弹塑性有限元分析的一种修正方法

Modified Method for General Elastic-Plastic Finite Element Analysis Method

针对目前弹塑性有限元分析方法中存在的等效应力偏离屈服面的应力漂移问题． 提出了一个修正方法．简述了采用通常的方法产生应力漂移现象的原因（误差累 计的结果），提出了一个消除累计误差的方法，在不增加计算量及复杂性的情况 下，较好地解决了这一问题。用该方法编制了相应的程序．计算了一些算例，并且与 通常的方法的计算结果进行了比较。理论分析和数值结果都充分说明了本方法的有效性。

This paper presents a modified method for solving the problem of the equivalent stress deviating far from the yield surface (stress drift) by using the general elastic-plastic finite element analysis method .The paper simply describes that the reason of stress drift results from error accumulation .This new method presented in this paper has efficiently solved the stress drift problem under the condition of the calculation amount and the calculation complexity not being added. A computer code is programmed by the new method and some examples are computed and the results obtained by the method are compared with those of the general method The effectiveness of the method is thoroughly shown by the theoretical analysis and the numerical results.