Post-buckling response of scarf repaired laminates using a refined zigzag element

As part of the repair procedure, scarf joints commonly appear in composite structures. However, the scarf repair introduces an imperfection to the structure, thus causing the laminate to skip structural bifurcation, and directly experience post-buckling deformation under in-plane loads. For these reasons, understanding the post-buckling behavior of scarf-repaired laminates that are subjected to in-plane compressive and shear forces is essential to achieving a proper design. Although three-dimensional (3D) finite element models are capable of including the complexities arising from the geometry and presence of discrete adhesive layers between the repair and base materials, a proper aspect ratio between the elements requires a highly refined mesh, making the 3D finite element analysis computationally prohibitive in most practical applications. This study presents an approach that uses the refined zigzag element as an alternative to conventional solid elements when analyzing a composite component with a scarf joint.