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<p>This study focuses on T700 composite bolted single-lap joints, systematically investigating how varying impact energies and locations affect the connection performance of bolted structures. The energy value for altering the failure modes of single-lap joints is explored through experimental methods. A high-precision numerical model is established to analyze the damage mechanism of the failure behavior in CFRP bolted single-lap joints after impact. The results indicate that, when the impact energy exceeds 25&#xa0;J at location A, the failure load of the test specimen significantly decreases, with a reduction rate exceeding 15.49%. The primary failure mode transitions from bearing failure to a delamination-dominated mixed failure, and the bolt tilting angle during failure will change obviously. Under impact with energy of 25&#xa0;J, the failure load exhibits significant regional variations in the bolted single-lap joints. In which, the lap zone demonstrates optimal residual performance with only a 2.65% reduction, while the lower plate exhibits the most severe degradation, experiencing a 23.96% decrease. This study can provide critical insights for damage-tolerant design of composite bolted joints in aerospace structural applications.</p>

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Residual Connection Performance Degradation and Failure Mode Transition in CFRP Bolted Single-Lap Joints Under Low-Velocity Impact

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Yongshun Chen,
  • Jie Zeng,
  • Haijin Wang,
  • Han Wang,
  • Yongliang Zhang,
  • Yunbo Bi

摘要

This study focuses on T700 composite bolted single-lap joints, systematically investigating how varying impact energies and locations affect the connection performance of bolted structures. The energy value for altering the failure modes of single-lap joints is explored through experimental methods. A high-precision numerical model is established to analyze the damage mechanism of the failure behavior in CFRP bolted single-lap joints after impact. The results indicate that, when the impact energy exceeds 25 J at location A, the failure load of the test specimen significantly decreases, with a reduction rate exceeding 15.49%. The primary failure mode transitions from bearing failure to a delamination-dominated mixed failure, and the bolt tilting angle during failure will change obviously. Under impact with energy of 25 J, the failure load exhibits significant regional variations in the bolted single-lap joints. In which, the lap zone demonstrates optimal residual performance with only a 2.65% reduction, while the lower plate exhibits the most severe degradation, experiencing a 23.96% decrease. This study can provide critical insights for damage-tolerant design of composite bolted joints in aerospace structural applications.