Peculiarities of structural transformation in plastic materials under abrupt changes in loading conditions

Influence of dynamic non-equilibrium processes on strength and plasticity of materials of transportation systems

“…As it was shown earlier (Zasimchuk et al 2009;Chausov et al 2015a), under additional force impulse loading of materials, with the preset speed and frequency of loading (in particular, the preset range of loading is 1-60 1/sec, and the preset range of loading frequencies is 1-2 kHz), structural reorganization begins in materials, which is due to variation of the energy exchange mode in the medium, when the medium absorbs the impulse brought by the impulse wave, but has not enough time to pass it directly to the microscopic level and transform heat energy.…”

“…In the course of previous investigations of specimens from alloy 2024-T3 (Zasimchuk et al 2009), the deformation of alloys 2024-T3 and D16 was found to be similar under the DNP. Let us consider the effect of different test patterns on the regularities in the deformation of alloy 2024-T3 (Fig.…”

“…8). This can be associated with certain structural damage of the alloy and relevant residual increase in the volume after fragmentation (Zasimchuk et al 2009;Hutsaylyuk et al 2014). Individual investigations into fracture surfaces of the alloy under different test patterns confirm that, in the case of formation of dissipative structures, the metal becomes non-uniform, i.e.…”

“…In this case, a decrease in strength of the alloy 2024-T3 is not observed. The fact that an increase in the material plasticity after the DNP implementation is associated with the structural self-organization was time and again proved by the authors using direct physical methods of research (Zasimchuk et al 2009;Hutsaylyuk et al 2013Hutsaylyuk et al , 2014Chausov et al 2015bChausov et al , 2012. In case of the DNP implementation in the plastic area of the material deformation, self-organization occurs in the form of newly formed finely banded structures interconnected at different structural levels.…”

“…One of them is the modification of their properties using additional force impulse loading, and the implementation of Dynamic Non-equilibrium Processes (DNP) (Zasimchuk et al 2009;Chausov et al 2015a).…”