有限元法
结构工程
断裂力学
计算机模拟
张力(地质)
离心泵
巴黎法
机械
裂缝闭合
涡轮机
工程类
材料科学
叶轮
机械工程
模拟
复合材料
物理
极限抗拉强度
作者
Jiayao Chen,Yukun Cui,Y Zheng,Yuquan Zhang
标识
DOI:10.1080/15376494.2023.2202653
摘要
The performance evaluation of fatigue crack propagation is essential for the safe and stable operation of power plants. In this study, the Walker equation is employed, considering the loading ratio effect. The parameters in the Walker equation for AISI 304 L are fitted by a normal probability distribution based on the experimental information . A numerical simulation of the fatigue crack growth is carried out using the extended finite element method with the Walker equation embended in, and verified on a round compact tension model with the loading ratios of R = 0.1, 0.5, and 0.85. Finally, a fatigue crack growth simulation of a vertical centrifugal pump-turbine runner under turbine conditions is conducted with two crack positions. The crack morphology can be captured together with the corresponding fatigue life by using the developed fatigue crack propagation simulation method based on the extended finite element method. The numerical results can be used as guidance for improving the maintenance plan of pump plants.
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