Buckling and postbuckling behavior of square compression-loaded graphite-epoxy plates with circular cutouts

摘要: Results are presented for unidirectional (0, 10)(sub s) and (90,10)(sub plates, ((0/90)(sub 5)(sub s)) aluminum plates. also ((+/- theta)(sub 6)(sub angle-ply plates values of theta = 30, 45, 60 degrees. The results indicate that the change in axial stiffness a plate at buckling is strongly dependent upon cutout size orthotropy. presence gives rise to an internal load distribution changes, sometimes dramatically, as function coupled with In buckled state, role orthotropy becomes more significant since bending addition membrane present. Most cutouts exhibited less postbuckling than corresponding without cutout, decreased increasing size. However, some highly orthotropic cutout. These suggest possibility tailoring stacking sequence composite optimize stiffness. It was found large radius do exhibit strength. can influence modal interaction plate. Specifically, show relatively small higher due interaction. Other nonlinear prebuckling deformations, material nonlinearity, 45 deformations pronounced degrees become even increases. how load-path eccentricity improper machining test specimens affects behavior. Some snap-through type