In this paper, we consider the invariant plane for homogenecus vector field Q(x) of degree two in R3, and obtain the necessary and sufficient condition that Q(x) has invariant plane through the origin.

Effect of principal stress ratio in plane strain condition on void damage evolution;

The bifurcation analysis of shear band of rock under the plane strain condition;

Analysis of shear strength of unsaturated expensive soil under plane strain test;

Influence of loading direction and strain rate on twinning of AZ31 magnesium alloy in plane-strain compression;

In spite of assumptions of plane-strain, the friction at the roll-workpiece is presumed as viscosity, this paper calculated the unit pressure and rolling-force of flat-rolling process by rigid-plastic BEM, and compared results with the results of experiment and FEM.

The compression experiment for five aluminium alloys is made by self-made plain strain compress instrument, the flow stress is measured under cold defromation, which ef-fact on flow stress is descussed.

According to that self-bearing capacity is the key to surrounding rock stability, plain strain experiments are carried out on the analysis of in-situ measured data, and the relationship between volume expansion ratio and self-bearing capacity is presented, which is meaningful in underground engineering.

According to that self-bearing capacity is the key of surrounding rock stability, plain strain experiments are carried out on the basis of the analysis of in-situ measured data, and the relationship between volume expansion ratio and self-bearing capacity is presented, which is meaningful in underground engineering.