A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential

doi:10.1016/j.engfracmech.2021.108126

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential
	Lin QD(林钦栋)3; Li SH(李世海)1,2; Gan, Yundan 3; Feng C(冯春)2
刊名	ENGINEERING FRACTURE MECHANICS
	2022
卷号	259 页码:21
关键词	Strain-rate effect Cohesive fracture model Lennard-Jones potential CDEM
ISSN号	0013-7944
DOI	10.1016/j.engfracmech.2021.108126
通讯作者	Feng, Chun(fengchun@imech.ac.cn)
英文摘要	To characterize the dynamic mechanical response of rocks during the initiation and propagation of cracks at a high strain rate, a strain-rate cohesive fracture model is established based on the Lennard-Jones potential and multi-scale model of rocks. The newly proposed model explains the micro-mechanism of strain rate effect from the molecular scale and establishes the potential energy function and force function. First, it is proposed that the strain rate effect arises due to the change of microscopic properties of molecules at a high strain rate. Thereafter, the potential energy function and force function of the strain-rate cohesive fracture model corresponding to the dynamic tensile and shear processes are established. Finally, the accuracy of the strain-rate cohesive fracture model is verified through numerical simulations. The results indicate that the strain-rate cohesive fracture model can accurately simulate the dynamic tensile failure and shear failure of rocks at different strain rates. The dynamic tensile strength, dynamic compressive strength, and dynamic tensile fracture energy obtained by numerical simulations and laboratory tests are similar.
分类号	二类/Q1
资助项目	National Key Research and Development Project of China ; Ministry of Science and Technology of China[2018YFC1505504]
WOS关键词	DISCONTINUITY EMBEDDED APPROACH ; DYNAMIC FRACTURE ; ELEMENT ; PROPAGATION ; SIMULATION ; SANDSTONE ; EVOLUTION ; MARBLE ; ZONE ; CDEM
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:000729026400001
资助机构	National Key Research and Development Project of China ; Ministry of Science and Technology of China
其他责任者	Feng, Chun
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87975]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 3.Xian Modern Chem Res Inst, Xian 710065, Shaanxi, Peoples R China;
推荐引用方式 GB/T 7714	Lin QD,Li SH,Gan, Yundan,et al. A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential[J]. ENGINEERING FRACTURE MECHANICS,2022,259:21.
APA	林钦栋,李世海,Gan, Yundan,&冯春.(2022).A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential.ENGINEERING FRACTURE MECHANICS,259,21.
MLA	林钦栋,et al."A strain-rate cohesive fracture model of rocks based on Lennard-Jones potential".ENGINEERING FRACTURE MECHANICS 259(2022):21.