PSI - Issue 10

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 1 (2018) 249–256 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 il l li i i t t l t it i

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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 o en access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-n /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 Tensile performance of graphene nanoplatelets/glass fabric/epoxy nanocomposite laminae G.V. Seretis*, A.K. Polyzou, D.E. Manolakos, C.G. Provatidis National Technical University of Athens, School of Mechanical Engineering, 9 Heroon Polytechniou Str., 15780 Athens, Greece Abstract In this paper, the tensile performance of hand lay-up produced graphene nanoplatelets (GNPs) reinforced E-glass fabric/epoxy nanocomposite laminae was investigated. The GNPs contents tested were ranging from 1% w.t. to 5% w.t., using an increasing step of 1%. Two different types of E- glass fabric, i.e. Twill 2×2 and Uni -Directional, were used to produce the tested nanocomposite laminae. The tensile response of the produced nanocomposites is being explained by an inter-yarn friction mechanism which takes place at the weaving nodes and it is controlled by the GNPs content in each specimens’ series as well as by the settling of t he GNP onto the surface of the fiberglass fibrils. The analysis showed that the GNPs were located on the fibrils’ surfaces and not in the inter-fibril regions, applying in this manner a direct effect on the frictional behavior of the specimens. The greater the number of weaving nodes of the fabric used is, the gr ater additional friction is applied ue to a specific GNPs content additio . © 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 Keywords: Nanocomposites; mechanical properties; atomic force microscopy (AFM); nanoparticles; tension t ti l i l i it f t , l f i l i i , l t i t ., t , , . . . . ., . , . . , . . , . , d n. t . li l i t . This is an open access articl t e CC li tt :// ti . /li / / . / . i responsibility of the sci ti i itt t st t ti l t i t i t l i t i l Keywords: Nanocomposites; m i l ti ; t i i AF ; ti l s; te ion © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Fiber reinforc d polymers (FRP) are of the most comm nly used composite materials worldwide and, therefore, they have been widely investigated throughout the last few years (Colangelo et al. (2017); Heshimati et al. (2017); Mallick (2008); Murugan et al. (2014)). Their high strength-to-weight ratio, together with their impressive stiffness-to-weight Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction

* Corresponding author: Tel.: +30 210 7721518 E-mail address : gio.seretis@yahoo.com; gseretis@central.ntua.gr Received: April 27, 2018; Received in revised form: July 14, 2018; Accepted: July 20, 2018 i t : l.: il : i . ti . ; ti t l. t .

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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.2018.09.035 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 . . i i ti l t li tt :// ti . /li / / . / . i i ilit t i ti i itt t st t ti l t i t i t l i t i l * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt