Comparative analysis of adhesive debonding in three-point bending tests using boundary element methods: Coupled criterion versus interface damage model
Résumé
Recent literature has introduced a novel quantitative approach for assessing critical stress and fracture
toughness, utilizing a coupled stress energy criterion, commonly referred to as the coupled criterion (CC).
However, evaluating the required parameters demands considerable effort using semi-analytical methods or
finite element analysis techniques. The Boundary Element Method (BEM) provides an alternative to traditional
approaches, as it eliminates the need for domain meshes and directly computes unknown field variables on
the interfaces. The present study employs the CC and a 2D multi-zone BEM to access failure initiation and
propagation in the adhesive interface of three-point bending test (3PBT’s) with available experimental and
numerical responses. The interface properties are then used in a progressive interface damage BEM analysis to
evaluate the structural response of the tests and validate the values obtained for these properties. The study
addressed both symmetric and asymmetric adhesive failure scenarios, indicating that the evaluation of fracture
parameters in both cases is analogous because of the short crack length at the onset of failure. The results
demonstrate that the use of the new quantitative methodology with BEM models, proposed herein, allows one
to model complex geometries and interface debonding problems with greater accuracy and efficiency.
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