冲击载荷作用下脆性材料的失效波实验研究

为研究玻璃、陶瓷等脆性材料在冲击加载条件下的失效波问题,在一维应变条件下,采用VISAR测量了不同冲击载荷作用下A95氧化铝陶瓷和soda lime玻璃试件背面的粒子速度时间历程。结果显示:采用相同的实验方法,soda lime玻璃试件背面粒子速度时间曲线出现了表征失效波现象的再压缩信号,与文献[1,4,8-12,17-21]结果一致,而氧化铝陶瓷试件无此现象出现。这表明陶瓷与玻璃虽同为脆性材料,但是其破坏机制不尽相同,需要进一步开展研究。

Experimental Research on Failure Wave of Brittle Materials Under Shock Loading

In order to investigate the failure wave of brittle materials, such as glasses and ceramics, under dynamic compressive loading, the planar impact experiments of A95 alumina ceramic and soda lime glass were conducted under one-dimensional strain condition. The particle velocities on the rear surfaces of samples were acquired by using the VISAR technique. The results show that a re-compression signal on the temporal curve of soda lime glass which represents the occurrence of failure wave under certain pressure, which is agreement with many results in open literatures ［1,4,8-12,17-21］, but no re-compression signal exists on the temporal curve of alumina ceramic. This shows that the damage or fracture mechanisms of glasses and ceramics under shock loading may be different, which need more research in the future.