Experimental study on the blasting dynamic caustics under different charge weight based on the fractal theory

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 80-86.

YANG Renshu1,2，XIAO Chenglong1,3，CHEN Cheng1,3，DING Chenxi1,3，ZHENG Changda1,3，ZHAO Yong1,3，ZHAO Zhiwei1,3

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Abstract

In order to study the effect of charge on the crack propagation behavior of the crack, a dynamic caustic experiment system was used to study the expansion law of cracks in different charges. Based on the calculation principle of box-counting dimension, the MATLAB program is written to calculate the fractal dimension of the crack. Researches show that: (1) The propagation of cracks have two stages, stage I (0 ~ 114.3μs) is the effect of explosive stress wave and explosive gas on the crack tip, at the moment of crack initiation, the expansion speed reaches a peak and then rapidly decreases; stage II (114.3μs ~ crack arrest) ,the crack propagation speed continues to increase under the action of the reflected stress wave on the crack tip. (2) Crack growth rate peak、dynamic stress intensity factor peak、area of crushing area、fractal dimension of crack is positively correlated with the charge. (3) Through the regression analysis and Linear fitting, the linear relationship between the crack propagation velocity and the fractal dimension of the crack propagation trajectory is obtained. The evolution of the same crack propagation velocity conforms to the fractal law.

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dynamic caustics / explosive loading / crack propagation behavior / charge weight / fractal dimension

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YANG Renshu1,2，XIAO Chenglong1,3，CHEN Cheng1,3，DING Chenxi1,3，ZHENG Changda1,3，ZHAO Yong1,3，ZHAO Zhiwei1,3. Experimental study on the blasting dynamic caustics under different charge weight based on the fractal theory[J]. Journal of Vibration and Shock, 2020, 39(14): 80-86

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