Study on Behaviors of Dynamic Fracture in Layered Rock under Impact Loading

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (12) : 223-229.

YUE Zhongwen SONG Yao CHEN Biao WANG Xu QIU Peng

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Abstract

By using specimens consisting of polymethyl methacrylate(PMMA) and epoxy resin, the dynamic three-point bending caustic experiments under impact loading were performed to study the fracture behaviors of layered rock. The results are shown as follows. Cracking deviation happens on the bedding surface during the fracture process, which causes the crack cannot develop directly through the surface along the original path. The offset is influence by the angle between the pre-existing crack and the bedding surface. With the angle increasing, the offset gets more evident; when the angle is less than 90°, only one deviation crack generates on the bedding surface; for the angle of 90°, two deviation cracks, of which the propagation paths are almost symmetric, generate on the bedding surface. The dynamic stress intensity factor and propagation velocity v of crack tip decline gradually with the decrease of the distance between the bedding surface and crack tip, indicating that bedding surface shows crack resistance effect and such effect grows stronger with the increase of the angle between pre-existing crack and the bedding surface.

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caustic / layered rock / impact loading / dynamic stress intensity factor

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YUE Zhongwen SONG Yao CHEN Biao WANG Xu QIU Peng . Study on Behaviors of Dynamic Fracture in Layered Rock under Impact Loading[J]. Journal of Vibration and Shock, 2017, 36(12): 223-229

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