保险阀连通管疲劳断裂分析及结构改进  

Fatigue Fracture Analysis and Structural Improvement of the Connecting Pipe of Safety Valve

作　　者：余锋 高健 武园浩 史刚 尹文辉 YU Feng;GAO Jian;WU Yuan-hao;SHI Gang;YIN Wen-hui(Beijing Institute of Astronautical Systems Engineering,Beijing Key Laboratory of Cryogenic Technology Research,Beijing,100076,China)

机构地区：[1]北京宇航系统工程研究所,深低温技术研究北京市重点实验室,北京100076

出　　处：《强度与环境》2020年第2期19-25,共7页Structure & Environment Engineering

基　　金：极端工况服役的运载火箭高性能阀门制造基础,联合基金项目(U1937602)。

摘　　要：应用疲劳分析理论以及有限元失效分析方法,对保险阀疲劳断裂问题进行机理分析,结果表明振动环境下连通管受双向弯曲应力影响,连通管焊接根部存在明显的应力集中,容易发生疲劳破坏。依据分析结果对连通管采取了支架/卡箍固定并改善连通管走向的改进措施,对改进结构保险阀连通管进行微应变及振动疲劳寿命测试,试验结果表明改进结构改善了连通管应力分布,连通管疲劳寿命提高了3倍以上。试验结果也验证了分析方法的正确性和可靠性,本文分析及试验方法对结构件动强度及疲劳寿命的设计和验证具有一定的参考价值。The fracture fault of the connecting pipe was analyzed using the fatigue life theory and the FEA. The results shown that the fatigue fracture of the connecting pipe resulted from the stress concentration in the weld root of connecting pipe. Based on the analysis result, the structure of the connecting pipe was improved by optimizing pipe trend and adding bracket and clamp and a test of micro-strain and fatigue life was carried out on the efficiency of the improved structure. The test results shown the improved structure was effectual and the fatigue life of the connecting pipe were increased by at least 3 times, which testified the correctness and the reliability of the analysis way in the text from another point of view. The analysis and test methods in this paper have certain reference value for the design and verification of dynamic strength and fatigue life of structural parts.

关 键 词：保险阀 断裂 有限元分析 疲劳寿命 连通管 

分 类 号：TH136[机械工程—机械制造及自动化]