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Title of Journal: J Cent South Univ

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Abbravation: Journal of Central South University

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Central South University

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DOI

10.1002/we.84

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2227-5223

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Mechanism of fracture in macro and microscales i

Authors: M Eftekhari A Baghbanan H Hashemolhosseini H Amrollahi
Publish Date: 2015/11/08
Volume: 22, Issue: 11, Pages: 4426-4433
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Abstract

The hollow centre cracked disc HCCD specimen is one of the suggested alternative methods for determining the fracture toughness of rock This work aims to investigate the fracture mechanism in HCCD in macro and microscales using numerical methods extended finite element method XFEM and particle flow code PFC modeling respectively In the XFEM heaviside and neartip enrichment functions are employed to consider the presence of the crack in the model In PFC modeling the movement and interaction of stressed assemblies of rigid spherical particles are modeled using the distinct element method DEM A numerical code called MEXFEM based on XFEM has been developed to simulate the problems involving crack The models of pure modes I and II in macroscale are simulated in microscale The results show that dimensionless stress intensity factors Y I Y II for pure modes I and II increase by increasing the crack length ratio The angle at which the pure mode II occurs decreases by increasing the crack length ratio In mixed mode III The value of Y I decreases by increasing the crack angle while the value of Y II increases to a given crack angle and then it decreases Moreover the fracture in microscale unlike the macroscale includes a combination of different modes of fracturing

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