PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 187–191 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. ECF22 - Loading and Environmental Effects on Structural Integrity Computational Evaluation of Artery Damage in Stent Deployment Ran He a , Liguo Zhao a, 0 F * , Vadim V. Silberschmidt a , Yang Liu a , Felix Vogt b a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany Abstract This paper aims to evaluate damage in an arterial wall and plaque caused by percutaneous coronary intervention using a finite-element (FE) method. Hyperelastic damage models, verified against experimental results, were used to describe stress-stretch responses of arterial layers and plaque in the lumen; thes models are capable to simulate soft ning behav our of the tissue due to damage. Abaqus CAE was employed to create the FE models for an artery wall with two constituent layers (media and adventitia), a symmetric uniform plaque, a bioresorbable polymeric stent and a tri-folded expansion balloon. The effect of percutaneous coronary intervention on vessel damage was investigated by simulating the processes of vessel pre-dilation, stent deployment and post-stenting dilation. Energy dissipation density was used to assess the extent of damage in the tissue. Overall, the plaque experienced the most severe damage due to its direct contact with the stent, followed by the media and adventitia layers. Softening of the plaque and the artery due to the pre dilation-induced damage can facilitate the subsequent stent-deployment process. The plaque and artery experienced heterogeneous damage behaviour after the stent deployment, caused by non-uniform deformation. The post-stenting dilation was effective to achieve a full xpansion of t e stent but caus d addition l damage to the artery. Th computational evaluation of arter damage can be also pot nti lly used to assess the ri k of in-stent restenosis after percutaneous coronary intervention. © 2018 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: Artery damage; Hyperelastic damage model; Finite element; Pre/post-dilation; Stent deploy ent 1. Introduction Percutaneous Coronary Intervention (PCI) is a prevalent treatment for atherosclerosis to restore the normal blood flow in the coronary artery. D ring this stenting procedure, a balloon is positioned in the diseased part of the vessel and used to inflate a stent to open the blocked blood vessel. In some cases, such as patients with severe stenosis, pre-dilation needs © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Computational Evaluation of Artery Damage in Stent Deployment Ran He a , Liguo Zhao a, 0 F * , Vadim V. Silberschmidt a , Yang Liu a , Felix Vogt b a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany Abstract This paper aims to evaluate damage in an arterial wall and plaque caused by percutaneous coronary intervention using a finite-element (FE) method. Hyp relasti d models, verif ed gainst experim ntal re ults, w re used to describ stress-stretch responses of arterial layers and plaque in the lumen; these models are capable t simul te softening behaviour of the tissue due to damage. Abaqus CAE was employed to create the FE models for an artery wall with two constituent layers (media and adventitia), a symmetric uniform plaque, a bioresorbable polymeric stent and a tri-folded expansion balloon. The effect of percutaneous coronary intervention on vessel damage was investigated by simulating the processes of vessel pre-dilation, stent de loyme t and post-stenting dilation. Energy issipation density was used to assess the extent of damage in the tissue. Overall, the plaque experie ced the most severe damage due to its direct contact ith the stent, followed by the media and adventitia lay rs. Softening of the plaqu and the artery due to the pre dilation-induced damage can facilitate the subsequent stent-deployment process. The plaque and artery experienced heter geneous amage behaviour after the stent deploym nt, caused by non-unif r deformation. The ost-stenting dilation was effective t achieve a full expansion f th stent but caused additio al damage to the artery. The omputational evaluation of artery damage can be also potentially used t assess the risk of in-stent resteno is aft r percu an ous coronary intervention. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Artery damage; Hyperelastic damage model; Finite element; Pre/post-dilation; Stent deployment 1. Introduction Percutaneous Coronary Intervention (PCI) is a prevalent treatment for atherosclerosis to restore the normal blood flow in the coronary artery. During this stenting procedure, a balloon is positioned in the diseased part of the vessel and used to inflate a stent to open the blocked blood vessel. In som cases, such as patients with severe stenosis, pre-dilation needs © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

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

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.031