PREDICTION OF QUANTITATIVE DIFFERENCE BETWEEN THE TWO PRINCIPAL STRESSES AT THE POLE OF A BULGING SPECIMEN IN A DIE WITH CIRCULAR CAVITY
圆腔凹模液压胀形正交异性板试件顶点的主应力差的预测

According to the characteristics that the two principal stresses in plane at thepole of a bulging speciman in a die with circular cavity are playing equally important role inleading the deforming of material here,a method predicting the quantitative diffe