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research-article

Evaluation of simplified creep design methods based on the case analysis of tee joint at elevated temperature

[+] Author and Article Information
Jian-Guo Gong

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
jggong@ecust.edu.cn

Qiwei Xia

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
xia_qiwei@163.com

Fu-Zhen Xuan

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
fzxuan@ecust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4036533 History: Received December 23, 2016; Revised April 14, 2017

Abstract

Based on a tee joint, the simplified creep design methods of ASME code, elastic-perfectly plastic (EPP) analysis of Code Case N-861 (CC N-861) and the inelastic analysis by isochronous stress strain (ISS) curve were evaluated and compared to nonlinear finite element creep analysis (FECA). Results indicated that both EPP and FECA lead to the greater inelastic strain than ISS curve-based results. By contrast, the ISS-based analysis induces a smaller usage fraction (damage) than FECA due to the underestimated inelastic strain. In addition, the smallest usage fraction (damage) is obtained by using EPP analysis for which the remarkable bending strain is involved.

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