Predictive and prognostic modelling and simulation of coatings subject to corrosion and mechanical failures

This research presents analytical and mathematical modelling of coating failures within industrial components, structures, mobile assets and systems due to corrosive degradation and mechanical fracture. These failures lead to several surface problems; therefore, contact mechanics and electrochemistr...

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Bibliographic Details
Published in:International journal of computational methods and experimental measurements 2018-01, Vol.6 (3), p.487-498
Main Authors: Ahmad Khan, Zulfiqar, Latif, Jawwad, Nazir, Hammad, Saeed, Adil, Stokes, Keith
Format: Article
Language:English
Subjects:
Blistering
Cathodic coating (process)
Computer simulation
Contact stresses
Corrosion
Crack propagation
Crack tips
Degradation
Electrochemistry
Failure analysis
Failure mechanisms
Interfacial cracks
Mathematical analysis
Mathematical models
Predictions
Residual stress
Species diffusion
Stress intensity factors
Substrates
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Summary:This research presents analytical and mathematical modelling of coating failures within industrial components, structures, mobile assets and systems due to corrosive degradation and mechanical fracture. These failures lead to several surface problems; therefore, contact mechanics and electrochemistry approaches incorporating induced residual stresses have been adopted to develop a comprehensive solution for the prediction and prognostic of such failures. Experimental study of film cracking and its propagation into substrates, interfacial transient behaviours and film-substrate system has been conducted. A parallel study of corrosive degradation to include cathodic delamination, cathodic blistering and tribo-corrosion of films has been conducted. Experimental and analytical studies of induced residual stresses within the coating and their effects on failure mechanisms and propagation have been completed. A detailed investigation of elastic mismatch at the interfacial contact and interfacial crack tip field has been performed and a complex stress intensity factor is presented. Mathematical derivation of oscillatory singularity, mode mix and interfacial fracture criterion to include adhesion are presented. This paper presents novel mathematical modelling incorporating interfacial crack propagating, diffusion of corrosive species and cathodic blistering for prediction and prognoses of coating failures.
ISSN:2046-0546
2046-0554
DOI:10.2495/CMEM-V6-N3-487-498