波阻抗对岩石动力学特性影响的模拟试验研究

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Abstract A series of impact compression tests were conducted on model materials with different wave impedances under different strain rates using the split-Hopkinson pressure bar (SHPB) test system.The test results showed that under impact load, rock’s stress wave propagation characteristics, dynamic stress-strain relation and fractal features of rock fragmentation are affected by wave impedance, strain rate and impact velocity; when wave impedance is the same, amplitudes of reflected wave and transmitted one increase linearly with increase in impact velocity; at the same time, effect of strain rate is obvious, with increase in strain rate, peak stress increases linearly, dynamic elastic modulus increases, and strain softening stage prolongs; when crushing degree increases, fractal dimension of fragmentations increases linearly; when strain rate is the same, with decease in wave impedance, amplitude of reflected wave increases and transmitted one’s decreases; when peak stress decreases, strain softening stage prolongs, plastic stage tends to be obvious, and plastic flow phenomenon appears; when crushing degree increases, fractal dimension of fragmentations increases; with decrease in wave impedance, effect of increase in strain rate on increase in dynamic anti-compression intensity and enhancing degree of crushing weakens, strain rate’s effect weakens and gradually tends to be unconspicuous.

Key words： wave impedance strain rate split Hopkinson pressure bar (SHPB) stress wave dynamic performance fractal dimension of fragmentation

Received: 09 August 2018 Published: 28 January 2020

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	Articles by authors
	YANG Renshu1
	2
	LI Weiyu1
	FANG Shizheng1
	ZHU Ye1
	LI Yongliang1
	2
	ZHENG Changda1

Cite this article:

YANG Renshu1,2,LI Weiyu1, et al. Tests for effects of wave impedance on rock’s dynamic performance[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(3): 178-185.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I3/178

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