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Communication Dans Un Congrès Année : 2016

Characterisation of high strain rate dependency of 3D woven CFRP materials

Résumé

New composite materials are increasingly used in aviation to reduce the mass of structures. Aeronautic structures have to be designed so as to be able to sustain a broad range of mechanical loadings during their operational life. These loading cases need also to account for low to high loading rates. The main objective of the present work is to establish and characterize the rate-dependency of the visco-elastic behaviour of polymer reinforced composite materials. More specifically, new generations of 3D carbon/epoxy composite materials are of interest because of their high mechanical performances, which require specific experimental developments to be done. Due to the large size of their textile Unit Cell and carbon fibre high strength and stiffness, unusual dynamic test capabilities are required, which lead to revisit the test protocols, specimens definition and instrumentation. The experimental method described in this work is applied to analyze the strain rate sensitivity of the mechanical behaviour of such a 3D woven composite material. The experiments were performed with a dynamic servo-hydraulic testing machine (ONERA) for a strain rate range varying between 10 −4 s −1 and 10 s −1. The linear mechanical behaviour of the material in warp, weft and 45 • directions is characterized. These tests, together with the new experimental protocol, permit to accurately reveal and measure the material behaviour strain rate sensitivity, which proved to be large in the 45° direction.
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Dates et versions

hal-01354133 , version 1 (17-08-2016)

Identifiants

  • HAL Id : hal-01354133 , version 1

Citer

N. Tran, J. Berthe, M. Brieu, G. Portemont, E. Deletombe, et al.. Characterisation of high strain rate dependency of 3D woven CFRP materials. 17th European Conference on Composite Materials (ECCM17), Jun 2016, MUNICH, Germany. ⟨hal-01354133⟩

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