Test de Lap Shear

(En anglais seulement) Like the peel test, the lap shear is important for the mechanical characterization of adhesives. In this test configuration, two layers of material bonded together by an adhesive are forced to slide against each other (no peeling) inducing shear in the adhesive layer and eventually its rupture. Adhesive shear modulus can be characterized through multiple testing methods. Two common methods are Lap joint (testing planar shear to find the shear modulus and shear strength) and Butt joint (testing tensile yield to find shear modulus and elastic-plastic parameters). A planar shear test implies that the moving platen moves in the same plane as the bond. Under these configurations, the sample is assumed to be a perfect rectangle with its top and bottom surfaces perfectly attached onto both flat substrates (non-slipping boundary condition), although this configuration can also record force vs. displacement data for stick-and-slip physical adhesion.