Computational analysis of free-edge effects in composite laminates using Abaqus

<p>The free-edge effects are related to singular stress states at the interfaces between dissimilar layers in the vicinity of geometrical or mechanical discontinuities within the laminar composite. Stress concentration at free edges can further lead to delamination and a significant drop in stiffness, with fracture occurring at lower loads than expected. The paper deals with the computational (finite element) modeling of free-edge effects in cross-ply composite laminates. For this purpose, Abaqus software package has been used and two solid finite element types have been applied. Free-edge stress field of laminar composites under axial extension has been analyzed. Several numerical examples of cross-ply composites with various stacking sequences have been presented, and the results are compared against the existing analytical solutions based on the improved first-order shear deformation theory. Additionally, a parametric study has been conducted, focusing on the variation of τ<sub>yz</sub> stresses through free edges as a function of plate thickness.</p>