Fracturing, acoustic emission, and numerical simulation of granite under mode II loading

O. Stephansson, S. Stanchits, T. Backers, G. Dresen, B. Shen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Mode II loading of drill core samples of medium-grained granite is conducted using the Punch-Through Shear (PTS-) test. Cylindrical samples with circular notches at both end surfaces are subjected to independent confining pressure and shear loading of the intact portion between the notches. This paper presents results from PTS-testing at confining pressure of 30 MPa, including the pressure dependency of Mode II fracture toughness, KIIC, the resulting fracture pattern, acoustic emission (AE) characteristics and computer simulation. At failure a shear fracture connects the upper and lower notch. Fracture evolution on the macroscopic scale is described. Analysis of AE and micro-structural observations show contribution of both tensile and shear cracks to fracture propagation. AE polarity analysis shows a shift from dominantly tensile cracking to shear cracking during increasing punch loading. This suggests that fracturing in the PTS-test involves mixed-mode fracturing. The fracture initiation and propagation is analysed using the displacement discontinuity code FRACOD2D. The code simulates the fracture initiation and propagation and acoustic emission of the PTS-test with a fair agreement with the experimental results.

Original languageEnglish
Title of host publication11th International Conference on Fracture 2005, ICF11
Pages4700-4705
Number of pages6
Publication statusPublished - 2005
Externally publishedYes
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: 20 Mar 200525 Mar 2005

Publication series

Name11th International Conference on Fracture 2005, ICF11
Volume6

Conference

Conference11th International Conference on Fracture 2005, ICF11
Country/TerritoryItaly
CityTurin
Period20/03/0525/03/05

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