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Microcracking is modeled explicitly using the cohesive interface approach.
The adhesive layer is modeled by using the cohesive interface elements with the capability of simulating the damage initiation and evolution mechanisms of adhesives.
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The crack initiation and progression in the filler was predicted using the Virtual Crack Closure Techniques (VCCT) and the delamination at the skin-filler interface was modelled using the cohesive surfaces.
This is put forward by using the cohesive zone model (CZM) for finite thickness interfaces recently proposed by the authors and implemented in the finite element program FEAP.
The present work is concerned with an analysis of progressive interface failure under normal compressive stress and varying shear stress using the cohesive crack model.
Delamination at interfaces between the adhesive and the polymeric sheets is simulated by using the cohesive zone model incorporated in LS-DYNA.
The cohesive interface model is formulated using a potential function and it takes into account the shear effects, the effect of the peeling stresses, and the coupling of the shear and the peeling effects.
The formulation of the Cohesive Interface Model (CIM) predicts the interface damage assuming the frictional contact between debonded surfaces.
The cohesive interface was modeled with a viscosity-modified Xu Needleman cohesive zone law, and the solids were characterized with continuum elastic and elastic plastic constitutive models.
The analysis is carried out by using the interface cohesive models proposed by Hutchinson & Suo, Xu & Needleman, and Camacho & Ortiz.
Units and mortar joints have been modelled with continuum elements whereas the cohesive interfaces with zero thickness have been used for the unit-mortar interfaces.
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