THERMOPLASTIC ANALYSIS OF NORMAL IMPACT OF LONG CYLINDRICAL SPECIMEN: EXPERIMENT AND COMPARISON WITH THE NUMERICAL CALCULATION

The objective of this paper is to compare the temperature and the deformation fields in the cylindrical specimens (e.g., aluminum alloys), determined in the Taylor impact tests, with the numerical solutions. The temperature and deformation fields are caused by dynamic plastic deformation at high strain rates in the presence of finite strains. It is assumed that the process is locally adiabatic and associated with the axisymmetric deformations. Additionally, within the framework of Mandel's formalism, the general adiabatic plastic flow laws are derived for isotropic rate-dependent solids. They reduce to a simple form for the considered problem. The testing stand was based on the Hopkinson's pressure bar system and AGA thermovision set. The details of the experiment and the analysis of the experimental results are presented. The experimental results are compared with the numerical solutions.