Experimental Investigation on Deformation and Failure of Rock under Cyclic Indentation
Indentation induced cracking may have widely encountered in rock engineering,such as drilling and cutting process.It is significant to investigate the deformation and failure process for further understanding the failure mechanism of rock under cyclic indentation.In the present work,we have experimentally investigated the deformation fields on the sample surface via digital image correlation (DIC) technique.It has been found that the force-indentation displacement exhibits hysteresis during the loading-unloading cycles.The energy dissipation and the displacement field in the samples during the process has been analyzed.Furthermore,a median crack has been observed to nucleate running almost parallel to the loading axis when indentation force amounts to a critical value.Experimental analysis reveals that local tensile strain dominates the crack nucleation of rock and the shear strain has an effective influence on crack propagation.In unload-reloading process,crack behavior closure and re-opening is clearly observed by DIC technique.By the displacement distribution along the crack surface,crack opening displacement (COD) and stress intensity factor can be calculated for further fracture analysis.
Rock Cyclic indentation Digital image correlation Deformation and failure
Hao Zhang Haipeng Song Yilan Kang Ganyun Huang
Tianjin Key Laboratory of Modern Engineering Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300072,Peoples Republic of China
国际会议
北京
英文
1-5
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）