Estimation of Dynamic Tensile Strength of Rock Sample Loading under Water Shock Wave
A series of dynamic tests of rocks have been carried out using underwater shock waves. Emulsion explosive was used as source of the dynamic loading, and a pipe filled with water is arranged between the explosive and a cylindrical specimen. Kimachi sandstone was used as the rock specimen. The length of the pipe is varied to produce different strength of the incidence shock wave into the specimen. The velocity at the free end of the specimen and the position of a crack are observed using a laser vibration meter and a high-speed camera, respectively. A simple method of estimating dynamic tensile strength has been proposed with consideration of those experimental results. The complete velocity profile at the free end without fracture information is required in this method and is completely constructed under a simple assumption. The point at which the crack may be markedly activated has been defined by the velocity profile at the free end as the fracture activation point. Instead of the fragment size, the distance from the free end to the fracture activation point is employed for estimating the dynamic tensile strength. The dynamic tensile strength of the Kimachi sandstone have obtained by a new method under the 10～40-1 strain rate conditions.
dynamic tensile strength free surface velocity sandstone emulsion explosive underwater shock wave
Yuji OGATA Shiro KUBOTA Yuji WADA Ganda SIMANGUNSONG
Research Center for Explosion Safety, National Institute of. Advanced Industrial Science and Technology, Ibaraki, Japan
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
62-67
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）