Comments on the mode II fracture from disk-type specimens for rock-type materials

doi:10.1016/j.engfracmech.2019.02.024

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Comments on the mode II fracture from disk-type specimens for rock-type materials
	Lin, Qing ; Ji, Wei-Wei ; Pan, Peng-Zhi ; Wang, Siqi ; Lu, Yunhu
刊名	ENGINEERING FRACTURE MECHANICS
	2019
卷号	211 期号:-页码:303-320
关键词	Mode II fracture toughness Digital image correlation (DIC) Self-similarity Maximum tangential stress Stress intensity factor Disk-type specimen
ISSN号	0013-7944
DOI	10.1016/j.engfracmech.2019.02.024
英文摘要	Laboratory determination of the mode II fracture toughness K-IIC for rocks and rock-type materials remains a challenge task. One of the testing approaches is the compression of disk-type specimens, which is simple and convenient. However, although the notch in disk-type specimen is under mode II loading, the detailed studies reveal the drawbacks about interpretations of the disk-type specimens: (i) mode II fracture is only assumed without careful identifications about the actual fracture mode; or (ii) critical value of associated mode II loading is considered to be the fracture toughness K-IIC regardless of the actual fracture mode. The widely accepted failure criterion for disk-type specimens is maximum tangential stress that actually is maximum tensile stress, such that the initiated fracture generally involves the opening displacements. Thus, it raises a serious doubt about the mode II fracture from the disk-type specimens for rock-type materials. In this study, a series of the disk-type specimens of the marble was tested, and digital image correlation (DIC) was used to obtain the displacements surrounding the notch where the fracture mode was identified. Experimental results show the initiated fractures from the specimens are the mode I fractures, suggesting that the assumption of the mode II fracture is not correct. In the discussion, the interpretation is provided for: (i) differences between the critical values of mode II loading from disk-type specimens without compression and from punch-through shear specimens under compression; (ii) application of the criterion of local symmetry; and (iii) characteristics for rocks or rock-type materials and other information.
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:000501822600023
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14998]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 3.China Univ Petr, Coll Petr Engn, Dept Engn Mech, Beijing 102249, Peoples R China; 4.China Univ Petr, Coll Petr Engn, Dept Oil & Gas Well Engn, Beijing 102249, Peoples R China
推荐引用方式 GB/T 7714	Lin, Qing,Ji, Wei-Wei,Pan, Peng-Zhi,et al. Comments on the mode II fracture from disk-type specimens for rock-type materials[J]. ENGINEERING FRACTURE MECHANICS,2019,211(-):303-320.
APA	Lin, Qing,Ji, Wei-Wei,Pan, Peng-Zhi,Wang, Siqi,&Lu, Yunhu.(2019).Comments on the mode II fracture from disk-type specimens for rock-type materials.ENGINEERING FRACTURE MECHANICS,211(-),303-320.
MLA	Lin, Qing,et al."Comments on the mode II fracture from disk-type specimens for rock-type materials".ENGINEERING FRACTURE MECHANICS 211.-(2019):303-320.