Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/8019
Title: A novel rate-dependent cohesive-zone model combining damage and visco-elasticity
Authors: Musto, M
Alfano, G
Keywords: Interface elements;Viscoelasticity;Thermodynamics;Damage-mechanics;Crack growth in rubber;Rate-dependent crack
Issue Date: 2013
Publisher: Elsevier
Citation: Computers and Structures, 118, 126 - 133, 2013
Abstract: This paper presents a novel rate-dependent cohesive-zone model combining damage and visco-elasticity and based on two fundamental assumptions. Firstly we postulate the existence of an intrinsic (i.e. rate-independent) fracture energy. Secondly, within a thermodynamically consistent damage-mechanics framework we assume that the evolution of the damage variable is related to the current free energy and to the intrinsic fracture energy. The underlying idea is that the energy of the bonds at the micro-level is rate-independent and that the rate-dependence of the overall dissipated energy during crack propagation is a natural by-product of the visco-elastic dissipation lumped on the zero-thickness interface. Quite good agreement within an expected range of loading rates was obtained between numerical and experimental results for a DCB specimen with steel arms bonded through a rubber interface. This is despite the fact that for this application the model has been kept as simple as possible using a quadratic elastic energy and linear visco-elasticity with one relaxation time only. Therefore, the presented results support the fundamental principles behind the proposed approach and indicate that the model has the potential to be refined into a highly accurate tool of analysis based on sound physical arguments.
Description: This is the author’s post-print version of a work that was accepted for publication in Computers & Structures. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.The published paper is available from the link below.
URI: http://www.sciencedirect.com/science/article/pii/S0045794912003343
http://bura.brunel.ac.uk/handle/2438/8019
DOI: http://dx.doi.org/10.1016/j.compstruc.2012.12.020
ISSN: 0045-7949
Appears in Collections:Publications
Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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