Abstract
In this paper, a traction-separation-based cohesive modeling approach is proposed to predict the effect of z-pinning on laminated composites. A detailed experimental characterization of the z-pin pullout process using the flatwise tension test is presented. Utilizing these flatwise tension results, numerical simulation of the progressive damage due to delaminations in a double cantilever beam with z-pinning has been performed. Experimental details of the z-pinned double cantilever beams are presented for IM7/977-3 graphite/epoxy. The approach taken in this study utilizing the cohesive elements within the Abaqus® finite element software has proven that the models can predict the behavior of z-pinned composites close to experimental observations. It was found that the discretization of the fracture resistance curve along the z-pin field is essential to capture the dynamics of the delamination accurately.
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