低速冲击下碳/玻混杂复合材料红外辐射特征

Infrared radiation characteristics of carbon/glass hybrid composites under low-velocity impact

碳/玻混杂复合材料在工业应用中表现出巨大的应用潜力。基于红外热像法试验研究了碳/玻混杂复合材料层压板与2种非混杂材料低速冲击下的红外辐射特征。通过目视、超声C扫描和光学显微镜等方法确定冲击后层压板的损伤模式,分析热图序列的时序变化特征和温度分布特征,从而表征冲击过程中的热耗散效应。结果表明:红外热成像技术非常适合监测低速冲击下纤维增强复合材料的损伤过程,通过热图序列可以建立起监测特征与各损伤模式之间的联系;同时发现碳/玻纤维的层间混杂可有效提升碳纤维强基复合材料(CFRP)的抗分层能力,随着冲击能量增加其抗分层能力愈加明显,冲击后的碳/玻混杂复合材料兼具较大的表面损伤和较小的分层损伤,拥有较好的损伤容限。

Carbon/glass hybrid composites have shown great potential in industrial applications.The infrared radiation characteristics of carbon/glass hybrid composite laminates and two types of non-hybrid composites under low velocity impact were studied experimentally by infrared thermography.The damage mode of the laminates was determined after impact by visual,ultrasonic C-scan and optical microscopy,and then the time series variation and temperature distribution characteristics of the thermal map sequence were analyzed to characterize the heat dissipation effect during the impact.Results show that the infrared thermography is highly suitable for monitoring the damage process of fiber reinforced composites under low velocity impact,and that the relationship between the monitoring characteristics and the damage modes can be established through the thermal map sequence.It is also found that the interlaminar hybrid of carbon glass fibers can effectively improve the anti-delamination ability of carbon fiber reinforced polymer(CFRP)composites.With the increase of impact energy,the anti-delamination ability becomes more obvious.After impact,carbon glass hybrid composites show both larger surface damage and smaller delamination damage with better damage tolerance.