PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 221 –2215 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 Strain-life fatigue curves on the basis of shear strains from torsion Andrzej Kurek a *, Marta Kurek a , Tadeusz Łagoda a a Opole University of Tech nology, ul.Mikołajczyka 5, 45 -271 Opole Abstract The study is about the determination of the fatigue life curves for strain-controlled torsional loads on the basis of 6082-T6 aluminium alloy experimental data. ‘Diabolo’ type full sp ecime s have been tested on newly designed test stand. Tree models and two fitting methods were used to determine strain-life curve constraints. The models used in this paper were: Kandil, Langer and recently proposed Kurek- Łagoda. And the methods were sta ndard least squares approach and bisquare waged approach. MATLAB software was used for curve fitting for this article. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue characteristics, strain-life curve, torsion, shear strain; 1. Introduction The subject of material fatigue is an important issue in our economy every day. The effects of torsion, tension and bending are known virtually in each branch of industry, more by Kurek et al. (2016), therefore it is not a surprise th t these t ree loading states are lso considered with reference to material fatigue for example in Kurek et al. (2014), Kulesa et al. (2016a) r Wal t et al. (2015). This per will cover experimental data from torsional fatigu tests on 6082-T6 aluminium alloy and three strain- lif f tigue curves that don’t need the Ramberg -Osgood equation constants to properly describe experimental data for full specimens. These models are Langer, Kandil and Kurek- Łag oda. Regardless of whether the strain comes from tension-compression or torsional loads when analysing the issue of strain- controlled fatigue we can’t forget to mention the Manson -Coffin-Basquin model (MCB) by Basquin (1910), Coffin (1954) and Manson (1965): ECF22 - Loading and Environmental effects on Structural Integrity Strain-life fatigue curves on the basis of shear strains from torsion Andrzej Kurek a *, Marta Kurek a , Tadeusz Łagoda a a Opole University of Tech nology, ul.Mikołajczyka 5, 45 -271 Opole Abstract The study is about the determination of the fatigue life curves for strain-controlled torsional loads on the basis of 6082-T6 aluminium alloy experimental data. ‘Diabolo’ type full sp ecimens have been tested on newly designed test stand. Tree models nd two fitting m th ds were used to d termine strain-life curve constraints. Th models used in this paper were: Kandil, Langer recently propose Kurek- Łagoda. And th methods were sta dard least squares approach and bisquar waged approach. MATLAB software was used for curve fitting for this article. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue characteristics, strain-life curve, torsion, shear strain; 1. Introduction The subject of material fatigue is an important issue in our economy every day. The effects of torsion, tension and bending are known virtually in each branch of industry, more by Kurek et al. (2016), therefore it is not a surprise that these three loading states ar also considered with referenc to mater al fatigue for example in Kurek et al. (2014), Kulesa et al. (2016a) or Walat et al. (2015). This paper will cover experimental data from torsional fatigue tests on 6082-T6 aluminium alloy and three strain- life fatigue curves that don’t need the Ramberg -Osgood equation constants to properly describe experimental data for full specimens. These models are Langer, Kandil and Kurek- Łag oda. Regardless of whether the strain comes from tension-compression or torsional loads when analysing the issue of strain- controlled fatigue we can’t forget to mention the Manson -Coffin-Basquin model (MCB) by Basquin (1910), Coffin (1954) and Manson (1965): © 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.: +48 77 449 84 19. E-mail address: a.kurek@po.opole.pl * Corresponding author. Tel.: +48 77 449 84 19. E-mail ad ress: a.ku ek@po.opole.pl

* 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.

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.2018.12.139