金属-碳纤维增强树脂复合材料复合型柱壳屈曲特性试验及数值

Experimental and numerical study on buckling behaviour of steel-carbon fiber reinforced polymer hybrid cylindrical shells

为开展金属-碳纤维增强树脂复合材料(CFRP)复合型柱壳屈曲特性试验及数值研究,制作2组金属-CFRP复合型柱壳及金属柱壳,并对其几何误差检测,试验研究了金属-CFRP复合型柱壳屈曲特性。其次,基于真实几何缺陷,开展了复合型和金属柱壳线性屈曲及非线性屈曲分析,数值与试验具有良好一致性。最后,讨论了CFRP铺层角度、层数对复合型柱壳非线性屈曲载荷影响。结果表明:复合型及金属柱壳试验载荷误差分别为8.29%和6.77%,试验重复性良好;CFRP层可使金属柱壳获得70%的极限载荷增益,并可减弱金属层破坏强度;随着铺设层数增加,复合型柱壳受外压下的铺设角度相应减小,最佳铺设角度为65°~85°,且该范围内,铺设层数影响较小,相同铺设层数下载荷值最大相差7.56%,最小相差为0.57%。

The current study is an experimental and numerical investigation of the buckling of steel-carbon fiber reinforced polymer(CFRP)hybrid cylinders.Two groups of steel-CFRP hybrid and steel-only cylinders were manufactured.Geometric measurements and hydrostatic experiments were performed to determine the geometric and buckling properties of the cylinders.Linear eigenvalue and nonlinear analyses were performed to examine the buckling properties of the samples.The finite element model of each sample was established in accordance with the sample’s real geometric shape.The experimental and numerical data agree favorably.Furthermore,the effect of wrapped angle and layers in the hybrid cylinders on the cylinders’critical buckling load was investigated.The results indicate that the experimental results obtained for the four cylinders are repeatable.The maximum difference between the experimental collapse loads is 8.29%and 6.77%for the hybrid and steel-only cylinders,respectively.The stiffness provided by CFRP approximately is 1.7 times the loading capacity of the steel-only cylinders.The damage of steel layer of hybrid cylinders is smaller than steel-only cylinders.As the wrapped layers increase,the wrapped angle of CFRP layers of hybrid decreases.The optimal range of wrapped angle is 65°-85°.Wrapped layers have less effect on critical buckling load of hybrid cylinders with the wrapped angle of 65°-85°.The maximum and minimum difference errors are 7.56%and 0.57%,respectively.