复合材料层合圆柱壳体缓冲吸能的实验与模拟

根据复合材料层合圆柱壳体受轴向冲击作用下的动力学,通过准静态压缩实验对标准型和采用花瓣型引发方式的玻璃纤维增强复合材料(GFRP)层合圆柱壳体的缓冲吸能特性进行了研究,运用ANSYS/LS-DYNA基于Chang-Chang失效准则判断的模型对落锤冲击下复合材料层合圆柱壳体的动力响应过程进行了模拟,标准型复合材料层合圆柱壳体模拟的结果与关键性实验数据能较好地吻合,其中4ms时刻的速度、位移、加速度以及加速度峰值的误差分别为19.5%,12.0%,6.4%,14.6%.而花瓣型复合材料层合圆柱壳体在引发方式上的改进使得材料在比吸能上有所提高,而且能极大地降低初始荷载峰值并延长到达峰值所需的压溃位移长度.利用基于Chang-Chang失效准则判断的模型可准确模拟压溃过程和材料的失效现象.

Test and Simulation of Cushioning Energy-Absorbing Property of Composite-Laminated Cylindrical Shells

According to the kinetics of composite-laminated cylindrical shells subjected to axial impact loads, the cushioning energy-absorbing property of the standard and the petal-triggered GFRP (Glass Fiber-Reinforced Composite)-laminated cylindrical shells are investigated through the quasi-static compression test. Then, by setting up a material model which implements the Chang-Chang failure criterion, the dynamic response process of the shells under drop impact is simulated using ANSYS/LS-DYNA. The simulated results of the normal composite-laminated cylindrical shells accord well with the experimental ones in terms of some key characteristics, and the simulation errors of velocity, displacement, acceleration and peak acceleration are found to be 19.5%, 12.0%, 6.4% and 14.6%, respectively. Moreover, the improvement of triggering mode of the petal-triggered composite-laminated cylindrical shells increases the specific energy-absorbing value, greatly decreases the initial peak load, and prolongs the compression displacement for the peak load. It is thus concluded that the model based on the Chang-Chang failure criterion helps to precisely predict the crushing process and the failure of the material.