纤维缠绕角度对CFRP-Al混合圆管横向受载性能影响

基于准静态横向弯曲试验对缠绕工艺下制备的CFRP/Al混合圆管进行抗弯性能和吸能特性研究,分析了混合圆管的破坏模式,基于不同纤维缠绕角度的碳纤维复合材料-铝合金混合圆管三点弯曲试验结果,通过有限元仿真方法研究了内层纤维缠绕角度对其横向抗弯与吸能特性的影响。试验结果表明,CFRP-Al混合圆管横向载荷下的失效形式、损伤模式与纯铝管基本保持一致,但受纤维缠绕角度的影响失效形貌略有差异。纤维缠绕角度越小,CFRP-Al混合圆管的抗弯性能和吸能性越好,同时压溃效率(CFE)明显降低。基于验证的有限元模型,研究不同角度纤维缠绕内层对于表层纤维层的应力传递影响,小角度缠绕内层对于管件的轴向拉伸变形抑制增加了管件整体峰值载荷与吸能作用,大角度缠绕内层对于管件环向刚度的提升增加了整体压溃效率。依此分析可为合理设计CFRP-Al混合管提供有效依据。

Effect of Filament Winding Angle on Bending Performance of CFRP-Al Circular Tube

Based on the quasi-static transverse bending test, the bending resistance and energy absorption characteristics of CFRP/Al hybrid tube manufactured by winding process were studied, and the failure modes of the hybrid tube were analyzed. Based on the three-point bending test results of CFRP-Al hybrid tube with different filament winding angles, the influence of filament winding angle on its transverse bending resistance and energy absorption was studied by finite element simulation method. The experimental results showed that the failure modes and damage modes of CFRP-Al hybrid tube under transverse load are basically the same as those of pure aluminum tube, but the failure morphologies are slightly different under the influence of filament winding angle. The smaller the filament winding angle, the better the bending resistance and energy absorption of CFRP-Al hybrid tube, and the lower the crushing efficiency (CFE). Based on the validated finite element model, the effect of different angle filament winding inner layer on the stress transfer of surface filament layer is studied. The restraint of small angle filament winding inner layer on the axial tension deformation of the tube increases the peak load and energy absorption of the whole tube, and the improvement of ring stiffness of the tube by large angle filament winding inner layer increases the overall crushing efficiency. The analysis can provide an effective basis for the reasonable design of CFRP-Al hybrid tube.