PSI - Issue 5

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 Structu al Integrity 5 (2017) 869–874 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Numerical studies of the residual lifetime of power plant components based on experimental results at elevated temperatures Maria Paarmann*, Patrick Mutschler, Manuela Sander University of Rostock, Institute of structural Mechanics, Albert-Einstein-Str. 2, 18059 Rostock In the future, the energy supply will strongly fl ctuate, which results in more frequently load cycles. For this reason, it is necessary to analyze fatigue crack growth under the aspect of reasonable load cases in relevant power plant components. Therefore, numerical three-dimensional fatigue crack growth simulations for different power plant components have been performed using FRANC3D taking temperature transients and pressure loads as well as different relevant crack positions into account. The results show that the temperature gradient of thermal loadings has a large influence on stress intensity factors (SIF) and may lead to much higher SIF than under pure mechanical loading. In order to quantify the residual lifetime, temperature-dependent fatigue crack growth curves for different stress ratios were experimentally determined. Therefore, experiments with constant temperatures between room temperature and 600°C have been performed using C(T)-specimens cut of a decommissioned high-pressure bypass station made of the ferritic-martensitic steel X20CrMoV12-1. The investigations show that crack growth rates rise in the PARIS regime under higher temperatures. The data were finally used to extract ( N )-curves from numerical result in FRANC3D. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Numerical studies of the residual lifetime of power plant components based on experimental results at elevated temperatures Maria Paarmann*, Patrick Mutschler, Manuela Sander University of Rostock, Institute of structural Mechanics, Albert-Einstein-Str. 2, 18059 Rostock Abstract In the future, the energy supply will strongly fluctuate, which results in more frequently load cycles. For this reason, it is necessary to analyze fatigue crack growth nder the aspe t of r a onabl load cases in relevant power plant components. Therefore, nu erical three-dimensional fatigue crack growth simulations for different power plant components have been performed using FRANC3D taking temperature transients and pressure loads as well as different relevant crack positions into account. The results show that the temperature gradient of ther al loadings has a large influence on st ess intensity factors (SIF) and may lead to much higher SIF than under pure mechanic l loading. In order to quantify the residual lifetime, temperature-dependent fatigue crack growth curves for differ nt stress ratios were experimentally determined. Therefore, experiments with constant temperatures between room temperature and 600°C have been performed using C(T)-specimens cut of a decommissioned high-pressure bypass station made of the ferritic-martensitic steel X20CrMoV12-1. The investigations show that crack growth rates rise in the PARIS regime under higher temperatures. The data were finally used to extract a ( N )-curves from numerical results in FRANC3D. © 2017 The Authors. Published by Els v er B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: thermal loading; power plant components; residual lifetime prediction Keywo ds: thermal loading; power plant components; residual lifetim prediction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.108 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +49-381-498-9340; fax: +49-381-498-9342. E-mail address: maria.paarmann@uni-rostock.de * Corresponding author. Tel.: +49-381-498-9340; fax: +49-381-498-9342. E-mail address: maria.paarmann@uni-rostock.de