Buckling analysis of asymmetric composite laminates with extension-twist multi-couplings

Abstract Compared to conventional extension-twist coupled laminates, multi-coupled laminates with combined extension-twist interactions demonstrate superior mechanical performance, particularly in enhanced coupling characteristics and improved buckling resistance. A novel buckling analysis model for asymmetric composite extension-twist and bend-twist multi-coupled laminates is presented by this study. We successfully derive theoretical solutions for determining the critical buckling load of these multi-coupled asymmetric laminates through the synergistic integration of analytical derivation and deep learning algorithms. Our approach enables theoretically-guided optimization of asymmetric laminates with explicit consideration of buckling performance. Comparative analysis reveals remarkable consistency (within 3% deviation) between analytical predictions and numerical simulations of critical buckling loads. Significantly, the multi-coupled laminates exhibit simultaneous enhancement of both extension-twist coupling effects and critical buckling loads - achieving approximately 30% and 10% improvement for 7-layer and 8-layer configurations, respectively. Comprehensive robustness analysis validates the precision of layup techniques, while coupled numerical simulations and experimental buckling tests conclusively demonstrate the laminates' hygrothermal stability, coupling efficiency, and buckling load accuracy. The proposed methodology offers generalizability for buckling analysis of various multi-coupled asymmetric laminates.