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 indicate that both EPP and FECA lead to a 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 of CC N-861 in which case the remarkable bending strain is involved.
Evaluation of Simplified Creep Design Methods Based on the Case Analysis of Tee Joint at Elevated Temperature
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 23, 2016; final manuscript received April 14, 2017; published online June 1, 2017. Assoc. Editor: Haofeng Chen.
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Gong, J., Xia, Q., and Xuan, F. (June 1, 2017). "Evaluation of Simplified Creep Design Methods Based on the Case Analysis of Tee Joint at Elevated Temperature." ASME. J. Pressure Vessel Technol. August 2017; 139(4): 041412. https://doi.org/10.1115/1.4036533
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