Résumé

Results of bridging tractions in mode I delamination on uniaxially reinforced AS4/PPS specimens are presented. Bridging tractions determined using distributed strains and an inverse- numerical technique are compared to those obtained using a method based on the experimental measurements of energy release rate and crack opening displacement. Both experiments result in similar distributions of the bridging tractions. The two types of bridging laws are implemented in a numerical model that uses cohesive elements to calculate global force- displacement response. In both cases the cohesive model can describe the global load- displacement curve well. However, the J-integral method requires an additional assumption about the length of the bridging zone. Regardless of the law used to define the bridging tractions, the cohesive model requires certain assumptions regarding the initial stiffness of the cohesive elements and the maximum stress before softening. These parameters influence crack propagation and the resulting strains.

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