What type of study is this?

This is a Quantitative Study study.

October 10, 2025

Influence of Triaxiality Factor on Low-Cycle Fatigue of Pipe Fittings

Puntos clave

Revising strain amplitude guidelines improves low-cycle fatigue predictions under dynamic loads.
Elastic-plastic analysis shows the influence of triaxiality factor on piping design during seismic events.
Current limitations in seismic design codes hinder practical implementation of the guidelines established by ASME.
Past studies highlight the need for more inclusive methods to evaluate structural integrity in seismic scenarios.

Resumen

Abstract In 2019, ASME Section III and JSME published a code case (ASME CC N-9001/JSME NC1 CC-0082) regarding seismic design codes for piping by using elastic-plastic analysis. As shown in PVP2023-1071703 “Seismic Design Method of Crossover Piping Across Building Isolation Boundary”, while it would be clear that this code case using elastic-plastic analysis allows for a reasonable seismic design of the piping, there are few examples of actual seismic design works by using this code case because of its conservatism on applicability limitations such as fabrication strain limitations, strain base criteria using triaxiality factor TF, and calculation method of applied strain. Therefore, we have discussed the technical issues to be addressed to revise ASME CC N-900 for actual piping design use. In this paper, we proposed the revisit results on allowable strain amplitude without TF against Reversing Dynamic Load (RDL), based on low-cycle fatigue testing and past studies on piping failure mode by Reversing Dynamic Load (RDL).

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Cite This Study

Shibukuwa et al. (Sun,) studied this question.

synapsesocial.com/papers/68e8619c7ef2f04ca37e4351 https://doi.org/https://doi.org/10.1115/pvp2025-152062

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