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<p>This study experimentally investigated the coupled impact-tension response of CFRP/Al Flat-Joggle-Flat (FJF) adhesive joints under 10&#xa0;J, 20&#xa0;J, and 30&#xa0;J impact energies, and systematically elucidated the damage mechanisms and performance evolution of FJF joints. The key innovative findings are summarized as follows. A pronounced “impact surface effect” was discovered in dissimilar-material joints. When aluminium served as the impacted surface, the peak contact force increased by 10.5%, whereas impact on the CFRP preserved a significantly higher residual load-bearing capacity. The coupled influence of impact energy and impact surface on failure-mode transitions was quantitatively established for the first time. Under impact energies of 10&#xa0;J and 20&#xa0;J on the CFRP, failure was primarily characterized by delamination and fiber tearing; at 30&#xa0;J, the dominant failure shifted to a mixed mode consisting of cohesive failure within the impact zone accompanied by approximately 51.9% fiber tearing in the non-impacted region. Impact on the aluminum alloy exhibited a consistent failure pattern across all energy levels, characterized by cohesive failure in the adhesive layer within the impact zone along with fiber tearing in non-impact regions. Moreover, continuous recordings during tensile failure were employed to reveal the initiation and propagation of damage. This work delivers the first quantitative experimental data and failure mechanism analysis for dissimilar FJF joints under impact-tension, guiding crashworthy design of rail-vehicle multi-material joints.</p>

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Experimental Study on the Tensile Failure of Novel CFRP/Al Flat-Joggle-Flat Joints for Rail Vehicles After Impact

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • QingXin Gao,
  • ZhiMing Liu,
  • Guangxue Yang,
  • Hua Zou,
  • TianYu Zheng,
  • Yangyang Yu,
  • Yeheng Song

摘要

This study experimentally investigated the coupled impact-tension response of CFRP/Al Flat-Joggle-Flat (FJF) adhesive joints under 10 J, 20 J, and 30 J impact energies, and systematically elucidated the damage mechanisms and performance evolution of FJF joints. The key innovative findings are summarized as follows. A pronounced “impact surface effect” was discovered in dissimilar-material joints. When aluminium served as the impacted surface, the peak contact force increased by 10.5%, whereas impact on the CFRP preserved a significantly higher residual load-bearing capacity. The coupled influence of impact energy and impact surface on failure-mode transitions was quantitatively established for the first time. Under impact energies of 10 J and 20 J on the CFRP, failure was primarily characterized by delamination and fiber tearing; at 30 J, the dominant failure shifted to a mixed mode consisting of cohesive failure within the impact zone accompanied by approximately 51.9% fiber tearing in the non-impacted region. Impact on the aluminum alloy exhibited a consistent failure pattern across all energy levels, characterized by cohesive failure in the adhesive layer within the impact zone along with fiber tearing in non-impact regions. Moreover, continuous recordings during tensile failure were employed to reveal the initiation and propagation of damage. This work delivers the first quantitative experimental data and failure mechanism analysis for dissimilar FJF joints under impact-tension, guiding crashworthy design of rail-vehicle multi-material joints.