Research on dynamic characteristics of Shanxi black granite under high strain rates

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (8) : 177-182.

JIANG Feng1,2, LI Zi-mu1, LIU Qing-feng1, GUO Hua1, XU Xi-peng1

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Abstract

A series of dynamic compression tests of Shanxi black granite under different strain rates (315.53s-1~1349.87s-1) have been carried out with Split Hopkinson Pressure Bar. Dynamic compressive strength of Shanxi black granite increased from 272.33MPa to 371.78MPa when strain rate increased from 460.09s-1 to 860.20s-1. The fracture mechanism of Shanxi black granite with high strain rates is volume fracture in the initial impact region of the shock wave and Hertzian fracture in the second half of the cylinder sample. The elastic-plastic deformation energy per unit volume of Shanxi black granite decreased with strain rate increasing. Material failure and crack propagation absorb more energy during the impact with higher strain rate, which results in severer fracture of granite material.

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dynamic property of rock / Shanxi black granite / split Hopkinson pressure bar / high strain rate / fracture mechanism

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JIANG Feng1,2, LI Zi-mu1, LIU Qing-feng1, GUO Hua1, XU Xi-peng1. Research on dynamic characteristics of Shanxi black granite under high strain rates[J]. Journal of Vibration and Shock, 2016, 35(8): 177-182

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