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In this paper, a prediction method for oblique compression instability of CFRP/aluminum alloy hybrid structure is proposed. Firstly, a quasi-static compression finite element model of CFRP/aluminum alloy hybrid thin-walled tube was established. Then, the deformation modes of thin-walled tubes under oblique loads were summarized and a criterion for determining the instability of hybrid tubes under oblique compression was proposed. Furthermore, an instability angle prediction model was established, and the influence of critical instability angle on the energy absorption characteristics of hybrid multi-cell tubes was analyzed. The results indicate that as the critical instability angle increases, the comprehensive energy absorption of the composite tube shows a decreasing trend. The comprehensive energy absorption of the hybrid tube with a critical angle of 40° is only 73.76% of that of the hybrid multi-cell tube with a critical angle of 20°. Therefore, in the design process of hybrid tube, the minimum critical instability angle should be selected as the design objective while ensuring that the maximum load angle is not unstable, in order to obtain the optimal energy absorption characteristics of hybrid multi-cell tube.

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Research on the Prediction of Oblique Compression Instability and Lightweight Design Method of CFRP/Al Hybrid Multi-cell Tube

  • 会议论文

  • 发表日期：

    2026年

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  • Baichuan Liu,
  • Hongyu Liang,
  • Dengfeng Wang

摘要

In this paper, a prediction method for oblique compression instability of CFRP/aluminum alloy hybrid structure is proposed. Firstly, a quasi-static compression finite element model of CFRP/aluminum alloy hybrid thin-walled tube was established. Then, the deformation modes of thin-walled tubes under oblique loads were summarized and a criterion for determining the instability of hybrid tubes under oblique compression was proposed. Furthermore, an instability angle prediction model was established, and the influence of critical instability angle on the energy absorption characteristics of hybrid multi-cell tubes was analyzed. The results indicate that as the critical instability angle increases, the comprehensive energy absorption of the composite tube shows a decreasing trend. The comprehensive energy absorption of the hybrid tube with a critical angle of 40° is only 73.76% of that of the hybrid multi-cell tube with a critical angle of 20°. Therefore, in the design process of hybrid tube, the minimum critical instability angle should be selected as the design objective while ensuring that the maximum load angle is not unstable, in order to obtain the optimal energy absorption characteristics of hybrid multi-cell tube.