Expérimentation et modélisation du comportement mécanique de structures marines collées et aéronautiques collées-boulonnées

Abstract : Adhesive bonding is a way to design optimal structures because it allows the use of various materials for each part to join. Bonding can also be combined with another assembly technique, to sum their advantages. The issue of pairing materials and assembly techniques is, in our naval and aircraft application cases, a gain in weight and in fabric cost. The materials used are of various types: wood, composite, aluminium alloy, polyurethane and polysulfide adhesives. The naval case aims at classifying geometries of bulkhead / boat hull in terms of stiffness and strength. The aircraft study aims at understanding the mechanisms involved in a hybrid (bolted and bonded) assembly, and to simulate its deformation in tensile loading. The adopted approach is to go through successively from the basic scale to the industrial structure model by tests and computation loops, validating models by tests on increasing complexity specimens. For the polyurethane adhesive, basic characterizations have revealed its viscouselastic‐plastic behaviour and, by means of the multiaxial solicitation device Arcan‐Mines, the hydrostatic pressure influence on the plasticity surface. The constitutive law developed to represent these effects includes an original model of viscoelasticity and a modified Drucker‐Prager criterion. The latter, along with computational rules, is proposed as a criterion for resistance comparison between geometries. In the hybrid assembly case, it has been determined that the polysulfide adhesive used has a structural role: it significantly increases the joint stiffness in comparison with a simply bolted joint. A finite element method simulation can reproduce the elastic phase of deformation up to the structure's qualification load level in fatigue. All this work has provided elements of justification and choice to our partner's research offices for the design of their joints.
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Submitted on : Friday, September 14, 2012 - 10:41:57 AM
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  • HAL Id : pastel-00732181, version 1

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Michel Leroy. Expérimentation et modélisation du comportement mécanique de structures marines collées et aéronautiques collées-boulonnées. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0107⟩. ⟨pastel-00732181⟩

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