Analysis of the nonlinear behavior of adhesives in bonded assemblies - Comparison of TAST and Arcan tests

Type Article
Date 2008-12
Language English
Author(s) Cognard J1, Creac' Hcadec R1, Sohier L2, Davies PeterORCID3
Affiliation(s) 1 : ENSIETA, Mech Naval & Offshore Struct, F-29806 Brest, France.
2 : UBO, Lab Ingn Mecan & Elect, F-29285 Brest, France.
3 : IFREMER, Ctr Brest, Mat & Struct Grp, F-29280 Plouzane, France.
Source International Journal of Adhesion and Adhesives (0143-7496) (Elsevier), 2008-12 , Vol. 28 , N. 8 , P. 393-404
DOI 10.1016/j.ijadhadh.2008.04.006
WOS© Times Cited 73
Keyword(s) Adhesive testing, Mechanical properties of adhesives, Stress distribution, Epoxy/epoxides
Abstract 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. (c) 2008 Elsevier Ltd. All rights reserved.
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