The permeability coefficient is dependent on the plastic shearing strain (ratio).
渗透系数依赖于塑性剪切应变(率)。
2
Uniaxial prestrain will obviously improve the forming limit on positive strainratio zone, while it has little effect on negative strainratio zone.
单拉预应变路径将显著提高正应变比区的成形极限，而对负应变比区的成形极限影响不大。
3
Equiaxial prestrain will obviously decrease the forming limit on positive strainratio zone, while it slightly improves the forming limit on negative strainratio zone.