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Behaviour analysis of carbon-epoxy laminates under high-speed loading: manufacture of the same materials by means of microwave curing for comparison

Gregor Hug
Abstract : The context of the present study is the optimisation of laminated composites used in stafety strucures for aircraft. The function of theses structures is to protect the passengers in case of a crash by aborbing a maximum of the impact energy. The structures consist of a multi-layer laminate composed of several sub-laminates. Among the latter are the carbon-epoxy laminates analysed in this study. The ability of the material to absorb mechanical energy is essentially due to the damageability of its microstructure. In ordrer to optimise the multi-lyayer laminate in terms of energy absorption, reliable data on the mechanical properties of the sub-laminates are needed at both the initial and the damaged state. The behavoiur of the materials depends on several factors as the manufacturing process, the direction of the applied mechanical load and the lading rate. Within this context, this reserach project follows an interdicisplinayr approach aiming at building a link between the manufacturing process, the microstruture of the produced laminate and its mechanical properties. This approach splits into the three principal subjects of the present study. The first one deals with the manufacturing process: the conventional thermal curing by means of an autoclave is compared to an alternative process based on microwave heating. The other two subjects treat the behaviour of the material under high-speed loading. The influence of the loading rate on the material's mechanical behaviour is analysed for two different loading conditions: off-axis tensile loading (load applied under 45 ° with respect to the reinforcing fibres) and mode l loading, leading to ply delamination. The implemented work includes the development of the necessary experimental means as well as the analysis of the studied composites through observations at the macroscopic and the microscopic scale. Particular attention has been paid to the damage mechanisms since they account for the ability of the material ot absorb the energy of a crash.
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https://pastel.archives-ouvertes.fr/pastel-00001562
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Monday, January 23, 2006 - 8:00:00 AM
Last modification on : Monday, January 23, 2006 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:01:35 PM

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  • HAL Id : pastel-00001562, version 1

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Gregor Hug. Behaviour analysis of carbon-epoxy laminates under high-speed loading: manufacture of the same materials by means of microwave curing for comparison. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2005. English. ⟨NNT : 2005ENAM0010⟩. ⟨pastel-00001562⟩

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