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Mechanical Behavior Assessment of Epoxy Adhesive in the Double-Lap Joint
Gilibert, Y
Chef du groupe Composites et Collage, Maître de Conférences à l'Université de Reims, Palaiseau

Klein, MLL
Ingénieur de l'Armement à l'Ecole Nationale Supérieure de Techniques Avancées, Laboratoire de Mécanique et Energétique, Groupe Composites et Collage, Palaiseau

Rigolot, A
Professeur, Universités a l'Université de Reims, Palaiseau

Pages: 15    Published: Jan 1988

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Source: STP981-EB

Abstract

In order to evaluate the mechanical behavior of joints in a double-lap adhesively bonded assemblage by means of strain gages located at the outer surfaces of adherends, this study takes into account the non-linear beavior of the bond. This behavior may be caused by joint unevenness, which produces some plastic adaptation at the onset of pulling, or by the opening of microcracks. Since the measurement profile along the sample keeps the same shape as the analytic solution, at least up to the threshold of flaw propagation, the model is based on the classical theory that the adherends are solicitated in traction and the adhesives comport in simple shear but with a sliding coefficient (ratio of shear modulus to joint thickness) that varies along the overlap. A quasi-linear approximation of the solution permits a numerical estimation of shear modulus, which allows an assessment of adhesive mechanical properties and double-lap joint quality.

Keywords:
adhesive, adherend, joints, double-lap specimen, asymptotic analysis, mechanical properties, fracture (materials), aluminum, crack propagation, composite materials, evaluation, strain gages, extensometry, shear test, epoxy, elastic limit

Paper ID: STP30326S
Committee/Subcommittee: D14.03
DOI: 10.1520/STP30326S
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