Calibration of nonlocal models for tensile fracture in quasi-brittle heterogeneous materials

Xenos, D., Grégoire, D., Morel, S. and Grassl, P. (2015) Calibration of nonlocal models for tensile fracture in quasi-brittle heterogeneous materials. Journal of the Mechanics and Physics of Solids, 82, pp. 48-60. (doi:10.1016/j.jmps.2015.05.019)

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Abstract

A new calibration strategy for integral-type nonlocal damage models for quasi-brittle materials is proposed. It is based on the assumption that in the fracture process zone in quasi-brittle materials the large majority of energy is dissipated in a localised rough crack. Measuring the roughness of the fracture surface allows for calibrating the interaction radius of nonlocal models by matching experimental and numerical standard deviations of spatial distributions of dissipated energy densities. Firstly, fracture analyses with a lattice model with random fields for strength and fracture energy are used to support the assumptions of the calibration process. Then, the calibration strategy is applied to an integral-type nonlocal damage model for the case of a fracture surface of a three-point bending test.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Grassl, Dr Peter
Authors: Xenos, D., Grégoire, D., Morel, S., and Grassl, P.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of the Mechanics and Physics of Solids
Publisher:Elsevier Ltd.
ISSN:0022-5096
ISSN (Online):0022-5096
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Journal of the Mechanics and Physics of Solids 82:48-60
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
566601SAFE - a Systems Approach For Engineered BarriersPeter GrasslEngineering & Physical Sciences Research Council (EPSRC)EP/I036427/1ENG - ENGINEERING INFRASTRUCTURE & ENVIR