Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant

Osteoarthritis due to rapid aging population in Malaysia and developed countries leads to an extensive application of titanium artificial hip implants. However, titanium alloys (Ti-6Al-4V) cannot directly adhere with human bone due to bio-compatibility issue. Thus, Hydroxyapatite (HAp:Ca10(PO4)(OH)2...

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Main Author:	Muniandy, Nagentrau
Format:	Thesis
Language:	English English English
Published:	2021
Subjects:	R856-857 Biomedical engineering Electronics Instrumentation TJ1040-1119 Machinery exclusive of prime movers
Online Access:	http://eprints.uthm.edu.my/1826/2/NAGENTRAU%20MUNIANDY%20-%20declaration.pdf http://eprints.uthm.edu.my/1826/1/NAGENTRAU%20MUNIANDY%20-%2024p.pdf http://eprints.uthm.edu.my/1826/3/NAGENTRAU%20MUNIANDY%20-%20full%20text.pdf
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spelling	my-uthm-ep.18262021-10-12T03:33:21Z Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant 2021-03 Muniandy, Nagentrau R856-857 Biomedical engineering. Electronics. Instrumentation TJ1040-1119 Machinery exclusive of prime movers Osteoarthritis due to rapid aging population in Malaysia and developed countries leads to an extensive application of titanium artificial hip implants. However, titanium alloys (Ti-6Al-4V) cannot directly adhere with human bone due to bio-compatibility issue. Thus, Hydroxyapatite (HAp:Ca10(PO4)(OH)2) coating which consists of main composition of human bone is plasma sprayed on titanium implants to maintain fixations during bone in-growth process. HAp coatings are susceptible to fail due to brittle fractures (coating through thickness crack) to initiate delamination which promotes fretting wear behaviour. Fretting wear particles are concerned for activating inflammations at surrounding organs, which lead to loosening of implants or subsequent failures. Present research aims to develop a finite element model to examine delamination-fretting wear behaviours that can suitably mimic actual loading conditions at HAp-Ti-6Al-4V interface of hip implant femoral stem component to formulate maximum wear depth predictive equation as a novel and fast failure prediction tool. Three simple finite element contact configuration models subjected to different mechanical and tribological properties consist of contact pad (bone), HAp coating and Ti-6Al-4V substrate are developed using contact modelling, cohesive zone modelling (CZM) and adaptive wear modelling (UMESHMOTION) approaches to be examined under static simulation. The developed finite element models are validated and verified with modified Hertzian theoretical solution and reported literatures. The findings revealed that significant delamination-fretting wear is recorded at contact edge (leading edge) as a result of substantial contact pressure and contact slip driven by stress singularity effect. Tensile-compressive condition (R = -1 ) experiences most significant delamination-fretting wear behaviour (8 times higher) compared to stress ratio R = 0.1 and R = 10. Finally, maximum delamination-fretting wear depth predictive equations are successfully formulated with significant goodness of fit and reliability as a fast failure prediction tool. 2021-03 Thesis http://eprints.uthm.edu.my/1826/ http://eprints.uthm.edu.my/1826/2/NAGENTRAU%20MUNIANDY%20-%20declaration.pdf text en staffonly http://eprints.uthm.edu.my/1826/1/NAGENTRAU%20MUNIANDY%20-%2024p.pdf text en public http://eprints.uthm.edu.my/1826/3/NAGENTRAU%20MUNIANDY%20-%20full%20text.pdf text en validuser mphil doctoral Universiti Tun Hussein Onn Malaysia Faculty of Engineering Technology
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	R856-857 Biomedical engineering Electronics Instrumentation TJ1040-1119 Machinery exclusive of prime movers
spellingShingle	R856-857 Biomedical engineering Electronics Instrumentation TJ1040-1119 Machinery exclusive of prime movers Muniandy, Nagentrau Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
description	Osteoarthritis due to rapid aging population in Malaysia and developed countries leads to an extensive application of titanium artificial hip implants. However, titanium alloys (Ti-6Al-4V) cannot directly adhere with human bone due to bio-compatibility issue. Thus, Hydroxyapatite (HAp:Ca10(PO4)(OH)2) coating which consists of main composition of human bone is plasma sprayed on titanium implants to maintain fixations during bone in-growth process. HAp coatings are susceptible to fail due to brittle fractures (coating through thickness crack) to initiate delamination which promotes fretting wear behaviour. Fretting wear particles are concerned for activating inflammations at surrounding organs, which lead to loosening of implants or subsequent failures. Present research aims to develop a finite element model to examine delamination-fretting wear behaviours that can suitably mimic actual loading conditions at HAp-Ti-6Al-4V interface of hip implant femoral stem component to formulate maximum wear depth predictive equation as a novel and fast failure prediction tool. Three simple finite element contact configuration models subjected to different mechanical and tribological properties consist of contact pad (bone), HAp coating and Ti-6Al-4V substrate are developed using contact modelling, cohesive zone modelling (CZM) and adaptive wear modelling (UMESHMOTION) approaches to be examined under static simulation. The developed finite element models are validated and verified with modified Hertzian theoretical solution and reported literatures. The findings revealed that significant delamination-fretting wear is recorded at contact edge (leading edge) as a result of substantial contact pressure and contact slip driven by stress singularity effect. Tensile-compressive condition (R = -1 ) experiences most significant delamination-fretting wear behaviour (8 times higher) compared to stress ratio R = 0.1 and R = 10. Finally, maximum delamination-fretting wear depth predictive equations are successfully formulated with significant goodness of fit and reliability as a fast failure prediction tool.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Doctorate
author	Muniandy, Nagentrau
author_facet	Muniandy, Nagentrau
author_sort	Muniandy, Nagentrau
title	Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
title_short	Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
title_full	Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
title_fullStr	Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
title_full_unstemmed	Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant
title_sort	delamination-fretting wear failure evaluation at hap-ti-6al-4v interface of artificial hip implant
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Engineering Technology
publishDate	2021
url	http://eprints.uthm.edu.my/1826/2/NAGENTRAU%20MUNIANDY%20-%20declaration.pdf http://eprints.uthm.edu.my/1826/1/NAGENTRAU%20MUNIANDY%20-%2024p.pdf http://eprints.uthm.edu.my/1826/3/NAGENTRAU%20MUNIANDY%20-%20full%20text.pdf
_version_	1747830868719697920

Delamination-fretting wear failure evaluation at HAp-Ti-6Al-4V interface of artificial hip implant

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