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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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Description

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

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Author(s): P. Schwarz, P. Häfele, T. Langlois

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Editor(s): A. Esderts, S. Werdin, C. Bleicher

VAL5 Fifth International Conference on Material and Component Performance under Variable Amplitude Loading

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Author(s): P.M. Kyaw, M. Braun

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A critical plane criterion for non-stationary random vibration loading applicable in a statistical fatigue assessment

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Application of the Local Strain Approach to estimate fatigue life of clinched joints under constant and variable amplitude loading in different loading conditions

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