引发机制对复合材料波形梁吸能性能的影响及其破坏形貌分析

复合材料正弦波形梁作为复合材料结构2功能一体化的典型构件 , 在结构高强、 高刚和稳定的前提下 ,其压溃峰值应力和稳态损毁吸能行为是设计结构件的关键性能指标 , 而这两个指标与梁的引发机制密切相关。本文中设计了根部打孔削弱机制、 根部预埋倒角机制、 根部非对称梯度削弱和根部对称梯度削弱机制等 3 种不同引发机制 , 通过对正弦波形梁的静态压溃实验及对压溃梁的宏观和微观形貌分析 , 发现引发机制对正弦波形梁的失效引发和稳态损毁模式影响很大 , 根部预埋倒角正弦波形梁的失效引发和稳态损毁吸能效果最好。

Effects of triggers on the energy absorption behavior of sine-wave beam and the crush morphology

The composite sine-wave beam is a typically function-integrated structure for energy absorption application. The crushing peak stress and the progressive mean stress associated to the specific energy absorption ratio are critical for the function. Both of them are controlled significantly by the trigger system embedded in the beam. In this study, three trigger systems were designed and manufactured including an end bore weakened, chamfer weak- ened and gradient weakened beam, respectively. The crush experiments and the macro- and micro structural studies showed that the different triggers greatly affected the peak stress, the mean stress and the crush mechanism. The end chamfer weakened trigger exhibited the relatively best energy absorption behavior characterized by the peak stress, mean stress and the specific energy absorption ratio.