PSI - Issue 15

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

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 15 (2019) 51–54

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. Abstract Small dimensions of structural elements of stents make the u e of traditional testing techniques for their mechanical characterisation cumber ome. Na oindentation is an alterna ive approach which vercomes this limitati . In this paper, mechanical properties of a polymeric tube (from which the stent was laser-cut) were characterised by using the nanoindentation technique. Specifically, spherical indentation was carried out to assess the property of the tube, in comparison with the results obtained from pyramidal indentation. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Characterisation of Mechanical Properties of Polymeric Stent using Nanoindentation Raasti Naseem a , Liguo Zhao a, 0F *, Vadim V. Silberschmidt a , Yang Liu a , Xiang Zhang b a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b Lucideon Ltd, Stoke-on-Trent, ST4 7LQ, UK Abstract Small dimensions of structural elements of stents make the use of traditional testing techniques for their mechanical characterisation cumbersome. Nanoindentation is an alternative approach which overcomes this limitation. In this paper, mechanical properties of a polymeric tube (from which the stent was laser-cut) were characterised by using the nanoindentation technique. Specifically, spherical indentation was carried out to assess the property of the tube, in comparison with the results obtained from pyramidal indentation. International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Characterisation of Mechanical Properties of Polymeric Stent using Nanoindentation Raasti Naseem a , Liguo Zhao a, 0F *, Vadim V. Silberschmidt a , Yang Liu a , Xiang Zhang b a Wolfson School of Mechanical, Electrical and Man facturing Engin ering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b Lucideon Ltd, Stoke-on-Trent, ST4 7LQ, UK Keywords: Polymeric stent; Mechanical properties; Pyramidal indentation; Spherical indentation; Indentation size effect 1. Introduction Indentation can be carried out using different tip geometries which can yield varying material responses, particularly, in polymers. Pyramidal indentation is associated with a sharp tip penetrating the sample surface. There are multiple advantages to using Berkovich tip, including easy penetration and also defined plastic deformation into Keywords: Polymeric stent; Mechanical properties; Pyramidal indentation; Spherical indentation; Indentation size effect 1. Introduction Indentation ca b carried out using different tip g ometries which can yield varying material responses, particularly, in polymers. Pyramidal indentation is associated with a sharp tip penetrating the sample surface. There are multiple advantages to using Berkovich tip, including easy penetration and also defined plastic deformation into

* Corresponding author. Tel.: 0044-1509-227799. E-mail address: L.Zhao@Lboro.ac.uk * Corresponding author. Tel.: 0044-1509-227799. E mail address: L.Zhao@Lboro.ac.uk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. 2452-3216 © 2019 The Authors. Published b Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019.

2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. 10.1016/j.prostr.2019.07.010