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研究了1/3弧长带有口盖复合材料柱壳的压缩行为.实验测试的带口盖柱壳结构在压缩后发生局部屈曲变形,无后屈曲现象发生,屈曲破坏载荷为118.944 kN.利用ABAQUS有限元软件建立相应有限元模型计算其屈曲破坏行为,并将计算结果与实验结果进行比较,证明所建立的模型正确有效.利用所建立的模型,探究提高结构屈曲载荷的方法.研究表明:补片与口盖的铺层角度对结构的屈曲载荷有直接影响,如果补片与口盖的铺层角度由0°变为20°后,结构屈曲载荷可以分别提高6.8%和2.4%;补片厚度也与结构屈曲载荷相关,但试图增加现有补片厚度来提高结构屈曲载荷方法并不十分理想.当补片厚度由11层提高到16层时,结构屈曲载荷也仅提高了2.37%,考虑成本与重量因素,此方法与改变铺层角度相比不可取.
The compression behavior of a 1/3 arc-length composite shell with a cover was studied. The buckled shell with a cover was subjected to local buckling after compression without buckling, with a buckling failure load of 118.944 kN. ABAQUS finite element software to establish the corresponding finite element model to calculate the buckling failure behavior and to compare the calculated results with the experimental results to prove that the model is correct and effective.Using the established model to explore the method of increasing the buckling load of the structure.The results show that: The ply angle between the patch and the flap has a direct effect on the buckling load of the structure. If the ply angle between the patch and the flap changes from 0 ° to 20 °, the buckling load can be increased by 6.8% and 2.4% respectively. The thickness of the sheet is also related to the buckling load of the structure, but it is not very satisfactory to increase the thickness of the existing sheet to increase the buckling load of the structure.When the thickness of the sheet is increased from 11 to 16, the buckling load also increases by only 2.37% , Considering the cost and weight factors, this method is not desirable compared with changing the ply angle.