基于CT数字体相关法测量红砂岩单轴压缩内部三维应变场

doi:10.13722/j.cnki.jrme.2015.01.003

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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.

Key words： rock mechanics uniaxial compression internal three dimensional strain field digital volume image method industrial computer tomography(CT) deformation localization

Received: 06 January 2014

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.01.003 OR http://www.rockmech.org/EN/Y2015/V34/I01/21

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