leopold Kruszka

Military University of Technology (PL)

Doctoral thesis
1992Określenie pola temperatury i deformacji w procesie dynamicznego ściskania długich próbek aluminiowych w zakresie skończonych odkształceń lepkoplastycznych 
supervisor -- Prof. Wojciech Nowacki, PhD, DSc, IPPT PAN
482 
Recent publications
1.Moćko W., Kruszka L., Results of strain rate and temperature on mechanical properties of selected structural steels, Procedia Engineering, ISSN: 1877-7058, DOI: 10.1016/j.proeng.2013.04.100, Vol.57, pp.789-797, 2013
Abstract:

The article presents results of application of Rusinek-Klepaczko (RK) constitutive equation for the purposes of modelling of mechanical behaviour of four grades of structural steels. In order to calibrate the RK model a series of compression tests at wide range of strain rates were carried out using two testing stands: servo-hydraulic machine and split Hopkinson bar. The results were analysed to determine influence of temperature and strain rate on visco-plastic response of tested steels. It was concluded that at low temperatures the thermally activated mechanisms of plastic deformation results in the strong strain rate hardening effects, whereas at high temperatures they are limited.

Keywords:

Structural steels, Rusinek-Klepaczko constitutive model, Hopkinson bar, High strain rates

Affiliations:
Moćko W.-other affiliation
Kruszka L.-Military University of Technology (PL)
2.Ziółkowski A., Kruszka L., Podstawy teoretyczne testu prostego ścinania przy badaniu własności materiałów sprężystych poddanych dużym odkształceniom, BIULETYN WOJSKOWEJ AKADEMII TECHNICZNEJ, ISSN: 1234-5865, Vol.LIV, No.1, pp.1-16, 2005
Abstract:

W pracy wprowadzono podstawowe zależności teoretyczne umożliwiające poprawne opracowanie danych uzyskiwanych na drodze doświadczalnej w próbie prostego ścinania dla materiałów poddawanych dużym odkształceniom. Przedyskutowano uwarunkowania teoretyczno-doświadczalne próby, jak również wskazano pożądany kierunek dalszego jej udoskonalania.

Keywords:

proste ścinanie, duże odkształcenia, doświadczalne wyznaczanie własności materiałowych

Affiliations:
Ziółkowski A.-IPPT PAN
Kruszka L.-Military University of Technology (PL)
3.Kruszka L., Nowacki W.K., Oliferuk W., Badania dynamiczne materiałów kruchych na rozciąganie przy dużych prędkościach odkształcenia, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.34, pp.1-23, 1995
4.Kruszka L., Nowacki W.K., Wolna M., Statyczne i dynamiczne badania kruchego materiału elastooptycznego, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.3, pp.1-28, 1992

List of recent monographs
1.
90
Malinowski J.Z., Kowalewski Z.L., Kruszka L., Doświadczalna metoda oraz badania plastycznego płynięcia metali w zakresie bardzo wysokich prędkości odkształcenia, IPPT PAN, pp.1-88, 2007

Conference abstracts
1.Sadowski T., Postek E., Pietras D., Guhathakurta J., Kruszka L., Grążka M., Data-based micromechanical modelling of the dynamic response of interpenetrated composites, ICCS27 - 27th International Conference on Composite Structures, 2024-09-03/09-06, Ravenna (IT), No.1014, pp.130-130, 2024
2.Postek E., Pietras D., Guhathakurta J., Kruszka L., Grążka M., Sadowski T., Experimental testing and numerical modelling of impacts in interpenetrated composite, ICCSE3, 3rd International Conference on Computations for Science and Engineering, 2023-08-20/08-23, Neapol (IT), pp.19-20, 2023
Abstract:


The interpenetrating composites consist of a scaffold and metallic matrix, which fills it being introduced under pressure. The scaffold is usually crushable. In our case, the SiC material stands for the skeleton, while the AlSi12 alloy is the matrix. Both materials are crushable. The SiC phase is brittle throughout the loading process, but the AlSi12 alloy is brittle during the elastic phase; then, its behaviour becomes viscous-plastic. The presentation concerns the experimental testing and simulations of the impact and fragmentation of metal matrix composite - AlSi12/SiC. The numerical model of the internal structure is created based on CT scanning. The microstructure of the composite is complex and consists of a metallic phase (85%), ceramic SiC skeleton, porosity, and a system of not perfect interfaces. The impacts are realized in the following few scenarios. The exemplary scenario is realized by imposing the initial conditions on the sample that hits a hard elastic barrier. The second one corresponds to SHPB experiments. The last one is the hitting of an elastic impactor against the sample. The influence of the impact velocities and material parameters of the phases on the failure modes is observed. Previously, analyses of the modes of loading application on the micromechanical failure of metal matrix composite were analysed in [1, 2]. An analysis of the empty SiC scaffolds is presented in [3]. The proposed finite element model of the AlSi12/SiC composite behaviour describing gradual degradation under impact loading was tested for different scenarios of hitting. In all cases, the growth of damage in the composite is very realistic. These results lead to the conclusion the proposed finite element model is very effective.

Acknowledgement: The results presented in this paper were obtained within the framework of research grant No. 2019/33/B/ST8/01263 financed by the National Science Centre, Poland. The numerical analyses were done in the ICM UW in Warsaw and in CI TASK in Gdańsk, Poland.

References:
[1] Postek, E. and Sadowski, T. Distributed microcracking process of WC/Co cermet under dynamic impulse compressive loading. Compos. Struct. (2018) 194: 494-508.
[2] Postek, E. and Sadowski, T. Qualitative comparison of dynamic compressive pressure load and impact of WC/Co composite. Int. J. Refract. Hard. Met. (2018) 77: 68-81.
[3] Postek, E., Sadowski, T. and Bieniaś, J. Simulation of impact and fragmentation of SiC skeleton, Phys. Letters (2021) 24:578-587.

Keywords:

Cermets, Interpenetration, Impact, Viscoplasticity, Peridynamics

Affiliations:
Postek E.-IPPT PAN
Pietras D.-Lublin University of Technology (PL)
Guhathakurta J.-CT-LAB Stuttgart (DE)
Kruszka L.-Military University of Technology (PL)
Grążka M.-Military University of Technology (PL)
Sadowski T.-Lublin University of Technology (PL)
3.Postek E., Sadowski T., Kruszka L., Grążka M., Guhathakurta J., Fikus B., Numerical modelling and experimental observation of ballistic penetration process in two-phase metal/ceramic composites, ESMC 2022, 11th European Solid Mechanics Conference, 2022-07-04/07-08, Galway (IE), pp.1, 2022
Abstract:

Ceramic two-phases composites are used in such industries as the armaments industry, aviation, automotive, nuclear power, and space exploration. In several areas, they stand as the source of technological progress. The material is often subjected to extreme loads, such as variable dynamic loads and high temperatures. The paper presents experimental investigations of ballistic impact on ceramic /metal composites. The internal structure of the novel material consists of ceramic foam made of SiC and filled with Al alloy. The experiment was performed using the ballistic stand and spherical impactor of diameter 5 mm and mass 0.5 g. The impactor hit the sample of diameter 30 mm and thickness 4 mm with a velocity of 600 m/s. Fig. 1 presents crater after impact and defragmented sample. The numerical analysis of the fragmentation process was performed using the finite element method. The internal structure of the composite was assessed using micro-CT selecting both phases, i.e., ceramic foam and AL alloy. The phases are joined by a continuous very small thickness interface. The numerical calculations allow for the description of the whole degradation process of the analysed interpenetrating composite up to the final failure by fragmentation and confirm the novel applicability of the material as a protective layer against the high-velocity impact. Acknowledgement The work has been performed under the research grants 2019/33/B/ST8/01263, National Science Centre, Poland. The analyses were done in the ICM UW in Warsaw and in CI TASK in Gdańsk, Poland. References [1] T. Ohji and M. Singh, Engineered Ceramics: Current Status and Future Prospects: Wiley, 2015.

Keywords:

two-phase metal/ceramic composites, penetration experiments, numerical modelling

Affiliations:
Postek E.-IPPT PAN
Sadowski T.-Lublin University of Technology (PL)
Kruszka L.-Military University of Technology (PL)
Grążka M.-Military University of Technology (PL)
Guhathakurta J.-CT-LAB Stuttgart (DE)
Fikus B.-other affiliation
4.Sadowski T., Postek E., Pietras D., Gieleta R., Kruszka L., Non-linear dynamic and quasi-static responses of two-phase ceramic matrix and metal matrix composites subjected to compression and degradation, ICTAM2021, 25th International Congress of Theoretical and Applied Mechanics, 2021-08-22/08-27, Mediolan (virtual) (IT), pp.257-258, 2021
Abstract:

The paper presents modelling and experimental testing of non-linear degradation processes developing in the two-phase ceramic matrix (CMCs) and metal matrix composites (MMCs) subjected to quasi-static and dynamic compressive loading. Modelling was performed by a multiscale approach using both: (1) analytical and (2) numerical methods and selected Representative Volume Elements (RVE) based on SEM observations of composites. Both quasi-static and dynamic experimental tests were done applying standard MTS (100 kN) servo-hydraulic machine and Split Hopkinson Pressure Bar (SHPB) stand for impact tests with loading velocities 20 – 30 m/s. As a result, we observed for CMCs in quasi-static loading failure mode by splitting of cylindrical samples, whereas for impact loading dynamic crushing process took place.

Keywords:

metal-matrix composites, dynamic testing, Split Hopkinson Pressure Bar, peridynamics

Affiliations:
Sadowski T.-Lublin University of Technology (PL)
Postek E.-IPPT PAN
Pietras D.-Lublin University of Technology (PL)
Gieleta R.-other affiliation
Kruszka L.-Military University of Technology (PL)
5.Kruszka L., Moćko W., Cadoni E., Fenu L., Effect of fibre content on static and dynamic properties of fibre reinforced concrete, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.127-128, 2014
6.Kruszka L., Kowalewski Z.L., Moćko W., Grązka M., Experimental analysis of dynamic plastic behavior of materials by the Hopkinson bar technique, Plasticity 2013, 19th International Symposium on Plasticity and Its Current Applications, 2013-01-03/01-08, Nassau (BS), pp.190-192, 2013
Abstract:

In this paper original experimental methodologies of dynamic plastic behavior of various structural materials in a wide range of strain rates up to 10 5 s - 1, and at selected temperatures are presented. Identification of constitutive models and their verification are also included

Affiliations:
Kruszka L.-Military University of Technology (PL)
Kowalewski Z.L.-IPPT PAN
Moćko W.-other affiliation
Grązka M.-other affiliation