碳纤维复合材料层压板低速冲击损伤性能分析

Analysis on low-velocity impact damage properties of carbon fiber composite laminates

对碳纤维复合材料层压板进行低速冲击和冲击后压缩(CAI)试验。通过不同等级的冲击能量与凹坑深度和损伤面积的关系研究层压板低速损伤特性,分析冲击损伤形貌和拐点产生的原因,对冲击后剩余强度和压缩失效行为进行分析。结果表明:随冲击能量增加,凹痕深度在35 J前增加缓慢,35 J后急剧增加,65 J时达穿透性损伤。冲击损伤形貌均为冲击表面产生凹坑和裂纹,冲击背面产生纤维断裂和基体开裂。损伤面积随冲击能量增加而增大,剩余压缩强度随冲击能量增加而减小,但幅度均有减缓趋势。试样冲击压缩后的破坏形貌以纤维挤压、纤维断裂和层压板的层间分层为主。相关试验结果和现象可为后续研究新型国产碳纤维复合材料提供数据参考。

The low-speed impact and post impact compression(CAI)tests of carbon fiber composite laminates were carried out.Through the relationship between impact energy of different levels and damage area,the low-velocity damage characteristics of laminates were studied,and the causes of impact damage morphology and inflection point were analyzed.The residual strength and compression failure behavior after impact were analyzed.The results show that with the increase of impact energy,the pit depth increase slowly before 35 J,and the pit depth increase sharply after 35 J,and reaches penetrating damage at 65 J.The impact damage morphology is pits and cracks on the impact surface,fiber fracture and matrix cracking on the impact back.The damage area increases with the increase of impact energy,and the residual compressive strength decreases with the increase of impact energy,but their amplitudes tend to slow down.The failure morphology of the specimen after impact compression is mainly fiber extrusion,fiber fracture and interlayer delamination of the laminate.The relevant test results and test phenomena in this paper can provide a data reference for the follow-up study of new domestic carbon fiber composite materials.