Mechanical Response of Cross-Ply and Angle-Ply Ceramic Composite Laminates

摘要

This report summarizes the investigations performed under Contract AFF49620-94-1-0344, titled, 'The Mechanical Response of Cross-Ply and Angle-Ply Ceramic Composite Laminates'. The study of deformation and fracture in cross-ply fiber reinforced ceramic laminates consisted of two parts. The first study aimed at predicting the macro level stress and strain response and included experimental and analytical components. The second study focused on detailed failure mechanisms, striving the determine analytically the advent of failure in the 90 deg plies and its progression into the 0 deg layers. Both foregoing investigations employed fracture energy considerations to determine failure. The study of failure in off axis and angle-ply laminates utilized detailed fracture mechanics analyses to compute both singular and far field stresses associated with cracks impinging on inclined bi-material interfaces. The results provided a rational explanation for observed response.