此文针对塑性成形有限元分析大增量加载的收敛性困难，推导了用于板料成形弹塑性有限元分析的牛顿一致迭代公式。
In this paper, facing the convergent problem of plastic forming using large incremental step, we deduced the iterative formula used in analysis of elastic-plastic plate forming finite element method.
实现了两种求解非线性问题的数值计算方法：改进欧拉法和增量牛顿迭代法。
Two calculational methods for nonlinear analysis are adopted, that is, the improved Euler method and the Newton iteration method.
非线性方程采用位移引导或弧长引导的牛顿-拉夫森增量迭代法求解。
Newton Raphson method is used to solve the non linear equations piloted in displacements or in arc length.
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