摘要
本文对不同加载率（Ｋ＝ｌ０￣０～１０￣６ＭＰａｍ￣（１／２）ｓ￣（－１））条件下断裂的辉长岩短棒试件的断裂面进行了分维测量。结果表明，在静态或准静态加载条件下的断裂面分维数近似为一个常数，但在动态（冲击）加载时，分维数随着加载率的增加而明显增加。这与辉长岩断裂韧度随加载率的变化规律一致。由比发现辉长宕断裂韧度与断裂面分继数有良好的指数函数关系。这说明通过辉长岩断裂面的分维数测量与分析，有可能直接获得断裂韧度值以及断裂时经受的加载率等数据。
The fractal dimension D_F of fractured surfaces of short gabbro rod specimens, which fractured at the rates K=10￣1-10￣6MPam￣(1/2)s￣(-1) ,is measured.The results show that under static or quasi-static loading the fractal dimension DF is nearly a constant, but under dynamic(impact)loading the DF obviously increases with the loading rates.This result consists with the relation between gabbro fracture toughness and loading rate,According to the above, it is found that the gabbro fracture toughness is a good exp...
出处
《有色金属》
CSCD
1995年第2期1-5,共5页
Nonferrous Metals
关键词
岩石断裂韧度
加载率
分形几何
动态断裂
辉长岩
rock fracture toughness
loading rates
fractal geometry
dynamic fracture
gabbro
