To enhance the residual energy‐absorption (EA) of low-velocity impact-damaged CFRP square tubes, this study investigates the influence of stacking angles on the damaged tubes' residual EA. Through simulation and theoretical analysis, a well-designed stacking angles is proposed to optimize the residual EA. Initially, a simplified method of low-velocity impact damage of composite materials is proposed, by which a discontinuous damage mechanics finite element model is established and experimentally verified. Subsequently, various layup sequences are examined, and their impact on energy absorption is evaluated using several performance indices, including initial peak load, average load, energy absorption, specific energy absorption, and crushing load efficiency. The findings demonstrate that the designed stacking angles significantly enhances the residual energy absorption of low-velocity impact-damaged square tubes. Moreover, the study verifies the efficacy of the stacking angles design by investigating actual damage conditions, encompassing factors such as damage size, location, and stress concentration.

中文翻译：

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考虑低速冲击损伤时堆放角度对CFRP方管耐撞性的影响

为了提高低速冲击损伤CFRP方管的残余能量吸收（EA），本研究研究了堆叠角度对受损管残余能量吸收的影响。通过仿真和理论分析，提出了精心设计的堆叠角度来优化残余 EA。首先提出了复合材料低速冲击损伤的简化方法，建立了不连续损伤力学有限元模型并进行了实验验证。随后，检查各种铺放顺序，并使用几个性能指标评估它们对能量吸收的影响，包括初始峰值负载、平均负载、能量吸收、特定能量吸收和破碎负载效率。研究结果表明，设计的堆叠角度显着增强了低速冲击损坏方管的残余能量吸收。此外，该研究通过调查实际损伤情况（包括损伤大小、位置和应力集中等因素）验证了堆叠角度设计的有效性。