Interlaminar Fracture Behavior of Composites: The Role of Interface Layers Angle and Cure State in Mode I Delamination Growth

Abstract Composite laminates are widely used in structural applications due to their high stiffness-to-weight ratio and tailoring capability; however, their durability is often limited by interlaminar crack growth. Under Mode I loading, the strain-energy release rate governs delamination resistance and is influenced by both interfacial fiber orientation and the curing condition of the polymer matrix. This study presents a systematic experimental investigation of the effects of interface ply angl