Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation

doi:10.1002/ese3.759

	Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation
	Song, Rui 1,3; Wang, Yao 2; Sun, Shuyu 3; Cui, Mengmeng 2; Liu, Jianjun 1
刊名	ENERGY SCIENCE & ENGINEERING
	2020-06-05
页码	12
关键词	dimensionless analysis initial strength micro-CT micro-indentation residual strength
ISSN号	2050-0505
DOI	10.1002/ese3.759
英文摘要	The micro-indentation test has been regarded as an efficient tool to obtain the elasticity modulus and hardness of the minerals in rock, which is essential for studying the deformation-crack mechanism of the pore structure. However, researches on microscopic plastic parameters have been rarely conducted. This paper develops a novel method to determine the microscopic initial strength and residual strength of brittle sandstone. A dimensionless analysis on the micro-indentation curve of rock is conducted to acquire its key influencing factors of the elastoplastic properties, which include the initial cohesive force and the residual cohesive force. Then, small cylindrical rock samples are prepared for micro-CT scanning and micro-indentation test by a conical indenter to acquire the microstructure, indentation curve, and the microscale elasticity. The pore scale indentation simulation is conducted using the reconstructed rock models with different strength. The function between the indentation curve and strength is deduced by the parametric finite element method (FEM) study. Based on this function, the microscale initial strength and residual strength of the brittle sandstone are determined. The proposed method is validated by comparing the microscale numerical simulation results of uniaxial compression on the representative volume element (RVE) model of rock with the experimental results. A reasonable deviation is observed compared with the experimental benchmark data for the stress-strain curves, as well as Young's modulus and uniaxial compression strength, proving the effectiveness of the proposed method.
资助项目	King Abdullah University of Science and Technology (KAUST)[BAS/1/1351-01] ; National Natural Science Foundation of China[51909225] ; National Natural Science Foundation of China[51874262] ; State Key Laboratory of Geomechanics and Geotechnical Engineering[Z017009] ; National Science and Technology Major Project of China[2017ZX05013001-002] ; China Scholarship Council
WOS研究方向	Energy & Fuels
语种	英语
出版者	WILEY
WOS记录号	WOS:000537859300001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24274]
专题	中科院武汉岩土力学所
通讯作者	Sun, Shuyu; Cui, Mengmeng
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 2.Southwest Petr Univ, Chengdu 610500, Peoples R China 3.King Abdullah Univ Sci & Technol KAUST, Computat Transport Phenomena Lab CTPL, Thuwal 239556900, Saudi Arabia
推荐引用方式 GB/T 7714	Song, Rui,Wang, Yao,Sun, Shuyu,et al. Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation[J]. ENERGY SCIENCE & ENGINEERING,2020:12.
APA	Song, Rui,Wang, Yao,Sun, Shuyu,Cui, Mengmeng,&Liu, Jianjun.(2020).Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation.ENERGY SCIENCE & ENGINEERING,12.
MLA	Song, Rui,et al."Evaluation of elastoplastic properties of brittle sandstone at microscale using micro-indentation test and simulation".ENERGY SCIENCE & ENGINEERING (2020):12.