Ratcheting behavior of 90o elbow piping under seismic loading

Xiaohui Chen, Kaicheng Huang, Sheng Ye, Yuchen Fan and Zifeng Li

Abstract

Elastic-plastic behavior of nuclear power plant elbow piping under seismic loads has been conducted in this study. Finite element analyses are performed using classical Bilinear kinematic hardening model (BKIN) and Multilinear kinematic hardening model (MKIN) as well as a nonlinear kinematic hardening model (Chaboche model). The influence of internal pressure and seismic loading on ratcheting strain of elbow pipe is studied by means of the three models. The results found that the predicted results of Chaboche model is maximum, closely followed by the predicted results of MKIN model, and the minimum is the predicted results of BKIN model. Moreover, comparisons of analysis results for each plasticity model against predicted results for a equivalent cyclic loading elbow component and for a simplified piping system seismic test are presented in the paper.

Key Words

pressurized pipe; seismic loading; finite element analysis; constitutive model; ratcheting strain

Address

Xiaohui Chen: School of Control Engineering, Northeastern University, Qinhuangdao, 066004, China; School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China Kaicheng Huang, Sheng Ye: School of Control Engineering, Northeastern University, Qinhuangdao, 066004, China Yuchen Fan: School of Control Engineering, Northeastern University, Qinhuangdao, 066004, China; College of Energy Engineering, Zhejiang University, Zhejiang, 310058, China Zifeng Li: School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China

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