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A methodology based on the coupled criterion for the assessment of adhesive-to-adherend interface crack initiation

Abstract : In the framework of lightweight structures, the bonded joints appear as a suitable solution for increasing the mass-to-strength ratio. However, the full understanding of the interface debonding is a key obstacle to be overcome in critical systems. For characterizing adhesive-to-adherend interface crack initiation, the three-point bending test has been shown as a useful test that provides an identifiable small round zone. The samples were manufactured using an aluminum alloy 2024-T3 etched with nitric acid. The adhesive consisted in an epoxy pre-polymer DGEBA, DETA amine and an organosilane GLYMO directly introduced in the mixture. A coupled stress and energy criterion was used for the assessment of the properties of the interfacial debonding, since a stress concentration appears near to the corner of the specimen. For a quick computation, the application of the coupled criterion (CC) used the macro-element technique. On the other hand, most finite–element-based software has already implemented the cohesive zone modeling (CZM). In this sense, the fracture parameters computed via CC were used for the assessment of cohesive zone modeling of adhesive-to-adherend interface crack initiation. The results of fracture initiation using the CZM showed a good agreement in a macroscale response with the experimental campaign, thus providing a useful tool for a rapid estimation of cracking initiation.
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Submitted on : Monday, June 22, 2020 - 4:20:33 PM
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Thiago Birro, Eric Paroissien, Maëlenn Aufray, Frederic Lachaud. A methodology based on the coupled criterion for the assessment of adhesive-to-adherend interface crack initiation. International Journal of Adhesion and Adhesives, Elsevier, 2020, 102, pp.102664-102676. ⟨10.1016/j.ijadhadh.2020.102664⟩. ⟨hal-02877747⟩



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