基于Ansys的螺栓应力数值仿真及失效机理分析

Stress numerical simulation based on Ansys and failure mechanism analysis of bolt

针对某液氮输送管路低温工况下的螺栓断裂问题,首先进行了基于Ansys软件的应力仿真计算,对低温工况下螺栓的应力状态及分布等力学特性进行了分析。同时,采用宏观检测、微观检测和能谱分析、化学成分分析等方法,对螺栓断口进行了实效分析。结果表明,导致螺栓断裂的主要原因为应力腐蚀,断裂位置与Ansys仿真确定的最大应力区域相一致。

The stainless bolt fracture phenomena of the liquid nitrogen delivering system was analyzed with use of stress nu- merical simulation based on Ansys, which performed the analysis of bolt stress status along with distribution in cryogenic working condition. The bolt was also inspected by means of macroscopic examination, SEM, energy spectrum and chemical composition a- nalysis. The result shows that the crack is caused by stress corrosion. And the crack position is consistent with the maximum stress zone based on Ansys.