Cohesive zone finite element analysis of crack initiation from a butt joint's interface corner

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:51

Article

Reedy, E. D., Jr.

关键词: Cohesive zone;    Bonded joint;    Interface corner;    Interfacial fracture;   

DOI  :  10.1016/j.ijsolstr.2014.08.020

来源: Elsevier

【 摘 要 】

Cohesive zone (CZ) fracture analysis techniques are used to predict the initiation of crack growth from the interface corner of an adhesively bonded butt joint. In this plane strain analysis, a thin linear elastic adhesive layer is sandwiched between rigid adherends. There is no preexisting crack in the problem analyzed, and the focus is on how the shape of the traction-separation (T-U) relationship affects the predicted joint strength. Unlike the case of a preexisting interfacial crack, the calculated results clearly indicate that the predicted joint strength depends on the shape of the T-U relationship. Most of the calculations used a rectangular T-U relationship whose shape (aspect ratio) is defined by two parameters: the interfacial strength sigma*. and the work of separation/unit area Gamma. The principal finding of this study is that for a specified adhesive layer thickness, there is any number of sigma*, Gamma combinations that generate the same predicted joint strength. Each combination corresponds to a different CZ length. An approximate CZ-like elasticity solution was developed to show how such combinations arise and their connection with the CZ length. (C) 2014 Elsevier Ltd. All rights reserved.

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