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The crack propagation capability is then predicted using a mixed mode failure criterion implemented recently and proper fracture toughness data.
Before mixed mode failure, the quasi-analytical calculations obtained by a specific elastic model match experimental results under static and controlled displacement conditions.
In-plane shear properties were, however, estimated using the off-axial tensile method and assuming that the mixed mode failure criterion, i.e., Tsai Wu criterion, is valid for the composites.
A transition from plane stress to mixed mode failure was observed to occur when the intact ligament length decreased below ∼8B to 9B (where B is the sheet thickness).
Results from experimental testing of various aluminium epoxy butt-joints have been obtained and compared with model prediction showing a good correlation regardless the kind of rupture (adhesive, cohesive or mixed mode failure).
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The model extends a previous model, adding Puck's criteria to allow delamination-like, transverse cracking-like or mixed mode failures to be simulated.
Significant contributions of the work include the determination of optimum values of CZM parameters, and simulating mode I, mode II and mixed mode failures using a meshless method with the SSPH basis functions.
A mixed-mode failure has been defined and chosen to explain adhesion strength improvements for the different applications.
Finally, a generic failure criterion of either elliptic, parabolic or hyperbolic type, appropriate for the modeling of mixed-mode failure, is analyzed in a unified manner.
First of all, this type of delamination is considered as a mixed mode of failure at the material interfaces.
Finally, the mixed mode of failure due to the combined shear and concrete cover delamination is addressed through modelling plate-end and shear crack discontinuities using the discrete crack approach.
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