Investigating Hydrofracture Evolution of Quasi-Brittle Material Using a Post-Peak Control Technique Associated with Speckle-Shearing Interferometry

Proceedings

Lin, Shyh-Tsong¹  Chen, Li-Hsien²  Chen, Wei-Chih³  Chen, Yao-Chung⁴ 

[1] Author to whom correspondence should be addressed.;Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;Presented at the 18th International Conference on Experimental Mechanics (ICEM18), Brussels, Belgium, 1–5 July 2018.

关键词: hydraulic fracture;    post-peak behavior;    speckle-shearing interferometry;    fringe pattern;    out of plane displacement;   

DOI  :  10.3390/ICEM18-05326

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

This paper presents the experimental results obtained with a post-peak loading device of hydraulic fracture controlled by setting circumferential deformation of a specimen to be a closed-loop feedback signal during servo-water-driven and monitored with the optical technique of speckle-shearing interferometry (SSI). The macro-scale complete loading curve obtained by the post-peak loading system indicate the stiffness, peak strength and post-peak behavior of quasi-brittle material subjected to borehole water pressure. The micro-scale out-of-plane displacement (OPD) obtained by SSI corresponding to complete loading curve was exhibited where the internal crack tip was located. The complete hydrofracture evolution from displacement continuity to displacement discontinuity was investigated. The test results provide a better understanding of the hydraulic fracture mechanism which is helpful for the development of theoretical and numerical solutions related to hydraulic fractures.

【 授权许可】

CC BY