PSI - Issue 3

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 3 (2017) 562–57 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 © 2017 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 IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Ultrasonic Fatigue Testing on the Polymeric Material PMMA, Used in Odontology Applications G. M. Domíngu z Almar z a *, A. Gutiérrez Martínez a , R. Hernández Sá chez a , E. C rre Gómez a , M. Guzmán Tapia a , J. C. Verduzco Juárez a Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo(UMSNH), Santiago Tapia No. 403, Col. Centro, Morelia, Michoacán, 58000, México. Abstract Ultrasonic fatigue tests were carried out on the polymeric material PMMA, which is used for dental applications. The resonance condition was obtained by numerical simulation and modal finite element analysis, allowing to determine the dimensions of the hourglass shape testing specimen. The process of fabrication for this polymer was undertaken too, in order to control the properties of testing material. Fatigue tests were implemented on a patented ultrasonic fatigue machine (Patent No. 323948, 2014, Mexico), which has been developed by the corresponding author and is characterized by a new and simple test control using the LabVIEW platform. The testing specimens were immersed in a solution to simulate the effect of human saliva with the corresponding pH, and to limit its degradation by temperature under the very high frequency loading. Thermographic analysis has been implemented too in order to monitoring the testing temperature in real time. Finally, the ultrasonic fatigue endurance was determined for this polymeric material togeth with a general investig tio of the crack initiation and propagation under the described tes ing condi ions. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: Ultrasonic fatigue tests; Polymeric material PMMA; Thermographic analysis; Crack initiation and propagation. 1. Introduction The polymeric material Poly(methyl methacrylate) (PMMA), is one of the most used thermoplastic polymer in the * Corresponding author. Tel.: +52 443 3223500 ‐ 3103; E ‐ mail address: dalmaraz@umich.mx (G.M. Dominguez Almaraz) z a a . © 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 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 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 IGF Ex-Co. 10.1016/j.prostr.2017.04.039