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A numerical study of crack shielding/anti-shielding in layered architectures

A numerical study of crack shielding/anti-shielding in layered architectures
A numerical study of crack shielding/anti-shielding in layered architectures
Previous research has indicated the potential effectiveness of adopting micro-scale layered architectures to improve the fatigue damage resistance of coatings. However, the optimisation of these coatings is difficult due to the existence of many different factors affecting fatigue performance in such micro-scale layered architectures. In particular, the interaction of successive shielding and anti-shielding processes on crack growth resistance is therefore addressed in this paper by numerical simulation analysis. The crack tip fields in a series of layered architectures were simulated based on varying assumed constitutive materials properties to reveal the interaction of shielding/anti-shielding characteristics in complex architectures in a simple exemplar system. The evolution of crack driving force (CDF) with crack length was calculated and linked to crack growth life to investigate the effect of the ordering of shielding/anti-shielding characteristics on the crack tip field and hence on crack growth life. Layered architectures with different numbers, ordering and placing of layers, were assessed and parametric studies of 4 layered architectures were carried out. This allows analysis of the effect of these individual factors on shielding and its interactive effect with anti-shielding in multi-layered architectures. Understanding the combined effect on crack growth performance and overall fatigue life controlled by crack propagation provides insight into the generic design of micro-scale layered architectures.
Multi-layered systems;, Shielding, Fatigue crack growth;, Crack driving force; Finite element analysis
0142-1123
503-519
Lu, Songsong
179a342f-28f8-4181-8767-f5be79806578
Laborda Cabo, Andreu
c52a5a68-9f76-4ae2-a9fa-4599b281d893
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Zhang, Yi
18b3a252-4a76-4cda-8404-4bb6e922468e
Verbickas, Rolandas
39974567-21e0-43d6-8b5c-349add1fa6ff
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Lu, Songsong
179a342f-28f8-4181-8767-f5be79806578
Laborda Cabo, Andreu
c52a5a68-9f76-4ae2-a9fa-4599b281d893
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Zhang, Yi
18b3a252-4a76-4cda-8404-4bb6e922468e
Verbickas, Rolandas
39974567-21e0-43d6-8b5c-349add1fa6ff
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17

Lu, Songsong, Laborda Cabo, Andreu, Cook, Richard, Zhang, Yi, Verbickas, Rolandas and Reed, Philippa (2019) A numerical study of crack shielding/anti-shielding in layered architectures. International Journal of Fatigue, 124, 503-519. (doi:10.1016/j.ijfatigue.2019.03.030).

Record type: Special issue

Abstract

Previous research has indicated the potential effectiveness of adopting micro-scale layered architectures to improve the fatigue damage resistance of coatings. However, the optimisation of these coatings is difficult due to the existence of many different factors affecting fatigue performance in such micro-scale layered architectures. In particular, the interaction of successive shielding and anti-shielding processes on crack growth resistance is therefore addressed in this paper by numerical simulation analysis. The crack tip fields in a series of layered architectures were simulated based on varying assumed constitutive materials properties to reveal the interaction of shielding/anti-shielding characteristics in complex architectures in a simple exemplar system. The evolution of crack driving force (CDF) with crack length was calculated and linked to crack growth life to investigate the effect of the ordering of shielding/anti-shielding characteristics on the crack tip field and hence on crack growth life. Layered architectures with different numbers, ordering and placing of layers, were assessed and parametric studies of 4 layered architectures were carried out. This allows analysis of the effect of these individual factors on shielding and its interactive effect with anti-shielding in multi-layered architectures. Understanding the combined effect on crack growth performance and overall fatigue life controlled by crack propagation provides insight into the generic design of micro-scale layered architectures.

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More information

In preparation date: 4 December 2018
Accepted/In Press date: 19 March 2019
e-pub ahead of print date: 20 March 2019
Published date: July 2019
Keywords: Multi-layered systems;, Shielding, Fatigue crack growth;, Crack driving force; Finite element analysis

Identifiers

Local EPrints ID: 429487
URI: https://eprints.soton.ac.uk/id/eprint/429487
ISSN: 0142-1123
PURE UUID: 252abdb5-c3ce-450f-8d67-e659024a4c09
ORCID for Andreu Laborda Cabo: ORCID iD orcid.org/0000-0002-0696-1916
ORCID for Philippa Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 27 Mar 2019 17:30
Last modified: 09 May 2019 00:37

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Contributors

Author: Songsong Lu
Author: Richard Cook
Author: Yi Zhang
Author: Rolandas Verbickas
Author: Philippa Reed ORCID iD

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