Stress Relaxation In Specimens Research Articles

Effect of a pulsed electromagnetic field on stress relaxation in concentrator-containing flat specimens

Experimental results of evaluating the pulsed electromagnetic field effect on tensile stress relaxation in specimens with hole a concentrator are presented. The pulsed electromagnetic field is shown to induce local inelastic strain of a metal in the vicinity of the concentrator, which is greatly dependent on pulsed field parameters and concentrator sizes, determining the ratio of thermal-nonthermal current effects.

Finite element analysis of characteristics of residual strains in cross-sectional specimens of strained-layer materials

A procedure for modeling effects of surface stress relaxation in specimens processed from materials with residual strains was described at first, then the anisotropic finite element analysis was performed to study characteristics of strain relaxation in the cross-sectional specimens of strained-layer materials. By using the “element death” technique, the finite element model of the specimen was separated from the finite element model of the bulk material, and a free surface was created. As a result, effects of surface stress relaxation during processing specimens were conveniently modeled. The finite element results about strain relaxation in the cross-sectional specimens of GexSi1− x/Si superlattice were presented. Characteristics about the shear strain near the interface, the strain normal to the surface, and the strain normal to the interface were studied.