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.
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