PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 8 (2018) 75–82 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Cellular structures from additive processes: design, homogenization and experimental validation Giorgio De Pasquale a, *, Marco Montemurro b , Anita Catapano c , Giulia Bertolino a , Luca Revelli a a Politecnico di Torino, Dept. of Mechanics and Aerospace, Torino 10129, Italy b Arts et Métiers ParisTech, I2M CNRS UMR 5295, Talence 33405, France c Bordeaux INP, Université de Bordeaux, I2M CNRS UMR 5295, Talence 33405, France Abstract The importance of lightweight structures in many fields of engineering is well known since long time. The innovations in technological processes based on material addiction allow pushing the design towards challenging geometries and associated structural properties. Engineered materials like lattice structures can be theoretically used to modify the local material properties and strength with minimization of the mass of components; in practice, several issues are still to be solved in stabilization of additive processes and achieving repe table structures able to pa s qualification procedures. At this purpose, dedica ed experimental and design methods l ke those reported in t is paper are needed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: lattice structures; homogenisation; additive layer manufacturing; characterization; finite element method In biomechanics, current solutions for bone, dental and orthopedic implants are based on components made of metal alloys such as titanium alloys. These materials provide excellent resistance to corrosion in a biological reactive environment, biocompatibility, fatigu resistance, a d high strength-to-weight ratios compared to other solutions. AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Cellular structures from additive processes: design, hom genizati n and experimental validation Giorgio De Pasquale a, *, Marco Montemurro b , A ita Catapano c , Giulia Bertolino a , Luca Revelli a a Politecnico d Torino, D pt. of echanics and Aerosp c , Torino 10129, Italy b Arts et Métiers ParisTech, I2M CNRS UM 5295, Talence 33405, France c Bordeaux INP, Université de Bordeaux, I2M CNRS UMR 5295, Talence 33405, France Abstract The import nce of lightweight structu es in many fields of engineering is well known since long time. The i novations in technological p ocesses bas d on material addic ion allow pu hing the design towards challenging geometries and associat d structural properties. Engineered materials like lattice structures can be theoretically sed to modify the local material properties n str ngt with mi imizati n of the mass of comp nents; in practice, several issues are still to be solved in stabilization f additive processes and achieving repeatable structures able to pass qualification procedures. At this urpose, dedicated exp rimental and design methods like those r ported in th s pap r ar needed. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of AIAS 2017 International Conference o Stress Analysis. Keywords: lattice structures; homogenisation; additive layer manufacturing; characterization; finite ele ent method 1. Introduction In biomechanics, current solutions for bone, dental an orthopedic implants are based on components made of metal alloys such a titanium alloys. These materials provi e excellent resista ce to corrosion in a biological reactive environment, biocompatibility, fatigue resistance, and high strength-to-weight ratios compared to other solutions. © 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. 1. Introduction

* Corresponding author. Tel.: +39.011.0906912; fax: +39.011.0906999. E-mail address: giorgio.depasquale@polito.it * Correspon ing author. Tel.: +39.011.0906912; fax: +39.011.0906999. E-mail address: giorgio.depasquale@polito.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

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

2452-3216 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.009