【摘要】 在小弹塑性变形条件下，首先将应力写成应变的奇次四项式的幂函数形式，使其相当精确地拟合材料的拉伸曲线．然后，应用线弹性轴对称圆柱壳的位移模态和一待定系数构成弹塑性壳的位移场．再应用最小势能原理确定该系数，从而得到封闭解．更多还原

【Abstract】 By using the odd function with four term polynomial, the curve of the stress-strain relation can be fitting precisely for various materials. Furthermore, the displacement modes of elastic axisymmetric cylindrical shells and the unknown coefficients are introduced to modify the elasto-plastic displacement field. According to the principle of minimum potential energy,the unknown coefficients as well as the closed solution can be determined.更多还原