依据圆腔凹模中液压胀形件顶点材料的变形,是在其板面内的两个主应力同等作用下进行的。本文应用最近发展的塑性异性理论,建立了这两个主应力的差值的预测式。对几种金属板料的计算和实验验证表明,预测结果良好,精度是令人满意的。 According to the deformation of the vertex material of the hydraulic bulge in the circular cavity die, the two principal stresses in the plate surface are under the same action. In this paper, the recently developed theory of plastic heterosexuality is used to establish the prediction of the difference between these two principal stresses. The calculation and experimental verification of several kinds of metal sheets show that the prediction result is good and the accuracy is satisfactory.