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Communication Dans Un Congrès Année : 2022

Fatigue life of carbon-epoxy laminated composites: combining thermo-mechanical analysis and residual strength model

Résumé

Long-term durability under repeated mechanical loading is a major criterion for design of composite structures. The development of a fatigue criterion faces two major difficulties: (i) the proposal of a load/life curve (S-N curve) describing the natural dispersion of the fatigue tests and (ii) the duration of these tests. In order to deal with the first point, Sendeckyj proposed an approach based on a so-called residual strength that fits S-N curve and associates a failure probability [1]. The procedure to identify this model requires quasi-static and fatigue tests. This fatigue campaign could be large and time consuming. A solution to decrease the duration of the tests consists in using a self-heating-based method [2]. The principle is to estimate a mean S-N curve from the thermal dissipation, inferred from temperature measurements on a single sample. This method reduces drastically the duration of the fatigue tests campaign. However, neither the associated dispersion nor the low cycle fatigue part is estimated for now for this class of materials. The goal of the study is to combine the two approaches (residual strength and thermal measurements) in order to identify the S-N curve and the related dispersion. The fatigue lifetime for high cycles loading is estimated by the heat-build up protocol. Quasi-static tests and a few fatigue tests are used to estimate the failure distribution based on a two-parameters Weibull model. The article will detail this approach and will present the results obtained on laminated composites carbon-epoxy manufactured from unidirectional plies and 2D-woven plies.
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Dates et versions

hal-04281737 , version 1 (13-11-2023)

Identifiants

  • HAL Id : hal-04281737 , version 1

Citer

Kilian Demilly, Yann Marco, Vincent Le Saux, Guillaume Dolo, Emilien Billaudeau, et al.. Fatigue life of carbon-epoxy laminated composites: combining thermo-mechanical analysis and residual strength model. 25e Congrès Français de Mécanique, Aug 2022, Nantes, France. ⟨hal-04281737⟩
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