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Analyse fine du mécanisme d'interaction dans les structures souples assemblées par collage

Abstract : An improved method is presented for the analysis of the shear and peel stresses in adhesively-bonded joints in structures subjected to bending and buckling. The method is based on a precise description of the kinematics equations in a beam cross-section. Second order effects due to the slenderness of the member as well as transverse deformation in the adhesive joint due to differential curvature between the two adherends are taken into account. Governing equations for the interfacial stresses are established in the form of two coupled differential equations in terms of the shear and peel stresses in the adhesive joint. This interaction is taken into account. A general solution for these two equations is proposed, which yields two fully coupled closed form equations for the stresses. These general equations may be adapted to any particular configuration by means of appropriate boundary conditions. Calculations are worked out for several exemplaries such as single lap and structures reinforcement. The reinforced structure is subjected to different kinds of loads : bending and buckling. The theoretical results are found to be in good agreement with reference values obtained by means of a FEM analysis, especially in the anchorage zones where the interfacial stresses reach their critical values. It is concluded that the closed form solution presented in the document is suitable for a precise estimation of the interfacial stresses in bonded structural members subjected to buckling. It leads to an improvement of existing models (up to 30% percent for the shear stress and up to 80% for the peel stress, depending on the configurations). Experimentations on a reinforced structure have been conducted. Concerning classical loadings such as bending, they show that the hypotheses which the closed form solution is drawn from, lead to an accurate model. In the case of buckling, small variations of the parameters modify greatly the experimental results. More experimentations have to be realized in order to study more accurately the behaviour under buckling.
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Submitted on : Tuesday, August 28, 2012 - 11:53:04 AM
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  • HAL Id : tel-00725912, version 1


Pascal Coudor. Analyse fine du mécanisme d'interaction dans les structures souples assemblées par collage. Mécanique des solides [physics.class-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2009. Français. ⟨NNT : 2009CLF21916⟩. ⟨tel-00725912⟩



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