不同压溃速度下复合材料圆管吸能特性试验及数值模拟研究

Experimental and Numerical Simulation Research on the Energy Absorption Properties of Composite Circular Tubes at Different Crushing Velocities

复合材料除了比强度高、比刚度高等优点外,还具有良好的能量吸收能力。本文开展了复合材料圆管在2mm/min、0.5m/s、7.5m/s三个不同压溃速度下的吸能特性试验研究。研究结果表明,三种压溃速度下复合材料圆管表现出相同的破坏模式,且比吸能较为接近,率敏感性不显著。进一步开展了7.5m/s压溃速度下复合材料圆管吸能特性有限元数值模拟,模拟结果与试验结果一致。

Carbon fiber reinforced composites are widely used due to their advantages of high specific strength, high specific stiffness, and good energy absorption capacity. In this paper, the energy absorption properties of composite circular tubes under different crushing velocities are studied both experimentally and numerically. The tests on composite circular tubes are carried out under three axial crushing velocities of 2 mm/min, 0.5 m/s and 7.5 m/s respectively. It is found that the composite tubes show the same failure mode and the closed specific energy absorption at different loading velocities, which means the energy absorption capacity is not sensitive to the loading rate. The finite element model of the composite tube under the crushing velocity of 7.5 m/s is established, and the accuracy of the model is verified by the experimental results.