引发角对碳纤维/环氧复合材料圆管件轴向压溃性能的影响

Influence of Trigger Mechanism on Axial Crashing Behavior of Carbon/Epoxy Circular Tubes

研究了碳纤维增强高韧环氧树脂5288复合材料薄壁圆管件的轴向压溃行为和引发角尺寸之间的关系。对15°,45°,60°引发角的相同尺寸试件分别进行轴向压溃试验,记录了试验过程中的结构载荷力-位移曲线,对照各组不同引发角的管形件轴向压溃过程的峰值压溃载荷、最小压溃载荷后发现,当引发角为60°时,结构的峰值压溃载荷最高,最小压溃载荷最低。对试验件失效后组织进行微观分析后发现,对应于不同引发角,由于接触状态不同,圆管件发生了不同方式的压溃失效,导致了结构吸能力-位移曲线的变化。

The effects of trigger geometry on axially crashing behavior of carbon/epoxy composite circular tubes were investigated. The results showed that in axial crushing experiments, among 15°, 45°, 60° of the trigger geometry, 60° got the highest crashing peak load and the lowest crashing minimum load. The morphology analysis on the crushed tubes showed that the different trigger geometry led to different crashing microstructures failure for the reason on different contact conditions during crashing processing of the circular tube. As a result, the energy absorbing characteristic was deeply influenced by the trigger geometry.