平纹编织C/SiC复合材料低速冲击数值模拟

Numerical simulation on low-speed impact response of 2D plain-woven C/SiC composite

首先,基于空气炮装置进行了2D-C/SiC薄板在冲击速度为79~219m/s范围内的低速冲击实验,对碎片云团发展过程进行高速摄影记录;其次,基于Autodyn软件正交各向异性复合材料模型,推导2D-C/SiC材料相关参数;选取SPH求解器建立二维计算模型,对实验工况进行数值模拟,并基于碎片云结构、B扫描检测结果和碎片云轴向发展速度验证了该模型可以很好地描述C/SiC材料在冲击载荷作用下的脆性特征和软化行为。最后,基于数值模拟结果推导得出了钢弹丸冲击C/SiC材料的极限侵彻深度预测公式。

First, the experiments that the steel balls impact to 2D-C/SiC composite under velocity of 79- 219 m/s are investigated by using the air gun. Second, material parameters of 2D C/SiC are ob- tained based on an orthotropic constitutive material model in Autodyn, and numerical simulation cot responding to experimental conditions are conducted based on smooth particle hydrodynamics（SPH） solver. The comparisons between the calculation results and experimental data of the debris cloud structure, the B scan results and the axis velocity of debris cloudvalidate the ability of this model for describing the brittle characteristics and the softening behaviour of 2D C/SiC under impact load. Fi nally, the limit penetration depth of 2D C/SiC under the impact of steel bali is predicted.