陶瓷中失效波现象的实验研究

为确定陶瓷材料中是否存在表征失效波的再压缩信号这一实验现象,开展了一维应变条件下平板撞击实验,采用VISAR系统测得了不同厚度试件的自由面粒子速度时程曲线. 通过计算分析,曲线上的再压缩信号皆来自于飞片与试件碰撞面处的反射,而非来自于试件内部某处破坏阵面的反射. 此结果表明陶瓷中没有出现表征失效波现象的再压缩信号. 实验中采用抛光陶瓷试件表面作为激光反射面,以避免试件表面镀铝膜对实验结果的影响.

The Investigation of The Failure Wave in Ceramics

To confirm whether there is the recompression signal in ceramics experiment which characterizes the failure wave, one-dimension strain plate impact experiments were conducted, and the free-surface particle velocity-time curves from the different thicknesses specimens were obtained by the VISAR system. The analyzed results show that the recompression signals on the particle velocity curves are all reflected from the interface between the flyer and the specimen rather than somewhere of the internal failure boundary in specimen. It is verified that there is no characteristic signal of failure wave in ceramic experiments. Moreover, the ceramic specimens used in the experiments were polished to reflect the laser well in order to avoid the influence caused by the aluminum coating on the specimen surface.