Strain Field Evolution Law of Prefabricated Double-Holes Marble Based on 3D-DIC
In order to study the effect of prefabricated holes on the mechanical properties of marble,two sets of marble samples with different holes were prefabricated for comparative testing.The first group was S-shaped,with the diameter of the two holes D1 and D2 the same,and the diameter of the holes was changed.The second group was D-shaped,changing the diameter of the single hole D1,while keeping the diameter of hole D2 unchanged.By combining uniaxial compression tests with 3D-DIC technology,the maximum principal strain cloud maps of marble samples at different compression test stages were obtained,and the crack initiation and propagation laws during the failure process of marble with different holes were analyzed.The test results show that as the hole diameter increases,the peak stress and elastic modulus of the S-shaped sample decrease,while the peak stress and elastic modulus of the D-shaped sample first increase and then decrease.The cracks generated by the S-shaped sample are mainly tensile cracks,strain concentration and cracks mainly occur near the D1 hole,while the cracks generated by the D-shaped sample are mainly tensile-shear cracks,and strain concentration and cracks mainly occur near the D2 hole.The failure mode of the S-shaped sample is tensile failure,while the failure mode of the D-shaped sample changes from shear failure to tensile failure as the diameter of the D1 hole increases.
3D-DICPrefabricated double-holesUniaxial compressionCrack evolutionStrain field
万方数据
维普
