Mechanical protection for composite structures submitted to low energy impact

Abstract : Composite materials are widely used in aeronautical structures. These materials can be submitted to low energy impacts like tool drop, routine operations… Such impacts can generate damages in the material that significantly reduce the structure strength. A solution to reduce the severity of damages due to impact is to add a mechanical protection on composite structures (patent n° 2 930 478). In this paper, an experimental study on different concepts of protective layers is presented. This protection is made of a certain thickness of low density energy absorbent material (foam, honeycomb or stacking of hollow spheres) and a thin layer of composite laminate (Kevlar). Experimental impact tests with a spherical impactor of 20 mm diameter at low velocity and low energy are made on aluminum plates, with different protections, and for different levels of energy. Analyses of Load/Displacement curves enable to study the capability of each mechanical protection to absorb energy. Resistance of these protections is then compared and discussed, taking into account the thickness and the surface density of the protections.
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  • HAL Id : hal-01852288, version 1
  • OATAO : 4065

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Pierre Rahmé, Christophe Bouvet, Samuel Rivallant, Valia Fascio, Guy Valembois. Mechanical protection for composite structures submitted to low energy impact. ECCM14 - 14th European Conference on Composite Materials, Jun 2010, Budapest, Hungary. pp.0. ⟨hal-01852288⟩

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