大型结构件高应力区局部重分析

LOCAL REANALYSIS METHOD OF STRESS RAISERS IN LARGE SOLID STRUCTURES

为得到大型结构件局部高应力区域的应力分布，提出了一种新的应力重分析方法——有限元／改进边界元分步求解方法。推导了重分析模型边界条件计算公式及改进的边界积分求解式。对装载机动臂局部进行了重分析。

For stress raisers in large structure,a new stress reanalysis method FE/improved BE reanalysis method is proposed.It uses a coarse FE model to compute boundary conditions for a local reanalysis BE model.The computing method to determine boundary conditions for BE model is given.In BE reanalysis,the least square BEM is proposed and the least square boundary integral equations are derived.Taking the lifting arm of CAT980S loader as example,the stresses of local joint area are calculated and compared to the experimental results.