PSI - Issue 15

Available online at www.sciencedirect.com

Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 00–000 Procedia Structural Integrity 15 (2019) 60–66

www.elsevier.com / locate / procedia

www.elsevier.com / locate / procedia

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.2019.07.012 ∗ Corresponding author. Tel.: + 7-495-433-6257 ; fax: + 7-499-739-9531. E-mail address: perelm@ipmnet.ru 2210-7843 c 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. Arterial stents are continuously loaded and it can be reason of small cracks formation over time, which might induce breaks and loss of implants functionality. Particularly, fractures of metal stents may result in di ff erent complications as thrombosis, perforation, and restenosis, see Chhatriwalla et al. (2009). Materials with self-healing properties can be used to avoid premature stents destruction and to guarantee theirs stable long-term mechanical reliability. During the last decades a wide range of self-healing materials (metals, polymers, ceramics) and di ff erent ap proaches for cracks self-healing have been developed by White et al. (2001); Trask et al. (2007); Blaiszik et al. (2008); Lanzara et al. (2009); Bekas et al. (2016); Tavangarian et al. (2018). Cracks self-healing in polymeric materials can occur under special external influences, activating chemical or physical processes in the material. Another approach is based on the development of special composite materials containing special components (inclusions) with ”healing ∗ Corresponding author. Tel.: + 7-495-433-6257 ; fax: + 7-499-739-9531. E-mail address: perelm@ipmnet.ru 2210-7843 c 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 In this paper the bridged crack model is used for the e ffi ciency evaluation of cracks healing in materials for stents manufacturing. During of materials self-healing the following stages should be considered: 1) formation and growth flaws / cracks under external loading; 2) activation of self-healing mechanisms; 3) healing of flaws / cracks with partial or total restoration of bonds between crack surfaces. The modelling target consists of the computational analysis of the bridging stresses distribution and in the computing of the stress intensity factors which are the main characteristics of a crack self-healing e ffi ciency. The mathematical background of the stresses problem solution is based on the singular integral-di ff erential equations.The kinetic model is used to evaluate the regeneration time of the crack bridged zone. The model can be used for the evaluation of composite materials self-healing and durability. Some results of self-healing processes analysis are presented and discussed. c 2019 The Authors. Published by Elsevier B.V. This is an open access article under th CC BY-NC-ND license (https: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Selectio and peer-review er r sponsibility of International Conferen e on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. Keywords: stent materials; cracks formation and self-healing; bridged crack model International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Modelling of materials self-healing for artery stents application ikhail Perelmuter ∗ Ishlinsky Institute for Problems in Mechanics RAS, Vernadsky avenue 101-1, Moscow, 119526, Russia Abstract In this paper the bridged crack model is used for the e ffi ciency evaluation of cracks healing in materials for stents manufacturing. During of materials self-healing the following stages should be considered: 1) formation and growth flaws / cracks under external loading; 2) activation of self-healing mechanisms; 3) healing of flaws / cracks with partial or total restoration of bonds between crack surfaces. The modelling target consists of the computational analysis of the bridging stresses distribution and in the computing of the stress intensity factors which are the main characteristics of a crack self-healing e ffi ciency. The mathematical background of the stresses problem solution is based on the singular integral-di ff erential equations.The kinetic model is used to evaluate the regeneration time of the crack bridged zone. The model can be used for the evaluation of composite materials self-healing and durability. Some results of self-healing processes analysis are presented and discussed. c 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. Keywords: stent materials; cracks formation and self-healing; bridged crack model International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Modelling of materials self-healing for artery stents application Mikhail Perelmuter ∗ Ishlinsky Institute for Problems in Mechanics RAS, Vernadsky avenue 101-1, Moscow, 119526, Russia 1. Introduction 1. Introduction Arterial stents are continuously loaded and it can be reason of small cracks formation over time, which might induce breaks and loss of implants functionality. Particularly, fractures of metal stents may result in di ff erent complications as thrombosis, perforation, and restenosis, see Chhatriwalla et al. (2009). Materials with self-healing properties can be used to avoid premature stents destruction and to guarantee theirs stable long-term mechanical reliability. During the last decades a wide range of self-healing materials (metals, polymers, ceramics) and di ff erent ap proaches for cracks self-healing have been developed by White et al. (2001); Trask et al. (2007); Blaiszik et al. (2008); Lanzara et al. (2009); Bekas et al. (2016); Tavangarian et al. (2018). Cracks self-healing in polymeric materials can occur under special external influences, activating chemical or physical processes in the material. Another approach is based on the development of special composite materials containing special components (inclusions) with ”healing