Numerical study of the fracture behavior of single-lap joints with bi-adhesive in shear tests

Mohammed C. Ezzine , Ilias M.A. Ghermaoui , Kawther F.Z. Ezzine , Mohamed Mokhtari

Abstract

One of the primary causes of a decrease in strength in adhesive joints is the presence of stress concentrations at the ends of the overlap region. To address this issue effectively, the bi-adhesive technique has been introduced to minimize stress concentrations at the overlap ends. Several research efforts have been devoted to studying single lap adhesive joints. However, this type of assembly exhibits stress concentrations at the ends of the joint, in contrast to its inactive core. The aim of this research is to present a numerical analysis of single lap biadhesive joints using cohesive zone models with four different adhesives. Two adhesives of the same chemical composition, one rigid and one flexible, were used. The overlap length parameters for each adhesive area were considered. Thus, the placement of both rigid and flexible adhesives was optimized. The combination of both adhesives in a single lap adhesive joint, with the more rigid adhesive positioned at the core of the joint, provided enhanced strength to the assembly with a 37% improvement. The variation in overlap length of the adhesives in the bi-adhesive joints affected the joint toughness. Among them, the best results were obtained when covering 40% to 60% of the overlap length with the more rigid adhesive at the core of the joint.

Key Words

bi-adhesive joint; cohesive zone models; failure; single lap joint

Address

Mohammed C. Ezzine — Department of Mechanical Engineering, Mustapha Stambouli University of Mascara, 29000 Mascara, Algeria; Laboratoire Mécanique Physique des Matériaux, Department of Mechanical, Djillali Liabes University 22000 Sidi Bel Abbes, Algeria
Ilias M.A. Ghermaoui — Laboratoire Mécanique Physique des Matériaux, Department of Mechanical, Djillali Liabes University 22000 Sidi Bel Abbes, Algeria
Kawther F.Z. Ezzine — Department of physics, Faculty of Exact Sciences, Djillali Liabes University 22000 Sidi Bel Abbes, Algeria
Mohamed Mokhtari — Laboratoire LaRTFM, Ecole Nationale Polytechnique Maurice Audin, 31000 Oran, Algeria

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