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research-article

Thermal aging effect on the ratcheting behavior of pressurized elbow pipe

[+] Author and Article Information
Caiming Liu

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
550576246@qq.com

Dunji Yu

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
djyu@tju.edu.cn

Waseem Akram

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
waseem66@163.com

Xu Chen

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
xchen@tju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039073 History: Received October 05, 2017; Revised December 30, 2017

Abstract

In this study, the ratcheting behaviors of pressurized Z2CN18.10 austenitic stainless steel elbow pipe influenced by the thermal aging process were experimentally investigated in controlled constant internal pressure and reversed in-plane bending after different thermal aging periods (1000h and 2000h) at thermal aging temperature of 500oC. It is shown that the ratcheting behavior of pressured elbow pipe is highly affected by the thermal aging process. The evaluation of ratcheting behavior of pressured elbow pipe was performed using Chen-Jiao-Kim (CJK) kinematic hardening model as a user subroutine of ANSYS. The relationships of yield stress and multiaxial parameter with and thermal aging time were proposed. Ratcheting shakedown boundary of aged elbow pipe was evaluated by CJK model with thermal aging time.

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