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采用商业有限元软件ABAQUS对盒段的后屈曲承载能力进行了分析,重点研究了在弯扭载荷条件下后屈曲诱发的盒段蒙皮/缘条界面的失效问题。在此基础上,采用缝线对墙缘条与蒙皮的界面进行增强,应用粘接元模拟缝线,研究缝线对复合材料多墙盒段的破坏模式和承载能力的影响,并对缝线增强后的盒段的承载能力进行了试验研究。有限元分析表明,复合材料多墙盒段具有较长的后屈曲历程,采用缝线增强技术能够明显改善盒段的后屈曲承载能力,预测结果与试验值吻合良好,而且预测的失效模式也与试验结果一致。
The commercial finite element software ABAQUS was used to analyze the post-buckling load-bearing capacity of box sections. The failure of post-buckling-induced skin-skin / edge interface was mainly studied under bending and torsional loading conditions. On the basis of this, the interface between the wall rim and the skin is reinforced by using sutures. The effect of the suture on the failure mode and the bearing capacity of the multi-wall box with composite materials is studied by using the adhesive element simulation suture. The experimental study on the carrying capacity of the box after the line enhancement is carried out. Finite element analysis shows that the composite multi-wall box has a long post-buckling process, and the suture reinforcement technology can significantly improve the post-buckling bearing capacity of the box. The predicted results are in good agreement with the experimental values, and the predicted failure modes The test results are consistent.