带口盖复合材料柱壳压缩性能

Compressive behavior of composite cylinder shell with cover

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 compressive behavior of one-third composite cylindrical shell with cover was studied. The composite cylinder shell with cover which was tested under compressive load failed in local buckling at 118. 944 kN without post-buckling. The finite element model was built in ABAQUS to calculate buckling be- havior of the composite cylindrical structure. The computational results were compared with experimental re- suits to verify the validity of this finite element model. The built finite element model was utilized to investigate the method of improving buckling load of the structure. The results show that the layer angles of patch and cov- er have directly effect on the buckling load. If the angle of patch and cover change from 0°to 20°, the structure buckling load will improve 6.80% and 2.39%. The thickness of patch also has effect on the buckling load. However, increasing thickness of patch is not an ideal method to improve buckling load. Because when the number of the layers increases from 11 to 16, buckling load only improves by 2.37%. Considering the cost and weight, it is not a wise choice compared with changing layer angle.