Composite Laminate Design for Improved Open-Hole Compression Strength Using Non-Standard Ply Angles and Customized Stacking Sequences Characterized By [D] Matrix

The design of the composite materials in this study is used stacking sequences and ply angles. This research study is used non-standard ply angle designs and flipped angle designs to improve the open-hole compression strength of composite laminates with stiffness. Non-standard angle designs have the possibility to reduce the weight, less sensitivity to the hole, and better efficiency to the small load misalignment. Flipped angle designs improve the open-hole compression failure strength using the non-standard and standard ply angles by up to 33%. Stacking sequences of the composite laminates were optimized to reduce the ply thickness under in-plane uniaxial and multi-axial. This design is shifting from fiber fracture to shear fracture mechanisms for un-flipped angle and predicting Tr [D*] matrix from Classical Laminate Theory (CLT) which is characterized by [D] matrix.