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Experimental investigation on the anisotropy of mode-I fracture and tensile failure of layered shale by Ma, Tianshou (author);Wang, Haonan (author);Liu, Yang (author);Fu, Chenliang (author);Ranjith, P.G. (author) is a Engineering article available to read on EtoBox.

What is Experimental investigation on the anisotropy of mode-I fracture and tensile failure of layered shale about?

Mode-I fracture toughness (K IC) and tensile strength (σ t) are significant parameters in hydraulic fracturing. Owing to the unique mineral composition and sedimentary environment of shale, the mechanical properties of shale exhibit anisotropy. In this study, the notched semi-circular bend (NSCB) and Brazilian disc (BD) tests were combined with acoustic emission (AE) and digital image correlation (DIC) technology to investigate the anisotropic fracture and tensile behaviors of layered shale. The critical plane approach (CPA) criterion is extended and validated, and the universality of the extended CPA criterion is confirmed for both K IC and σ t prediction. In addition, the variation of K IC and σ t versus loading angle, the relationship between K IC and σ t, the typical failure modes of both NSCB and BD specimens, and the fracture initiation angle of layered shales are discussed comprehensively. The following conclusions were drawn: (1) K IC and σ t increased with increasing in the loading angle (β), which indicated significant anisotropy of layered shale, and the AE responses for different loading angles also differed significantly. (2) The variation of anisotropic K IC and σ t o

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Author

Ma, Tianshou (author);Wang, Haonan (author);Liu, Yang (author);Fu, Chenliang (author);Ranjith, P.G. (author)

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)