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Modification of the Findley Damage Parameter for Fatigue Assessment under multi-axial proportional and non-proportional variable Amplitude Loading

Fatigue life evaluation of components in engineering structures is crucial for ensuring their long-term reliability and safety. As operational loads can be arbitrary, including multi-axiality and variable amplitudes, fatigue life assessment approaches able to evaluate these are needed. This study presents a modification to the Findley damage parameter for assessing fatigue life under multi-axial variable amplitude loading, including both proportional and non-proportional loading conditions. The Findley damage parameter is adapted to explicitly account for mean stresses at different loading ratios.

The proposed modification integrates the mean stress sensitivity of the materials into the damage parameter. Additionally, the non-proportionality of the loads is taken into account…

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Fatigue life evaluation of components in engineering structures is crucial for ensuring their long-term reliability and safety. As operational loads can be arbitrary, including multi-axiality and variable amplitudes, fatigue life assessment approaches able to evaluate these are needed. This study presents a modification to the Findley damage parameter for assessing fatigue life under multi-axial variable amplitude loading, including both proportional and non-proportional loading conditions. The Findley damage parameter is adapted to explicitly account for mean stresses at different loading ratios.

The proposed modification integrates the mean stress sensitivity of the materials into the damage parameter. Additionally, the non-proportionality of the loads is taken into account by the non-proportionality factor as proposed by Gaier. A set of fatigue data from component testing under variable amplitude loading is utilised to validate the modified parameter’s accuracy. The parameter is used with the critical plane approach and the results are compared to the experimental database.

Reference
VAL5-2024-021

Title
Modification of the Findley Damage Parameter for Fatigue Assessment under multi-axial proportional and non-proportional variable Amplitude Loading
Author(s)
C. Fällgren, M. Vormwald
DOI
10.48447/VAL5-2024-021
Event
VAL5 - Fifth International Conference on Material and Component Performance under Variable Amplitude Loading
Year of publication
2024
Publication type
conference paper (PDF)
Language
English
Keywords
fatigue,Findley parameter,non-proportional loading,multi-axial loading,critical plane method