PSI - Issue 10

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 Structural Integrity 1 8 33–4 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. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Experimental investigation of spur gear strength using photoelasticity K.G. Raptis, A.A. Savaidis* Department of Mechanical Engineering Educators, School of Pedagogical and Technological Education, Athens, Greece Abstract In this work, the maximum stresses, which are developed in the crucial toe section of spur gears being in contact and subjected to loading at the Highest Point of Single Tooth Contact (HPSTC), are numerically and experimentally studied. The results indicate that the deviation between the methods considered increase with increasing number of teeth of the gear, while the teeth number of the pinion remains constant. In addition it is shown that the deviations remain within acceptable limits. © 2018 The Authors. Published by Elsevier Ltd. This is an op n acc ss article un the CC BY-NC-ND license (http://creativ omm ns.org/licenses/by-nc-n /3.0/). Peer-review under responsibi ity of t e scientific comm tt e of the 1 st International Conferen e of the Greek Society of Exper m ntal Mechanics of Materials Keywords: S ur ge r strength;highest point of single tooth contact (HPSTC); lowest point of single tooth contact (LPSTC); polariscope 1. Introduction The significance of toothed gears for power and motion transmission is proved by the fact that they are the machine elements mostly used in a large range of engineering applications. Their mechanical behavior is critical for the per formance of the assembly in terms of reliability and fatigue endurance. A key factor of their behavior is the design of the gear tooth towa ds ptimized str ss distributi n. The proposed work focuses on the experimental investigation of the stress field around a gear tooth subjected to a point load. n this work, the maximum stresses, which are developed in the c c al e Au Elsevier Ltd. . l st p r o o © 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.: +30 210 2896830; fax: +30 210 2896830. E-mail address: asavaidis@aspete.gr Received: April 30, 2018; Received in revised form: July 16, 2018; Accepted: July 24, 2018

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 Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.006 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials t * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt