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Abstract
Flexible adhesives play an important role in various applications. The possibility of bonding dissimilar substrates has generated wide interest in flexible adhesives. However, most of the theoretical and experimental investigations have focused on rigid epoxy adhesives. The purpose of this work is to investigate the mechanical behavior of a flexible adhesive joint in the overlap region. Aluminum adherends were used for single lap joint made with an adhesive characterized by high flexibility and large strains. The specimen was tested in tension. Full-field displacements of the overlap region were measured by the Digital Image Correlation method. A large shear strain of the order of 48% was observed. Small transverse deflections of the adherends were estimated. Also, it was observed that the shear strain distribution in the adhesive layer decreases at the overlap ends, which is different from previously reported results in the literature.
Highlights
Knowledge of adhesion has a great importance for many bonded structures, mainly in automotive, aircraft and marine structures
The majority of stiff adhesives are employed in structural applications, while flexible adhesives are indicated for some particular cases
The behavior of a single lap joint made with a flexible adhesive and aluminum adherends was experimentally investigated
Summary
Knowledge of adhesion has a great importance for many bonded structures, mainly in automotive, aircraft and marine structures. A better understanding of the mechanical behavior of adhesively bonded joints necessitates a detailed investigation of the adherend and adhesive, as well as of the adherend-adhesive interface. The use of flexible adhesives in engineering structures allows displacement between joints and can avoid structural failure. They may be used for bonding dissimilar substrates that present different coefficients of thermal expansion. Several investigations have been concerned with mechanical behavior of bonded joints. An improvement to classical models of bonded lap joints has been proposed by Tsai et al [4]. Full-field optical methods such as Moiré and Digital Image Correlation have been employed to determine strain fields of adhesively bonded joints [11,12,13,14,15]
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