带缺陷管道塑性极限分析的一种迭代算法

An Effective Iterative Algorithm of the Upper Bound Limit Analysis with Slots Pipelines under Multi-loading Systems

摘要: 带体积型缺陷压力管道的塑性极限分析及相应的安全方法的研究, 是当前压力管道安全性分析中的前沿课题, 具有十分重要而广泛的应用前景。塑性极限分析在对带缺陷压力管道的完整性评价方面起着十分重要的作用, 它在结构完整性评价的双判据中是一个非常重要的参数。做为塑性力学的一个重要分支, 其分析结果可用来进一步挖掘材料的潜力, 并为压力管道的设计与安全评估提供有价值的指导。提出了一种使用三维理想刚塑性体极限上限分析的迭代算法。并以该算法分析了多组载荷作用下(弯矩、内压和轴力)凹坑缺陷对管道塑性极限上限的影响。分析结果对含体积型缺陷压力管道的完整性评估具有实际意义。

Abstract: In this paper, an effective iterative algorithm is used for the limit analysis of 3-D rigid-perfectly plastic bodies. A numerical path scheme for radial loading is adopted to deal with complex multi-loading system. The iterative algorithm has been applied to carry out the effects of slots on the upper bound limit loads of defective pipelines under multi-loading system, such as bending moment, internal pressure and axial tension. The research achievements are very useful to integrity assessment of defective pipelines.