多次应力波作用下P-CCNBD岩样动态断裂的能量耗散特性研究

doi:10.13722/j.cnki.jrme.2017.1149

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Abstract In order to investigate the dynamic fracturing characteristics of rock under the loading of multiple stress waves，some marble specimens of 160 mm in diameter being pre-cracked chevron notched Brazilian disc (P-CCNBD) were tested diametrically by using the split Hopkinson pressure bar(SHPB) of 100 mm in diameter. The crack initiation and expansion process of specimens were measured with the crack propagation gauge and strain gauge. The dynamic fracturing and energy dissipation characteristics of specimens were analyzed. The results show that P-CCNBD specimens were fractured under loading of multiple stress waves due to 0.13 MPa impact pressure. The energy dissipation in the process of failure under a single stress wave and multiple stress waves were analyzed. The incident energy，reflected energy and dissipative energy of P-CCNBD specimens were reduced with the increasing of the loading times，but the total dissipation energy of P-CCNBD specimens increased with the increasing of loading times. Both the rate of energy dissipation and the dynamic fracture toughness of P-CCNBD specimens decreased with the increasing of loading times and satisfied the linear relationship approximately. Which helps to understand the dynamic fracture mechanism of rock under loading of multiple stress waves.

Key words： rock mechanics multiple stress waves loading pre-cracked chevron notched Brazilian disc (P-CCNBD) energy dissipation split Hopkinson pressure bar (SHPB)

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	Articles by authors
	LU Yiqiang1
	ZHANG Sheng2
	GAO Mingzhong1
	YIN Xiangang3
	LI Shengwei1
	LI Cong1
	HE Zhigqiang1

Cite this article:

LU Yiqiang1,ZHANG Sheng2,GAO Mingzhong1, et al. Experimental study on energy dissipation of dynamic fracture characteristics of P-CCNBD rock specimens under multiple stress waves[J]. , 2018, 37(5): 1106-1114.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1149 OR http://www.rockmech.org/EN/Y2018/V37/I5/1106

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