Transverse cracking scenarios under oxidation and mechanical loading in polymer matrix composites. Keynote lecture.

Abstract : At relatively high temperatures (150-300C), polymer oxidation leads to differential shrinkage and evolution of the properties of polymer matrix composites. These local modifications of a thin surface layer may lead to oxidation-related cracking and they generally modify the ‘classical’ cracking scenario during mechanical loading. In this work, [90=0]s specimens subjected to oxidation and mechanical loading are simulated via Finite Fracture Mechanics (FFM). The effectiveness of FFM for the prediction of transverse cracking has been previously demonstrated [1, 2]. Here, we use it to account for the competition between cracking scenarios. A finite element model including the oxidized layer was used to compute the strain energy release rates for different configurations. The appearance of ‘partial’ cracks during oxidation is interpreted by considering the stability of propagation across the different layers. Different cracking scenarios involving ‘partial’ and ‘through-ply’ cracks are modeled as well as their interaction during the evolution of the mechanical loading. These results provide some insight on the mechanisms leading to crack creation under combined mechanical and environmental loading [3]. Further developments include the experimental determination of the strain energy release rate of the oxidized composite [4] and the strong coupling of the FFM approach with a diffusion/reaction model in order to account for the enhanced diffusion generated by crack creation for long aging times.
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Conference papers
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https://hal.archives-ouvertes.fr/hal-01581911
Contributor : Federica Daghia <>
Submitted on : Tuesday, September 5, 2017 - 12:03:03 PM
Last modification on : Friday, May 24, 2019 - 5:27:14 PM

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  • HAL Id : hal-01581911, version 1

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Federica Daghia, Fangzhou Zhang, Pierre Ladevèze. Transverse cracking scenarios under oxidation and mechanical loading in polymer matrix composites. Keynote lecture.. CFRAC 2015 - Fourth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures, Jun 2015, Cachan, France. ⟨hal-01581911⟩

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