Cumulation of a spherically converging shock wave in metals and its dependence on elastic-plastic properties,phase transitions, spall and shear fractures

摘要

Consideration is given to results of experimental and theoretical investigations how alpha-epsilon- phase transition in the unalloyed iron and the 30KhGSA steel and its absence in the austenitic 12Kh18N10T stainless steel influence processes under explosive deformation of spheres made of these materials. Polymorphous transition is shown to significantly effect on: -amount of explosion-products energy transferred to a sphere, -evolution of the converging-wave structure and its parameters, profiles of stress wave and temperature T(R,t) for some Lagrangian particles along the sphere radius, -character of energy cumulation under spherical convergence of waves.