Second, numerous criteria, including commonly used engineering criteria, crack initiation criteria based on the finite fracture mechanics, or cohesive criteria, were adapted to fit the experimental results.
Through assessment of analytical models, we find that the cohesive zone criterion based on the beam bend model is suitable for a weak interface strength case and it describes a macroscale fracture process zone case, while the two-dimensional finite element model is effective to both the strong interface and weak interface, and it describes a small-scale fracture process zone case.
A cohesive based failure criterion is also incorporated to accurately represent the constitutive softening response in the case of progressive failure.
Based on 3D-Hashin failure criterion, cohesive behavior failure criterion and brittle cracking failure criterion of novel GFRP foam sandwich adhesive joints, a progressive damaged model is established to simulate the strength and the results of FEM model and experiments are in good agreements.
It is the goal of the team to assemble information into a cohesive set of criteria so that everyone on the team is engaged in the same way for the same objective.
For the double K fracture criterion, a cohesive fracture toughness in introduced to calculated the initial cracking fracture toughness.
A finite-element-method-based model was developed with the application of Hill yield criterion and cohesive zone material model was applied to simulate crack propagation.
The micromechanical model could simulate the matrix failure and debonding of the fiber/matrix interface by the Christensen failure criterion and cohesive zone modeling, respectively.
Two dominant damage mechanisms, i.e. matrix elasto-plastic response and fibre matrix decohesion are considered and modelled using a non-associative pressure dependent paraboloidal yield criterion and cohesive interface elements respectively.
A cohesive-zone-like model is formulated in the context of damage mechanics based on the definition of a relationship between the interface tractions t and the displacement jumps [[u]] = u+ - u-, and on a damage criterion for the cohesive process zone growth and the crack advancement.
