The application of coherent optics to the study of adhesive joints. I. Speckle photography

Authors

  • M. F. Vallat,

    1. Centre de Recherches sur la Physico-Chimie des Surfaces Solides, Centre National de la Recherche Scientifique, 24 Avenue du Président Kennedy, 68200 Mulhouse, France, and Laboratoire de Recherches sur la Physico-Chimie des Interfaces de l′Ecole Nationale Supérieure de Chimie de Mulhouse 3, Rue Alfred Werner, 68093 Mulhouse Cedex, France
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  • P. Martz,

    1. Centre de Recherches sur la Physico-Chimie des Surfaces Solides, Centre National de la Recherche Scientifique, 24 Avenue du Président Kennedy, 68200 Mulhouse, France, and Laboratoire de Recherches sur la Physico-Chimie des Interfaces de l′Ecole Nationale Supérieure de Chimie de Mulhouse 3, Rue Alfred Werner, 68093 Mulhouse Cedex, France
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  • J. Fontaine,

    1. Centre de Recherches sur la Physico-Chimie des Surfaces Solides, Centre National de la Recherche Scientifique, 24 Avenue du Président Kennedy, 68200 Mulhouse, France, and Laboratoire de Recherches sur la Physico-Chimie des Interfaces de l′Ecole Nationale Supérieure de Chimie de Mulhouse 3, Rue Alfred Werner, 68093 Mulhouse Cedex, France
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    • On leave of absence from Groupe de Recherche et d′Essais en Photonique Appliquée, 3 Rue de l'Université, 67000 Strasbourg, France.

  • J. Schultz

    1. Centre de Recherches sur la Physico-Chimie des Surfaces Solides, Centre National de la Recherche Scientifique, 24 Avenue du Président Kennedy, 68200 Mulhouse, France, and Laboratoire de Recherches sur la Physico-Chimie des Interfaces de l′Ecole Nationale Supérieure de Chimie de Mulhouse 3, Rue Alfred Werner, 68093 Mulhouse Cedex, France
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Abstract

A new technique of coherent optics, speckle photography, has been applied to the study of the behavior of adhesive joints under shear stress. This technique allows the determination of the in-plane motion by a point-by-point analysis with a sensitivity of about 3 μm. This property has been used to measure the interfacial displacement of model glass-glass joints bonded by different types of adhesive when submitted to shear. The experimental results permit direct verification of Volkersen's theory as well as the determination of the actual shear modull of the thin adhesive layer. The simplicity of use and interpretation of the technique of speckle photography should lead to significant application of this method in the future for the study of adhesive joints.

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