T700／QY8911复合材料圆管轴压下能量吸收研究

采用T700／QY8911预浸料热压成型制作了复合材料圆柱管，对其进行了轴向压缩下能量吸收性能的试验。通过试验得到了峰值载荷、平均压溃载荷和比吸能率等主要能量吸收性能参数。试验结果表明，能量吸收性能及压溃破坏模式不仅与碳纤维材料性能有关，还与成型工艺及端部减薄这一薄弱环节设置密切相关；端部减薄薄弱环节的设置能有效地降低圆柱管在压溃过程中的峰值载荷，渐进地引发圆柱管压溃失效。建立了复合材料圆管轴向渐进损伤压缩有限元模型，通过计算得到了能量吸收性能的重要参数，计算结果与试验结果比较吻合说明了所采用的模拟方法是可行的。

Researches on Energy Absorption of Composite Tube Made of T700/QY8911under Axial Compressions

Quasi-static axial compression tests were performed on composite circular tubes fabricated by tharmosetting prepreg of 3700/ QY8911 to study their energy absorption characteristics. The main energy absorption parameters, such as peak load,mean crushing load and specific energy absorption, are obtained by experiments. It is found that the energy absorption characteristic and crushing damaged mode depend not only on carbon fiber property, but also on the manufacturing process and trigger mechanism with end weakness on tubes. The trigger mechanism herein could effectively reduce peak load, and make composite tubes crush progressively. A progressive damage finite element model is established and the energy absorption characteristics are obtained by the FE analysis. The computed data agree with experimental resuits, thus indicates the simulation method is feasible.