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| MEASUREMENT OF 3D STRAIN FIELD IN RED STONE SAMPLE UNDER UNIAXIAL COMPRESSION WITH COMPUTER TOMOGRAPHY AND DIGITAL VOLUME CORRELATION METHOD |
| MAO Lingtao1，2，YUAN Zexun2，3，LIAN Xiuyun2，PENG Ruidong1，2，LIU Hongbin2 |
(1. State Key Laboratory of Coal Resources and Safety Mining，China University of Mining and Technology，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；
3. Department of City Construction，Beijing City University，Beijing 100083，China) |
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Abstract 3D digital volumetric images of red sandstone specimen during uniaxial compression were obtained in real time by using industrial computer tomography(CT) of X-ray. The digital volume correlation(DVC) method was applied to calculate the three dimensional displacement and strain fields inside of the sample. The development of strain localization and the failure process were revealed. The internal features of red sandstone were used as speckle patterns，the information carriers of deformation. The accuracy of measurement by DVC method reached 0.05 voxels. The notable strain localization inside the red sandstone specimen was observed and the zones of strain localization occurred at 68.9% of peak load and developed gradually until finally the specimen was broken. The localized strain zone is consistent with the final position of failure surface in the specimen.
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Received: 06 January 2014
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2015, Vol. 34 
