考虑材料应变软化的非线性有限元的改进变Kp法

Improved variational K_p method of nonlinear FE considering strain-softening of material

针对变Kp法进行非线性有限元求解时,存在求解精度低和应变软化难以模拟的缺点,分析了变Kp法与增量法内在联系与区别,将初应力迭代法的基本思想引进到变Kp法,提出了改进变Kp法。不仅保持了原方法求解效率高的优点,而且可改善原方法求解精度,使该方法适用于材料应变软化的数值模拟。

To overcome the shortcomings of the low precision and the difficulty to simulate strain-softening in variational Kp method to be used to solve the non-linear FEM,an improved method in which the ideas of initial stiffness iteration method was introduced into variational Kp method was put forward based on the analysis of relation between the variational Kp method was forward based on the only keep the merits of high efficiency,but also improve the precision of solution,and may be used to simulate the material＇s strain-softening.