Strain field evolution on the surface of aluminum sheet alloys exposed to specific impact with oscillation loading

Abstract

Strain field evolution on the surface of aluminum sheet D16 and 2024-T3 alloys has been analyzed during static deformation and during specific high-speed impact and oscillation loading-dynamical non-equilibrium process. Experiments have been conducted using an original mechanical testing technique and a specially developed software solution for noncontact study of strain field using digital image correlation fitted with a high-speed camera. It has been established that deformation process kinetics for tested aluminum alloys after a dynamical non-equilibrium process during further static deformation changes as compared with a process of static deformation mainly manifests itself in the increase in general alloy ductility and delay in ''neck formation.'' It has been shown that strain field is an important indicator for deformation band structure formation in the tested materials.

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.…”

“…However, shear strains in structural elements of the material are accompanied by changes in volume and depend on the DNP conditions. Thus, a dissipative structure is formed due to the impulse injection of energy; moreover, the greatest part of the material within this new structure is subjected to the intensive compression (Chausov et al 2015a). Most sensitive to such structural reconstructions of the material are the thermal capacity and the electrical resistance of the material (Omari, Sevostianov 2013;Sevostianov et al 2010).…”

“…Fig. 10 presents the results of the width measurements of specimens from the aluminum alloy 2024-T3 studied under different test patterns (Chausov et al 2015a). …”

“…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).…”

Modification of Mechanical Properties of High-Strength Titanium Alloys VT23 and VT23M Due to Impact-Oscillatory Loading

“…Here, we should highlight the promising methods associated with the influence of different energy Metals 2019, 9,80 2 of 18 fields, such as electromagnetic, ultrasonic, and force fields, which realize the chaotic dynamics in materials [11][12][13]. Chausov et al were the first to propose and test a simple and effective method for realizing DNP by applying additional impulse loading on materials of different classes [14][15][16]. Metallophysical experiments helped to reveal [17][18][19] that under impact-oscillatory loading, due to the pulsed introduction of energy into aluminum alloys, armco-iron, and stainless steel, there occur self-organizing processes in materials with the formation of new spatial dissipative structures, which are connected at different scale levels and look like adiabatic bands of shear.…”