压载荷下Ⅰ-Ⅱ复合型中心裂纹板弹塑性屈曲载荷研究OA北大核心CHSSCDCSTPCD

In order to study the bearing capacity of structures with cracks,a model of Ⅰ-Ⅱ mixed centrally cracked plate under compressive load was established using finite element method,and its elastic-plastic buckling load was calculated.The influences of various factors,including relative crack length(a/w),crack inclination angle(θ),plate width(w),plate thickness(t),and boundary conditions,on the elastic-plastic buckling load were explored.For the centrally cracked plate with clamped support on the upper and lower edges,as the crack length and crack inclination angle increased,the wider the crack width and the more sensitive the buckling load of the plate became to the cracks,significantly affecting its load-bearing capacity.The elastic-plastic buckling load increased with plate thickness.However,as the crack inclination angle increased,the thicker the plate and the more significant the decrease in its buckling load.The variations in buckling load for the centrally cracked plate with simple support on the upper and lower edges were basically the same as those with clamped support.However,the buckling load of the latter was significantly greater than that of the former.A regression equation relating the elastic-plastic buckling load to relative crack length and crack inclination angles under different boundary conditions was obtained.It was found that the elastic-plastic buckling load calculated using compressive mechanical properties aligned more closely with the experimental results,and the variations in the experimental buckling load were consistent with the finite element simulation results.These findings provide reference values for evaluating the load capacity of structures with cracks.