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Experimental characterization of the fracture behaviour of an adhesive under mixed mode dynamic loading

Abstract : Adhesive joints are widely developed in aeronautical applications. These bonded assemblies have to support dynamic impact sollicitations and failure has to be predicted. The material viscous failure mechanisms in the adhesive are rate sensitive. Moreover, the joint failure usually occurs under a mixed-mode combination of traction and shear loading. However, current cohesive zone models do not take into account the possible coupling between loading rate-dependency and the mode mixity. The aim of this work is consequently to characterize the fracture behaviour of adhesives under mixed mode dynamic loadings. For that purpose, a new experimental protocol is developed. With the same equipment, small variations of specimen's geometry are employed to cover the wide range from traction to shear loading. The dynamic loading is achieved using a servohydraulic testing machine. The validity of the protocol under quasi-static loading is experimentally confirmed by comparison to a reference test. The quasi-static fracture toughness and failure surfaces are found equivalent under shear mode II and mode III. Moreover, the fracture toughness is found to decrease when rising the loading rate, whatever the mode mixity. Finally, a failure criterion is defined to take into account both the rate and mixed mode in uence on the fracture toughness.
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https://hal-uphf.archives-ouvertes.fr/tel-03373811
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Submitted on : Monday, October 11, 2021 - 4:44:55 PM
Last modification on : Tuesday, October 19, 2021 - 4:35:49 PM

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  • HAL Id : tel-03373811, version 1

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Noëlig Dagorn. Experimental characterization of the fracture behaviour of an adhesive under mixed mode dynamic loading. Engineering Sciences [physics]. Université Polytechnique Hauts-de-France; Institut national des sciences appliquées Hauts-de-France, 2020. English. ⟨NNT : 2020UPHF0011⟩. ⟨tel-03373811⟩

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