Finite element analysis on ratcheting strain distribution for pressurized 90°-elbows under cyclic bending
Ratcheting behavior of a 90°-elbow pipe of Z2CND18.12N austenitic stainless steel was experimentally investigated under constant internal pressure and cyclic bending. The results indicate that the hoop ratcheting strain at intrados and flank position was much larger than that at other positions. Then the widely used plasticity constitutive model-Chaboche model was employed to simulate the experimental results by finite element analysis (FEA) on the ratcheting strain distribution of the elbow via ANSYS software. The simulated results generally agreed well with the test results. Moreover, the influence of wall thickness and element type was discussed by considering two sets of elbow wall thickness and two types of elements, respectively. The wall thickness sets included the real dimension obtained by cutting open the elbow after the test. Solid and shell type elements were used for different types of wallthickness entity models. Compared with the real-dimension-thickness entity model, the equal-wall-thickness one yielded over prediction of ratcheting strain. Although the application of shell element could be less time-consuming, its predicted results seemed to be more conservative, due to the fact that the model of shell elements yielded higher ratcheting strain than that of solid elements.
Pressurized elbow Reversed in-plane bending Ratcheting strain Cyclic plasticity model
Xiaohui Chen Xu Chen
School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
国际会议
2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011
合肥
英文
51-55
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）