【摘要】 岩石在高应变率下的动力学性能研究在国防和民用建设中具有重要意义。在57mm气炮上利用电磁法研究了蓝田花岗岩冲击压缩特性。采用正向冲击法和反向冲击法两种实验构形,冲击压力范围为78MPa～5.2GPa。蓝田花岗岩声学特性和动力学特性与其他花岗岩有较大差别,其Hugoniot曲线在约0.47GPa时有明显的拐折,这与球形波实验的相应结果基本一致。由于蓝田花岗岩具有明显的铁磁效应,在冲击波作用下激发强电磁场,这会严重干扰测量波形。反向冲击法可以有效地减少这种干扰,其在研究岩石类特殊材料的冲击压缩特性时有明显的优点。更多还原

【Abstract】 The testing study on dynamic property of rock under high strain rate is of important significance for national defence and civil construction. The testing data of Hugoniot are presented for Lantian granite under pressure range of approximately 78 MPa to 5.2 GPa. The test was conducted on a single-stage light gas gun of 57 mm. The general impact experimental configuration and the reverse ballistic experimental configuration with electro-magnetic particle velocity gage were used to obtain shock velocity and particle velocity. Lantian granite is different with others in acoustics and dynamics. There is a corner for the relation between shock velocity and particle velocity under about 0.47 GPa, and the result is well in accord with that of spherical divergent wave in Lantian granite. The ferromagnetic effect of Lantian granite is very strong. Electromagnetic field is excitated by shock wave. The electromagnetic field can severely disturb particle velocity signals. The reverse ballistic experimental configuration can effectively decrease the disturbanc and it is a very good method for testing study on the dynamic property of rock更多还原