Elastic Stress Ratcheting Assessment Considering Secondary Stress Due to Structural Discontinuity Effect
Source abstract
Abstract
The partial secondary stress (hereinafter referred to as secondary mechanical membrane stress QL) generated by structural discontinuity effects is not considered by the current codes and standards and will lead to conservatism in stress analysis results. Two methods, called the translation method and the noncyclic method, are used in this paper to deduce the modified Bree ratcheting boundaries after separating QL and it presents the calculation formulas for the intersection coordinates between the modified Bree ratcheting boundaries and the corresponding modified 3S lines. Based on the modified elastic shakedown boundaries, two complete and feasible criteria for elastic ratcheting assessment are put forward, aiming to solve the unconservative issue of the 3S criterion when PL exists and the problem of excessive conservatism in assessment at structural discontinuities. Finally, a universal elastic stress ratcheting assessment method considering QL is proposed by integrating elastic ratcheting analysis, thermal stress ratcheting assessment, and simplified elastic–plastic analysis in ASME VIII-2, which significantly improves the economy and operability of the design at structural discontinuities.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · High Temperature Alloys and Creep
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Funding
Open Fund of State Key Laboratory
References (26)
Show source-provided references
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