The present article discusses the effect of impact damage on residual compressive strength of aluminum alloy honeycomb sandwich panel (HSP). Multiple dents were created in HSP by penetrating indenters of different diameters through quasi-static indentation technique. The damaged samples were compressed edge-wise for determination of in-plane compression after impact (CAI) strength. The failed samples were macroscopically examined to reveal the underlying damage mode. Experimental results showed that the presence of multiple dents of 5 mm size or less do not appreciably affect the CAI strength of aluminum alloy HSP. However, moderate reduction in CAI strength was observed in case of multiple dents of 10 mm. Compressive strength was reduced by 18% in presence of four dents of 10 mm diameter. The maximum reduction in CAI strength of up to 30% was observed in samples impact damaged by 15 mm indenter. Examination of failed HSP showed that the maximum load was sustained taken by aluminum facesheet whereas the contribution of honeycomb core was insignificant. Research findings exhibit that the CAI strength of aluminum alloy honeycomb structure is not sensitive to impact damages size less than 5 mm diameter however dents above 5 mm size can seriously impair mechanical performance and structural integrity.

本文讨论了冲击损伤对铝合金蜂窝夹芯板（HSP）残余抗压强度的影响。通过准静态压痕技术穿透不同直径的压头，在 HSP 中产生多个凹痕。将损坏的样品沿边缘压缩，以确定冲击后的面内压缩 (CAI) 强度。对失败的样品进行宏观检查以揭示潜在的损坏模式。实验结果表明，5mm 或更小的多个凹痕的存在不会明显影响铝合金 HSP 的 CAI 强度。然而，在 10 毫米的多个凹痕的情况下，观察到 CAI 强度适度降低。存在四个直径为 10 毫米的凹痕时，抗压强度降低了 18%。在被 15 毫米压头损坏的样品中观察到 CAI 强度的最大降低高达 30%。对失败的 HSP 的检查表明，最大负载由铝面板承受，而蜂窝芯的贡献微不足道。研究结果表明，铝合金蜂窝结构的 CAI 强度对小于 5 毫米直径的冲击损伤不敏感，但大于 5 毫米的凹痕会严重损害机械性能和结构完整性。