Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


Dariusz Zasada

Ostatnie publikacje
1.  Kopeć M., Liu X., Gorniewicz D., Modrzejewski P., Zasada D., Jóźwiak S., Janiszewski J., Kowalewski Z.L., Mechanical response of 6061-T6 aluminium alloy subjected to dynamic testing at low temperature: Experiment and modelling, INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, ISSN: 0734-743X, DOI: 10.1016/j.ijimpeng.2023.104843, Vol.185, No.104843, pp.1-10, 2024

The aim of this research was to investigate an effect of low temperature on the mechanical properties and mi-crostructure of 6061-T6 aluminium alloy (AA6061-T6) subjected to dynamic loading. The specimens were subjected to dynamic compression at a low temperature of −80°C in a range of strain rates from 1.25 × 10 3 1/s to 3.4 × 10 3 1/s to compare their mechanical responses. The deformation mechanisms were analysed through EBSD observations during which dynamic recovery, was found as the dominant one. Furthermore, microstruc-tural analysis indicated that deformation under high strain rate conditions and temperature of-80°C enables to keep the constant initial grain size of the material after the loading applied. The material behaviour was modelled using mechanism-based viscoplastic constitutive equations. Furthermore, an accuracy of the developed model was validated by comparing it to experimental data. The set of constitutive equations proposed has been successful in modelling the stress-strain behaviour of the material for the range of strain rates and temperatures encountered in aluminium-forming processes under low-temperature conditions.

Słowa kluczowe:
Split Hopkinson pressure bar (SHPB),Low temperature,AA6061-T6,Microstructure

Afiliacje autorów:
Kopeć M. - IPPT PAN
Liu X. - Imperial College London (GB)
Gorniewicz D. - Military University of Technology (PL)
Modrzejewski P. - inna afiliacja
Zasada D. - inna afiliacja
Jóźwiak S. - Military University of Technology (PL)
Janiszewski J. - Military University of Technology (PL)
Kowalewski Z.L. - IPPT PAN
2.  Senderowski C., Panas A.J., Fikus B., Zasada D., Kopeć M., Korytchenko K.V., Effects of heat and momentum gain differentiation during gas detonation spraying of FeAl powder particles into the water, Materials, ISSN: 1996-1944, DOI: 10.3390/ma14237443, Vol.14, No.23, pp.7443-1-18, 2021

In this paper, dynamic interactions between the FeAl particles and the gaseous detonation stream during supersonic D-gun spraying (DGS) conditions into the water are discussed in detail. Analytical and numerical models for the prediction of momentum and complex heat exchange, that includes radiative effects of heat transfer between the FeAl particle and the D-gun barrel wall and phase transformations due to melting and evaporation of the FeAl phase, are analyzed. Phase transformations identified during the DGS process impose the limit of FeAl grain size, which is required to maintain a solid state of aggregation during a collision with the substrate material. The identification of the characteristic time values for particle acceleration in the supersonic gas detonation flux, their convective heating and heat diffusion enable to assess the aggregation state of FeAl particles sprayed into water under certain DGS conditions

Słowa kluczowe:
D-gun spraying, FeAl intermetallic powder, gas detonation flux, heat transfer, two-phase metallization stream, particle thermal history

Afiliacje autorów:
Senderowski C. - inna afiliacja
Panas A.J. - inna afiliacja
Fikus B. - inna afiliacja
Zasada D. - inna afiliacja
Kopeć M. - IPPT PAN
Korytchenko K.V. - inna afiliacja

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