首页|Uncovering the creep deformation mechanism of rock-forming minerals using nanoindentation

Uncovering the creep deformation mechanism of rock-forming minerals using nanoindentation

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The creep phenomenon of rocks is quite complex and the creep mechanisms are far from being well understood.Although laboratory creep tests have been carried out to determine the creep deformation of various rocks,these tests are expensive and time-consuming.Nanoindentation creep tests,as an alter-native method,can be performed to investigate the mechanical and viscoelastic properties of granite samples.In this study,the reduced Young's modulus,hardness,fracture toughness,creep strain rate,stress exponent,activation volume and maximum creep displacement of common rock-forming minerals of granite were calculated from nanoindentation results.It was found that the hardness decreases with the increase of holding time and the initial decrease in hardness was swift,and then it decreased slowly.The stress exponent values obtained were in the range from 4.5 to 22.9,which indicates that dislocation climb is the creep deformation mechanism.In addition,fracture toughness of granite's rock-forming min-erals was calculated using energy-based method and homogenization method was adopted to upscale the micro-scale mechanical properties to macro-scale mechanical properties.Last but not least,both three-element Voigt model and Burgers model fit the nanoindentation creep curves well.This study is beneficial to the understanding of the long-term mechanical properties of rock samples from a micro-scale perspective,which is of great significance to the understanding of localized deformation processes of rocks.

NanoindentationGraniteTime-dependent creepStress exponentStrain rate sensitivityFracture toughness

Zhaoyang Ma、Chengpeng Zhang、Ranjith Pathegama Gamage、Guanglei Zhang

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Deep Earth Energy Laboratory,Building 60,Monash University,Melbourne,Victoria 3800,Australia

State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China

Department of Earth Science and Engineering,Imperial College London,London SW7 2BP,UK

financial sup-port provided by the China Scholarship Councilgranite core samples.In addition,funded by various projects,namely,China Postdoctoral Science FoundationChongqing Science and Technology Bureau FoundationChongqing Human Resources and Social Security Bureau Founda-tionChongqing Science and Technology Bureau FoundationNational Natural Science Foundation of China

2017064200552020M673142cstc2020jcyj-bsh0059cx2019100cstc2020jcyj-zdxm0122U19B2009

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(2)
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