Fatigue life prediction of composite materials based on improved residual strength model

Weitao ZHAO; Qinghui MENG

doi:10.3969/j.issn.2095-1248.2024.03.001

Journal of Shenyang Aerospace University >

2024 , Vol. 41 >Issue 3: 1 - 6

DOI: https://doi.org/10.3969/j.issn.2095-1248.2024.03.001

Aerospace Engineering

Fatigue life prediction of composite materials based on improved residual strength model

Weitao ZHAO ,
Qinghui MENG

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College of Aerospace Engineering，Shenyang Aerospace University，Shenyang 110136，China

Received date: 2024-01-17

Online published: 2024-08-30

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Abstract

The strength degradation law of composite materials is very important for studying the structural fatigue life. However， some parameters involved in existing residual strength models are confirmed using residual strength test data， so the cost of model construction is high. By exploring the relationship between fatigue life and residual strength of composite materials， taking the cumulative distribution function of fatigue life as the starting point， a damage degree with clear physical meaning was constructed，and then an improved residual strength model was proposed. The improved residual strength model didn’t need residual strength test data but only initial static strength and fatigue life data. A fatigue life prediction model called S-N-φ model was constructed based on the improved residual strength model， which can consider the influence of initial static strength on fatigue life. The results show that the prediction accuracy of the improved residual strength model is satisfactory， and the S-N-φ model has better prediction accuracy than the classical S-N curve model.

Key words： composite materials; residual strength; fatigue life; S-N curve; damage degree

Cite this article

Weitao ZHAO , Qinghui MENG . Fatigue life prediction of composite materials based on improved residual strength model[J]. Journal of Shenyang Aerospace University, 2024 , 41(3) : 1 -6 . DOI: 10.3969/j.issn.2095-1248.2024.03.001

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