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A numerical investigation of interfacial and channelling crack growth rates under low-cycle fatigue in bi-layer materials relevant to cultural heritage

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Title: A numerical investigation of interfacial and channelling crack growth rates under low-cycle fatigue in bi-layer materials relevant to cultural heritage
Authors: Charalambides, M
Zhang, R
Taylor, A
Balint, D
Wood, J
Young, C
Item Type: Journal Article
Abstract: In traditional and modern paintings on canvas or wood, two crack types have been identified, these are: (i) delamination between two of the many layers and (ii) channelling through the paint layer, terminating at the paint-substrate interface. One cause of this damage can be attributed to environment-induced low-cycle fatigue, specifically through relative humidity and temperature fluctuations. We present novel 2D as well as 3D finite element models that, for the first time, identify the time for each type of crack to initiate under a variety of realistic relative humidity (RH) cycles, as well as the corresponding crack growth rates. The focus is on modern paintings that have some layers executed in alkyd paint, found to be a vulnerable layer in a relatively short period of time. The paintings are idealised as a two-layer construction with a visco-hyperelastic alkyd paint layer on a linear elastic (acrylic) primed canvas substrate. Cracks, both interfacial and channelling, are represented using cohesive elements. To simulate the damage caused by a relative humidity cycle, a fatigue damage parameter was incorporated in the traction-separation law using a user-defined field. It was found that channelling cracks initiate slightly earlier than interfacial cracks for all the environmental conditions studied. Specifically, for an RH cycle of 35%–90%, channelling cracks initiate at 2.2 years and grow at an accelerating rate, while the interfacial crack initiates at 2.6 years and grows at a stable rate of approximately 0.1 mm/year. Narrower RH cycles lead to longer crack initiation times, e.g. the channelling crack initiates at 13.9 years under 40%–65% RH, and when the RH cycle was further narrowed to 45%–55%, the initiation time increased to 86 years. Our models are applicable to other painted or coated cultural heritage objects and can be used to inform preservation and environmental control strategies.
Issue Date: May-2021
Date of Acceptance: 3-Mar-2021
URI: http://hdl.handle.net/10044/1/88465
DOI: 10.1016/j.culher.2021.03.001
ISSN: 1296-2074
Publisher: Elsevier
Start Page: 70
End Page: 78
Journal / Book Title: Journal of Cultural Heritage
Volume: 49
Copyright Statement: © 2021 Elsevier Masson SAS. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/V502354/1
Keywords: Archaeology
2101 Archaeology
2102 Curatorial and Related Studies
2103 Historical Studies
Publication Status: Published
Embargo Date: 2022-03-13
Online Publication Date: 2021-03-14
Appears in Collections:Mechanical Engineering
Faculty of Natural Sciences
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons