Theoretical and experimental investigation of stress redistribution in open hole composite laminates due to damage accumulation

摘要: Abstract Two methods were examined for the prediction of stress redistribution due to subcritical damage accumulation near open holes in composite laminates. A finite element analysis conjunction with method material property degradation was performed assess accuracy fiber direction formation longitudinal splitting. simple case a unidirectional an hole considered. The unable accurately predict relaxation splitting, which laminates is paramount importance accurate ultimate strength. Three-dimensional ply level modeling discrete quasi-isotropic laminate subsequently Normally mesh configuration dictated by boundaries specimen, such as presence hole, creating formidable difficulties matrix cracking, aligned given ply. independent displacement discontinuity based on higher order shape functions constructed this purpose. surface jump associated cracking defined terms domain Heaviside function approximated using polynomial B-splines. Moire interferometry used determine strain and fields layers composite, previously prestressed beyond initiation load. Good correlation between experimental data predicted technique observed.