诱导角及铺层结构对碳/环氧复合材料薄壁管轴向压溃吸能特性的影响

Effect of Trigger and Stacking Structures on Energy Absorption of Carbon Fiber/Epoxy Tubes Under Axial Compression

以单向碳纤维/环氧树脂预浸料为原料,通过卷绕铺层、热压成型工艺,制备单向及0°/90°卷绕复合材料薄壁管。对薄壁管试样头端进行不同形式的倒角处理,研究诱导角及卷绕结构对复合材料薄壁管吸能性能的影响,并通过金相观察,探究复合材料薄壁管微观损伤失效行为。研究发现:0°/90°卷绕薄壁管较单向薄壁管具有更优异的吸能性;不同诱导角直接影响初始诱导压溃过程,从而决定后续渐进稳定的压溃全过程;压溃过程中侧叶以较小曲率向管内和管外弯曲,侧叶易出现分层及纤维断裂,对薄壁管吸能具有积极作用。

Carbon fiber(CF)as reinforcement and epoxy as matrix are employed to manufacture CF/epoxy composite tubes with unidirectional and 0°/90°stacking structures through wrapping and heat press curing processes.The energy absorption of those composite tubes with different triggers is investigated through the axial compression tests.The effects of trigger and stacking structures on the crashworthiness of composite tubes are discussed.Meanwhile,the failure behavior is analyzed by optical observations on the micro damage propagation in cross section.The findings are that 0°/90°wrapping composites tubes with 90°oriented hoop fibers exhibit better energy absorption capability than that of unidirectional composite tubes with same trigger.The initial crushing behavior is affected by the trigger,which plays a significant role in the following progressive and stable crushing process.During the crushing process,more delamination and fiber breakage occur in fronds with smaller bending curvature that facilitate the energy absorption of composite tubes.