【摘要】 在小弹塑性变形范围内，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神曲线．然后．用弹性板的位移模态和一待定系数构成板的弹塑性位移场．用最小势能原理确定该系数．从而得到板的封闭解．更多还原

【Abstract】 The stress-strain relationship is written first as a homogenens power funetion with four terms, in order to fit the stress-strain curse of materials precisely in the range of small elas to-plastic deformation. Then. the displacement modes of elastic plates and an undeterminedcoefficient are introduced to form the elasto-plastic displacement field. Based on the principleof minimun potential energy. this coefficient is determined and the closed solution can be obtained.更多还原