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本文提出预测—校正迭代方法,使边界元初应变法的弹塑性分析可以适用于包括非强化材料在内的各种塑性流变特性的材料。其原理为利用结构因子,即内部单元对其初应变的弹性响应来校正每步增量载荷作用下预测的塑性应变增量,使塑性区的等效应力逐步返回到屈服面上,在中型计算机上对均匀拉伸的双V缺口平板按理想弹塑性材料进行了弹塑性分析,计算结果与有限元法的结果十分一致。但计算时间大为缩短。
In this paper, the prediction-correction iterative method is proposed to make the elasto-plastic analysis of the boundary element element strain method applicable to various plastic rheological properties including non-reinforced materials. The principle is to use the structural factor, ie the elastic response of the internal unit to its initial strain, to correct the predicted plastic strain increment under each incremental load, so that the equivalent stress in the plastic zone is gradually returned to the yield surface, in the medium-sized computer. The elasto-plastic analysis of the uniformly stretched double V-notch plate is performed on the ideal elastic-plastic material. The calculated results are in good agreement with the results of the finite element method. However, the calculation time is greatly reduced.