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This is a Experimental Study study.

October 10, 2025

Suitably Accounting for Mean Stress Effects in Pseudo-Stress-Based Design Fatigue Curves

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Authors

CCChris CurrieRolls-Royce (United Kingdom)AMAndrew MorleyRolls-Royce (United States)AMAlec McLennanUniversity of Liverpool

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Implication

This analysis presents new methods for calculating design fatigue curves in nuclear pressure vessels, addressing the impact of mean stress on fatigue life.

Key Points

Fatigue life is significantly affected by the presence of mean stress, especially tensile mean stress.
Existing ASME fatigue curves utilize the Modified Goodman correction, which may lead to non-conservative design estimates.
Recent testing identified substantial conservatism within transference factors, prompting a need for a robust mean stress correction approach.
Two new methods for design fatigue curve derivation are presented, focusing on addressing mean stress issues in a pragmatic manner.

Cite This Study

Currie et al. (2025) studied this question.

synapsesocial.com/papers/68e8619c7ef2f04ca37e4440 https://doi.org/10.1115/pvp2025-154711

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Implication

This analysis presents new methods for calculating design fatigue curves in nuclear pressure vessels, addressing the impact of mean stress on fatigue life.

Suitably Accounting for Mean Stress Effects in Pseudo-Stress-Based Design Fatigue Curves

Discussion

Member takes

Implication

Key Points

Cite This Study

Suitably Accounting for Mean Stress Effects in Pseudo-Stress-Based Design Fatigue Curves

Discussion

Member takes

Implication

Key Points

Cite This Study

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