Effects of adhesive thickness on global and local Mode-I interfacial fracture of bonded joints

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:47

Article

Ji, Gefu¹  Ouyang, Zhenyu²  Li, Guoqiang^1,2  Ibekwe, Samuel²  Pang, Su-Seng¹ 

[1] Louisiana State Univ, Dept Mech Engn, Baton Rouge, LA 70803 USA

[2] Southern Univ, A&M Coll, Dept Mech Engn, Baton Rouge, LA 70813 USA

关键词: Cohesive zone model;    Bonded joints;    Adhesive thickness;    Toughness;    Plastic zone;    Interfacial strength;    Cohesive law;    Cohesive strength;   

DOI  :  10.1016/j.ijsolstr.2010.05.006

来源: Elsevier

【 摘 要 】

The interfacial fracture of adhesively bonded structures is a critical issue for the extensive applications to a variety of modern industries. In the recent two decades, cohesive zone models (CZMs) have been receiving intensive attentions for fracture problems of adhesively bonded joints. Numerous global tests have been conducted to measure the interfacial toughness of adhesive joints. Limited local tests have also been conducted to determine the interface traction-separation laws in adhesive joints. However, very few studies focused on the local test of effects of adhesive thickness on the interfacial traction-separation laws. Interfacial toughness and interfacial strength, as two critical parameters in an interfacial traction-separation law, have important effect on the fracture behaviors of bonded joints. In this work, the global and local tests are employed to investigate the effect of adhesive thickness on interfacial energy release rate, interfacial strength, and shapes of the interfacial traction-separation laws. Basically, the measured laws in this work reflect the equivalent and lumped interfacial fracture behaviors which include the cohesive fracture, damage and plasticity. The experimentally determined interfacial traction-separation laws may provide valuable baseline data for the parameter calibrations in numerical models. The current experimental results may also facilitate the understanding of adhesive thickness-dependent interface fracture of bonded joints. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

Free