PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 438–443 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Reverse engineering based integrity assessment of a total hip prosthesis Milena Babić, Ozren Verić , Željko Božić *, Aleksandar Sušić University of Zagreb, Faculty of Mech. Eng. And Nav. Arch., I. Lučića 5, 10000 Zagreb, Croatia Abstract The structural strength of a total hip prosthesis was investigated based on a 3D scanning procedure of a hip prosthesis and Finite Element Analysis. 3D scanning was performed by the ATOS 3D scanner, and the CAD model was built using Geomagic Design X software. The obtained CAD model was imported to Finite Element simulation software Abaqus to generate a FEM model. By using the developed FEMmodel stress and strain distribution in the femoral component were calculated for a typical human walking load case. The analysis was performed for a newly implanted prosthesis and for a case with loosened femoral component of the same hip prosthesis. The analysis results show that in case of loosened femoral component stress concentrations occur at locations where fatigue problems in real cases were observed. © 2018 The Authors. Published by lsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Total hip prosthesis; 3D scanning; stress analysis; reverse engineering 1. In roduction The present-day lifestyle, which includes reduced physical activity and irregular diet often leads to increased body weight and weakening of muscles, which make up an important part of joint support. This causes irregularities in biomechanics of human movement, including movements of hip joint. Irregular movements can further lead to permanent hip joint injuries, which in time may cause pain and stiffness of the joint. Patients with severe hip joint injuries are subject to hip replacement surgery. This type of surgery is a routine procedure after which the quality of patients’ lives is considerably higher. ECF22 - Loading and Environmental effects on Structural Integrity Reverse engineering based integrity assessment of a total hip prosthesis Milena Babić, Ozren Verić , Željko Božić *, Aleksandar Sušić University of Zagreb, Faculty of Mech. Eng. And Nav. Arch., I. Lučića 5, 10000 Zagreb, Croatia Abstract The structural strength of a total hip prosthesis was investigated based on a 3D scanning procedure of a hip prosthesis and Finite Element Analysis. 3D scanning was performed by the ATOS 3D scanner, and the CAD model was built using Geomagic Design X software. The obtained CAD model was imported o Finit Eleme t simulation software Abaqus t gener te a FEM model. By using the developed FEMmodel stress and strain distribution in the femoral component were calculated for a typical human walking load case. The analysis was performed for a newly implanted prosthesis and for a case with loosened femoral component of the same hip prosthesis. The analysis results show that in case of loosened femoral component stress concentrations occur at locations where fatigue problems in real cases were observed. © 2018 The Authors. Published by Elsevier B.V. Peer- eview under responsibility of the ECF22 organizers. Keywords: T tal hip prosthesis; 3D scanning; stress analysis; r verse engine ring 1. Introduction The present-day lifestyle, which includes reduced physical activity and irregular diet often leads to increased body weight and weakening of muscles, which make up an mportant part of joint support. This causes irregularities in biomechanics of human movement, including movements of hip joint. Irregular movements can further lead to per anent hip joint injuries, which in time may cause pain and stiffness of the joint. Patients with severe hip joint injuries are subject to hip replacement surgery. This type of surgery is a routine procedure after which the quality of patients’ lives is considerably higher. © 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.: +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 responsibility of the ECF22 organizers. * Corresponding author. Tel.: +385-1-6168-536; fax: +385-1-6156-940. E-mail address: zeljko.bozic@fsb.hr * Corresponding author. Tel.: +385-1-6168-536; fax: +385-1-6156-940. E-mail address: zeljko.bozic@fsb.hr

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.2018.12.073