摘要
针对工程中运用到汽车尾气排放系统中的柔性连接波纹管疲劳破坏的问题,结合UG和Hyper Mesh建立有限元分析模型,利用模态叠加法在Nastran求解器中求得典型路谱外环坏路路谱六自由度随机载荷下的瞬态应力场,然后基于疲劳剪切试验下结构件的S-N曲线和n Code Design-life进行外环坏路路随机载荷下的疲劳损伤分析。分析及试验结果表明:文中的方法可以较准确地定位波纹管疲劳断位置,而且对疲劳损伤度的预测也较准确,验证了分析方法及S-N曲线的有效性,进而为工程上此类波纹管疲劳损伤计算与结构优化提供重要的参考,缩短波纹管的试验及研发周期。
Aiming at the fatigue fracture problem of flexible connecting bellows of automobile exhaust system applied in engineering, a finite element analysis model was established by combining UG with HyperMesh software. The transient stress field of a typical path spectrum-outer loop path spectrum under the 6-degree of freedom（DOF） random load was obtained by using the modal superposition method in the Nastran solver. Then the fatigue damage of the outer loop damaged path was analyzed under random load based on the S-N curve of the fatigue test of shearing and the nCode Design-life software. The analysis and experimental results indicate that the method can accurately locate the fatigue fracture point of bellows, and the fatigue life prediction is relatively accurate, verifying the validity of the analytical method and the S-N curve. The method proposed in this paper can further offer important references for fatigue damage calculation and structural optimization in engineering, which can shorten the test and development cycle of this series of bellows.
作者
周诚
洪亮
王升
ZHOU Cheng;HONG Liang;WANG Sheng(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Wuxi Xindebao Metal Hose Co.,Ltd.,Wuxi 214000,China)
出处
《应用科技》
CAS
2018年第4期137-141,146,共6页
Applied Science and Technology
