$Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading$

Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading

Coating systems provide substrate protection from mechanical and thermal failure. Coating is subjected to contact loading of normal and tangential loading, originated from contact pressure and sliding contact. In this thesis, aeroengine brittle material has been modelled to simulate coating failure...

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Main Author:	Mohsin, Mohamad Lokman
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	TA329-348 Engineering mathematics Engineering analysis
Online Access:	http://eprints.uthm.edu.my/198/1/24p%20MOHAMAD%20LOKMAN%20BIN%20MOHSIN.pdf http://eprints.uthm.edu.my/198/2/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/198/3/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20WATERMARK.pdf
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spelling	my-uthm-ep.1982021-06-22T01:42:25Z Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading 2018-08 Mohsin, Mohamad Lokman TA329-348 Engineering mathematics. Engineering analysis Coating systems provide substrate protection from mechanical and thermal failure. Coating is subjected to contact loading of normal and tangential loading, originated from contact pressure and sliding contact. In this thesis, aeroengine brittle material has been modelled to simulate coating failure under combined fracture and delamination failure. Hard brittle coatings modelled are subjected to normal and tangential loads through a finite element (FE) based methodology. A FE model was built by using the ABAQUS FE analysis software. Half cylinder-on flat contact in a two-dimensional model were carried out with mechanical properties of thermal barrier coating and steel/titanium substrate. In this research, changes of three parameters which are coating to substrate elastic mismatch, coating’s thickness and coefficient of friction (COF), were studied to analyse the effect on stress distributions, fracture behaviour and combined fracture and delamination failure. Stress intensity factor (SIF) technique is used to predict unstable crack propagation and cohesive element method (CZM) was developed to predict delamination in the cohesive element layer between coating and substrate. The results show that coating through thickness fracture is dominated by mode I fracture due to tangential stress, S11 experience by the coating. Coating delamination are dominated by mode II fracture associated by shear stress, S12 in the coating interface. Buckling behaviour dominated failure under combined fracture and delamination condition. In general, increasing COF will worsen fracture and delamination failure due to increase of overall stresses. Stiffer coating, will prevent delamination by buckling but will promote coating fracture by increasing tangential stress. It is predicted that, increasing coating thickness will prevent both fracture and delamination due to reduction of stresses and difficulty for buckling. 2018-08 Thesis http://eprints.uthm.edu.my/198/ http://eprints.uthm.edu.my/198/1/24p%20MOHAMAD%20LOKMAN%20BIN%20MOHSIN.pdf text en public http://eprints.uthm.edu.my/198/2/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/198/3/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Mechanical and Manufacturing Engineering
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TA329-348 Engineering mathematics Engineering analysis
spellingShingle	TA329-348 Engineering mathematics Engineering analysis Mohsin, Mohamad Lokman Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
description	Coating systems provide substrate protection from mechanical and thermal failure. Coating is subjected to contact loading of normal and tangential loading, originated from contact pressure and sliding contact. In this thesis, aeroengine brittle material has been modelled to simulate coating failure under combined fracture and delamination failure. Hard brittle coatings modelled are subjected to normal and tangential loads through a finite element (FE) based methodology. A FE model was built by using the ABAQUS FE analysis software. Half cylinder-on flat contact in a two-dimensional model were carried out with mechanical properties of thermal barrier coating and steel/titanium substrate. In this research, changes of three parameters which are coating to substrate elastic mismatch, coating’s thickness and coefficient of friction (COF), were studied to analyse the effect on stress distributions, fracture behaviour and combined fracture and delamination failure. Stress intensity factor (SIF) technique is used to predict unstable crack propagation and cohesive element method (CZM) was developed to predict delamination in the cohesive element layer between coating and substrate. The results show that coating through thickness fracture is dominated by mode I fracture due to tangential stress, S11 experience by the coating. Coating delamination are dominated by mode II fracture associated by shear stress, S12 in the coating interface. Buckling behaviour dominated failure under combined fracture and delamination condition. In general, increasing COF will worsen fracture and delamination failure due to increase of overall stresses. Stiffer coating, will prevent delamination by buckling but will promote coating fracture by increasing tangential stress. It is predicted that, increasing coating thickness will prevent both fracture and delamination due to reduction of stresses and difficulty for buckling.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Mohsin, Mohamad Lokman
author_facet	Mohsin, Mohamad Lokman
author_sort	Mohsin, Mohamad Lokman
title	Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
title_short	Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
title_full	Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
title_fullStr	Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
title_full_unstemmed	Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
title_sort	finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Mechanical and Manufacturing Engineering
publishDate	2018
url	http://eprints.uthm.edu.my/198/1/24p%20MOHAMAD%20LOKMAN%20BIN%20MOHSIN.pdf http://eprints.uthm.edu.my/198/2/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/198/3/MOHAMAD%20LOKMAN%20BIN%20MOHSIN%20WATERMARK.pdf
_version_	1747830551812767744

Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading

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