Crack tip asymptotic field and K-dominant region for anisotropic semi-circular bend specimen
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Date
2020-10
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
This study reports the coefficients of the crack tip asymptotic field for the semi-circular bend (SCB) specimen made of anisotropic rocks when subjected to pure mode loading. The finite element over-deterministic method is employed to determine the singular and higher order terms of the crack tip asymptotic field for a wide range of geometry and anisotropy parameters associated with the Mode I SCB test. These parameters are helpful when analysing the fracture path and failure mechanism of anisotropic rocks in cases where the process zone is large compared to the crack length. We also apply an energy-based criterion on the crack tip fields to evaluate the size of the K-dominant region as a function of geometry configuration and anisotropy. It is concluded that the ISRM-suggested size requirement for the SCB samples of rock can yield underestimated values of fracture toughness due to the constraints applied to the FPZ development.
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Publication status
published
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Book title
Journal / series
Volume
109
Pages / Article No.
102640
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Semi-circular bend (SCB); Anisotropy; Finite element; T-stress; Higher order parameters; K-dominant
Organisational unit
02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences