PSI - Issue 26

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

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ScienceDirect

Procedia Structural Integrity 26 (2020) 299–305

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The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Design Aspects of Hip Implant Made of Ti-6Al-4V Extra Low Interstitials Alloy Aleksa Milovanović a , Aleksandar Sedmak b* , Aleksandar Grbović b , Tamara Mijatović a , Katarina Čolić a ić , Aleks b* b a i a

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a Innovation Centre of the Faculty of Mechanical Engineering, Serbia b University of Belgrade, Faculty of Mechanical Engineering, Serbia b i it f l , lt f i l i i , i

Abstract

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© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers The main concerns in design of hip implants are fracture and fatigue related issues. In this paper, reverse engineering is used to re design a hip implant produced by precision casting, using Ti6Al4V Extra Low Interstitials (ELI) alloy. As the most critical part, hip neck has been in the focus of this analysis, keeping in mind that the lower the thickness is, the higher the movement of joint may be, but affecting its structural integrity at the same time. Thus, 5 different models are created with different neck thickness and analyzed by using the Finite Element Method (FEM) for stress-strain calculation and extended FEM (XFEM) for fatigue crack growth. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers Keywords: Total hip replacement implant; Finite element method; Ti-6Al-4V ELI alloy; Reverse Engineering i i i l t i i ti , i i l t t titi l ll . t t iti l t, i i t t i l i , i i i t t t l t t i i , t i t t j i t , t ti it t t l i t it t t ti . , i t l t it i t t i l i t i it l t t t t i l l ti t ti t . t s. Published by Elsevier B.V. This is an open a ti l t li tt :// ti . /li / / . / i i ilit t i : t l i r l t i l t; i it l t t ; i- l- I ll ; r i ri

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1. Introduction

Loads acting on hip implants vary from approximately body weight up to 8.7 times the body weight (e.g. stumbling case, [1-3]), causing frequent premature failures. Extensive research has been performed in recent years to assess integrity of hip implants made of different materials, including stainless steel, Cobalt-Chromium and Titanium based i i l t i t l i t t . ti t i t . . t li , , i t t il . t i i t t i t it i i l t i t t i l , i l i t i l t l, lt i it i ti

* Corresponding author. E-mail address: aleksandarsedmak@gmail.com i t r. - il : l r il. rr

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers l i . . i i ti l t li tt :// ti . /li / / . / i i ilit t i - t . li

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 10.1016/j.prostr.2020.06.038