Near tip singular stress and strain fields of a mode I crack dynamically propagating in a power law compressible material under plane strains are considered.

Aim To determine numerically the field characteristics in the vied at the tip of a place crack growing steadily in a power-law hardening material.

Experimental verification on stress equation of slip line in plane strain for compressible materials;

This paper utilizes the common finite element software QFORM to simulate extrusion process for compressible materials, and discusses the influence of initial relative density to effective strain and extrusion forces as well as the influence of extrusion ratio to speed of densification and extrusion force.

According to the plastic equilibration equation and the theory of characteristic line, the stress equations of slip line in axial symmetry deformation on compressible materials were derived on basis of simplified yield criteria in this paper.

The paper adopted elastic-viscoplastic constitutive model,the stress and strain asymptotic fieldsnear anti-plane shear dynamic propagating crack-tip in power-law-viscoplastic medium are studied.