Dynamic shear band development in dipolar thermoviscoplastic materials

摘要: We study thermomechanical deformations of a viscoplastic body deformed in plane strain compression at nominal strain-rate 5000 sec-1. develop material model which the second order gradients velocity field are also included as kinematic variables and propose constitutive relations for corresponding higher stresses. This introduces characteristic length l, addition to viscous thermal lengths, into theory. It is shown that computed results become mesh independent l greater than certain value. Also, consideration has stabilizing effect sense initiation shear bands delayed their growth slower compared nonpolar (l=0) materials.