PSI - Issue 25

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 25 (2020) 477–485

© 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 the VCSI1 organizers Self-expanding intravascular stents made of nickel-titanium shape memory alloy (nitinol) serve to recover the lumen of vessels suffered from atherosclerotic stenosis. A novel drug-eluting stents are usually wrapping by a porous coating containing an antiproliferative drug around the stent struts. From the practical point of view, it is very important to understand the strength of the coating owing to the flexibility of the nitinol struts. In this paper, we study numerically the strength properties of a nitinol bar covered by a silicon coating, as a part of such a stent, under three-point flexural test using the method of movable cellular automata. The results show stages of the coating fracture as well as a periodic pattern of the cracks in the coating, which are confirmed by experimental evidence. The difference in computational and experimental results shows the way for future works on improving the model assumptions. © 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 the VCSI1 organizers Peer-review under responsibilit 1st Virtual Conference on Structural Integrity - VCSI1 Simulation of three-point bending test of the silicon-coated nitinol bar A.Yu. Smolin*, O.A. Kashin, K.V. Krukovskii Institute of Strength Physics and Materials Science SB RAS, pr. Akademicheskiy 2/4, 634055, Tomsk, Russia Abstract

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1. Introduction

Currently, the implantation of intravascular stents to restore the lumen of blood vessels when they narrow due to the formation of cholesterol plaques is one of the widely used methods (Tomberli et al., 2018). However, when installing stents in the human body, in some cases, complications arise, leading to repeated narrowing of the vessels (recoil and restenosis). One of the methods for solving this problem is the use of coatings containing drugs on stents

* Corresponding author. Tel.: +7-382-228-6975; fax: +7-382-249-2576. E-mail address: asmolin@ispms.ru

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 the VCSI1 organizers

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 the VCSI1 organizers 10.1016/j.prostr.2020.04.054