PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1343–135 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Indentation of thin copper film using molecular dynamics and p ridynamics Aylin Ahadi*, Per Hansson, Solveig Melin Division of Mechanics, Lund University,P.O. Box 118, 22100 Lund, Sweden In this study we investigate the efficiency of peridynamics to reproduce results from molecular dyn mic simulations f nanoindentation of thin single-crystal fcc copper layers by calibration of material parameters in the peridynamic model. The free ware LAMMPS suppor s both molecular dynamic and peridynamics approach s, an has been used as the common framework. Nanoindentation response for two different crystallographic orientations has been simulated using both numerical approaches and the force-displacement curves from the simulations have been compared between the different approaches. The conclusion is that proper chose of the peridynamic material parameters results in proper reproduction of the molecular dynamic results for the nanoindentationtest. This opens for peridynamic simulations of geometrically more complicated structures to a much lower computational cost, retaining the mechanical response from the atomic scale. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Nano indentation, molecular dynamics, peridynamics, thin films 1. Introduction The development of every-da technology increasingly involves the design and fabrication of devices of smaller and smaller dim nsions, down to the na ometer length scale. For simulations and calculations at the nanoscale molecular dynamic models are often used. For many, except for the smallest systems, molecular dynamic (MD) models are computationally too expensive and time consuming, whereas classical continuum mechanics models fails to accurately resolve the observed nanoscale phenomena occurring. One modelling strategy is to continualize the 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Indentation of thin copper film using molecular dynamics and peridynamics Aylin Ahadi*, Per Hansson, Solveig Melin Division of Mechanics, Lund University,P.O. Box 118, 22100 Lund, Sweden Abstract In this study we inve t gat the effi iency of peridynamics to reproduc results from mol cular dynamic simulations of nanoindentation of hin singl -cryst l fcc copper layers by calibrat on of material p rameter i the peridynam c del. Th free w re LAMMPS sup rts b th molecular dynamic and eridynamics approach s, and h s been used as the common fr mework. Nan indentation response for tw diff rent crystallographic orientations has b simulat d using b th numerical approache and the fo ce-displacement curves from th simul tions have been compared b tween the dif erent approaches. The concl sion is that proper chose f the peridynamic mat rial p rameters result in proper reproducti n of the molecular dynamic results for the nanoindentationtest. Th s opens for per dynamic simulations of geometrically more complicated structures to a much lower computational cost, retai ing the mechanical response from the atomic scal . © 2016 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Nano indentation, molecular dynamics, peridynamics, thin films 1. Introduction The develop ent of every-day technology inc easingly involves the design and fabrication f devices of smaller and sm ller di ensions, down to the nanometer length scale. For simul tions and calculations at the nanoscale lecul dynamic models are ofte us d. For any, except for the sm llest systems, olecul r dynamic (MD) models r computationally too expe sive and time co suming, whereas classical continuum me han cs models fails to accurately resolve the observed nanoscale phenomena occurring. One modelling strategy is to continualize the Copyright © 2016 The Aut ors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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. Abstract

* Corresponding author. Tel.: +46 46 223039. E-mail address: aylin.ahadi@mek.lth.se * Corresponding author. Tel.: +46 46 223039. E-mail address: aylin.ahadi@mek.lth.se

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2016 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.171