Fractal characteristics of rock fragmentation at strain rate of 100-102s-1①
来源期刊：中南大学学报(英文版)2006年第3期
论文作者：周子龙 李夕兵 左宇军 洪亮
文章页码：290 - 294
Key words：SHPB test; rock fragmentation; fractal; damage; renormalization
Abstract: The fragmentation test of granite subjected to strain rate of 100102s-1was carried out using split Hopkinson pressure bar(SHPB) whose diameter is 75 mm, where half-sine loading waveform was performed. The sieving statistics results of the fragments show that the distribution of the fragments is a fractal, and the fractal dimension values fall into the range of 1.2 2.4. The correlation analysis between the fractal dimension and the logarithm of the energy density shows that they have approximately linear relation. Finally, based on damage theory and scale invariant principle, the fragmentation model with renormalization method was put forward, and the fractal dimension value predicted with the model was compared with the test results. It is found that the fractal dimension value obtained from the improved fragmentation model is more reasonable.
