Experimental study on the I-type crack dynamic fracture of rock under impact load

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (11) : 49-53.

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Experimental study on the I-type crack dynamic fracture of rock under impact load

SONG Yi-min 1 YANG Xiao-bin 2 JIN Lu 1 YANG Sheng-xuan 1

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Abstract

The rock I type crack dynamic fracture test under impact load is carried out, in the test, digital speckle correlation method is used as the test observation method, the high-speed camera is used to construct experimental data acquisition system, and impact loading device is adjustable with different speed for the drop hammer impact test machine which is designed and developed by the author and cooperators. During the test, the displacement field evolution characteristics of the rock I-type crack propagation process were researched under impact load. Analyzing the experimental results, the rule of crack propagation rate and crack propagation distance varying with the time were obtained under impact load. The Crack Tip Opening Angle (CTOA) of rock I-type crack dynamic fracture was got quantitatively. At the same time, the relationship between crack propagation speed and different impact load of rock I-type crack were studied. The research results shown that the crack propagation rate increases with the increase of impact load velocity at the low and medium speed impact load case, and the relation of crack propagation rate and impact velocity is approximate linear.

Key words

low and medium speed impact load / dynamic fracture / white light digital speckle correlation method / Crack Tip Opening Angle (CTOA)

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SONG Yi-min YANG Xiao-bin JIN Lu YANG Sheng-xuan . Experimental study on the I-type crack dynamic fracture of rock under impact load [J]. Journal of Vibration and Shock, 2014, 33(11): 49-53