Analysis of the non linear behaviour of an adhesive in bonded assemblies Comparison of TAST and ARCAN tests

Jean-Yves Cognard (1) , Romain Créac'Hcadec (1) , Laurent Sohier (2) , Peter Davies (3)

1 MMA
2 UBO - Université de Brest
3 RDT - Unité Recherches et Développements Technologiques

This paper describes a study in which the shear behavior of a structural epoxy adhesive has been measured using the standard thick adherend shear test (TAST) specimen and a modified Arcan test. A numerical study of the TAST test taking into account the nonlinear behavior of the adhesive and the finite deformations of the adhesive joint, shows that there is a localization of plastic zones close to the adhesive–substrate interface near the free edge of the adhesive. Experimental tests carried out with steel and aluminum substrates and with various adhesives also show that failure initiates in this region. These edge effects in the TAST fixture can lead to an incorrect analysis of the behavior of the adhesive (for instance, underestimation of the shear stress in the joint at failure), particularly when an adhesive failure mode is dominating. The modified Arcan fixture provides a more homogeneous stress state. A similar improvement of the TAST fixture is proposed.

Mots clés: Epoxy/epoxides; Stress distribution; Mechanical properties of adhesives; Adhesive testing

Jean-Yves Cognard, Romain Créac'Hcadec, Laurent Sohier, Peter Davies. Analysis of the non linear behaviour of an adhesive in bonded assemblies Comparison of TAST and ARCAN tests. International Journal of Adhesion and Adhesives, 2008, 28 (8), pp.393-404. ⟨10.1016/j.ijadhadh.2008.04.006⟩. ⟨hal-00449161⟩