PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1336–1341 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 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 B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Influence of ultrafine-grained structure produced by equal-channel angular pressing on the dynamic response of pure copper Iv n S irnov a, *, Alex nder Konstantinov b a Saint Petersburg University, 7/9 Universitetskaya nab., Saint Petersburg, 199034, Russia b Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, 603950, Russia Abstract Metallic materials with a nanocrystalline or ultrafine-grained (UFG) structure can exhibit increased strength, albeit with reduced ductility. The behaviour su materials under high-speed and impact loads ha been insufficiently explored. This work presents experimental results on the dynamic response of UFG pure copper (99.95%) processed by equal-channel angular pressing (ECAP) in comparison with its initial coarse-grained (CG) structure. The yield strength in the case of compression tests of cylindrical samples and the energy consumed for deformation and fracture in the case of a three-point bending of a beam with a V-notch are considered. The UFG copper has higher yield strength in compression tests, but its sensitivity to the loading rate is significantly less than that of the CG initial material and depends on the number of ECAP passes. The UFG material shows higher impact toughness KCV and energy consumption for the entire process of deformation and fracture under impact three-point bending. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 org niz rs. Keywords: ult afin -grained; equal channel angular pre sing; pure copper; dynamic compr ssion; dyna ic bending; yield s ress; consumed energy. Nanocrystalline (NC, up to 100 nm) and ultrafine-grained (UFG, 100 – 1000 nm) structures can lead to increased mechanical characteristics of metals and alloys in comparison with coarse-grained (CG, m ore than 1 μm) structure s (Meyers et al., 2006), for example, high tensile strength, yield strength, hardness, fatigue strength, and so on. Such improved properties of NС and UFG materials make them attractive for structural applications with increased requirements. However, modern constructions and devices are often operated in conditions of intense high-speed and ECF22 - Loading and Environmental effects on Structural Integrity Influence of ultrafine-grained structure produced by equal-channel angular pressing on the dynamic response of pure copper Ivan Smirnov a, *, Alexander Konstantinov b a Saint Petersburg University, 7/9 Universitetskaya nab., Saint Petersburg, 199034, Russia b Lobachevsky Stat University of Nizhni Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, 603950, Russia Abstract Metallic materials with a nanocrystalli e or ultrafine-grained (UFG) structure can exhibit increased strength, albeit with reduced ducti ity. The behaviour of such mater als under h gh speed and impac loads has b en insufficiently explored. This ork presents exper mental results n he dynamic r spons of UFG p re copper (99.95%) processe by equal-channel angular pressing (ECAP) in comparison with i initial coarse-grained (CG) structure. The yield strength in the case of compression tests of cylindrical samples and the energy con umed for deformation and fract re in the cas of a three-point bending of a beam with a V-notch are on idered. The UFG copper has higher yi ld strength i compress on t sts, but its sensitiv ty to the loading r te is significantly less tha that of the CG ini ial material and depends o e umbe of ECAP passes. The UFG materia shows higher mpact toughness KCV and en rgy consumption for the entire process of deformation and fracture und r impact three-point bending. © 2018 The Aut ors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: ultrafin -grained; equal channel angular pressing; pure copper; dynamic comp ssion; dynamic bending; yi ld stress; consumed energy. 1. Introduction Nanocrystalline (NC, up to 100 nm) and ultrafine-grained (UFG, 100 – 1000 nm) structures can lead to increased mechanical characteristics of metals and alloys in comparison with coarse-grained (CG, m ore than 1 μm) structure s (Meyers et al., 2006), for exa ple, high tensile strength, yield strength, hardness, fatigue strength, and so on. Such improved properties of NС an UFG materials mak them attractive for structural applications with increased requirements. However, modern constructions and devices are often operated in conditions of intense high-speed and © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers. * Corresponding author’s E-mail : i.v.smirnov@spbu.ru * Corresponding author’s E-mail : i.v.smirnov@spbu.ru

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 B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.280