PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1539–1544 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t grity 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. ECF22 - Loading and Environmental effects on Structural Integrity Stochastic Service Life Prediction of Existing Steel Structure Loaded by Overhead Cranes Petr Lehner a , Vít Křivý b* , Martin Krejsa a , Přemysl Pařenica a , Jaroslav Kozák c a VSB-Technical University of Ostrava, Faculty of Civil Engineering, Department of Structural Mechanics, Ludvíka Podéšt ě 1875/17, 708 33 Ostrava-Poruba, Czech Republic b VSB-Technical University of Ostrava, Faculty of Civil Engineering, Department of Building Constructions, Ludvíka Podéšt ě 1875/17, 708 33 Ostrava-Poruba, Czech Republic c Vitkovice ENVI a.s., R ska 1142/30, 703 00 Ostrava-Vitkovice, Czech Republic Abstract The article deals with the fatigue damage analysis of aging steel structures. The structure was built in 1920 and is used to operate an outdoor storage of steel rolled products. The structure serves as a support for overhead cranes with a lifting capacity of 8 tons. Reliability assessment including prediction of the residual service life was requested by the property owner. Corrosion state of structural elements and assessment of fatigue resistance represent the key data for the prediction of the residual service life. The study of the documentation and the inspection of structure was the first steps of the analysis. Next, the computational n merical model of the teel bar structure was prepared to identify the critical details for the fatigu ass ssment. The detailed numerical model of the selected s ructural part was used subsequently to check th fatigue r sistance. In this article, special attention is paid to the calculation of load ef ects resulting from he operation of overhead cranes. A new innovativ metho based o h Monte-Carlo simul tions and FEM mod l of the structur was used to det rmine the stress history. The following random variables enter the probabilistic analysis: (a) position of the crane bridge, (b) position of the crab, (c) payload, (d) number of crane travels during the evaluated period. I come information for the probabilistic analysis are taken from the technical documentation, skilled judgement of the operation technologist is used as well. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Stochastic Service Life Prediction of Existing Steel Structure Loaded by Overhead Cranes Petr Lehner a , Vít Křivý b* , Martin Krejsa a , Přemysl Pařenica a , Jaroslav Kozák c a VSB-Technical University of Ostrava, Faculty of Civil Engineering, Department of Structural Mechanics, Ludvíka Podéšt ě 1875/17, 708 33 Ostrava-Poruba, Czech Republic b VSB-Technical University of Ostrava, Faculty of Civil Engineering, Department of Building Constructions, Ludvíka Podéšt ě 1875/17, 708 33 Ostrava-Poruba, Czech Republic c Vitkovice ENVI a.s., Ruska 1142/30, 703 00 Ostrava-Vitkovice, Czech Republic Abstract The article deals with the fatigue damage analysis of aging steel structures. The structure was built in 1920 and is used to operate an outdoor storage of steel rolled products. The structure serves as a support for overhead cranes with a lifting capacity f 8 tons. Reliability assessment including re iction of the residual service life was requested by the property owner. Corrosion state of structu al elements a d assessment of fatigue resistance repr sent the key data for the prediction of the residual service life. The study of the documentation and the inspection of structure was the first steps of the analysis. Next, the comp tational numerical model of the steel bar structu was prepared to identify the critical details for the fat gue assessment. The detailed n erical l of t el cted struc ural p rt was us subsequently to check the fatigue resistance. In this article, sp ci l attention is aid to the calculation of load effects resulting from the operatio of overh ad cranes. A new innovative method based on the Monte-Carlo simulations an FEM model of the structure was used to deter ine the stress history. The following random variables enter the probabilistic analysis: (a) position of the crane bridge, (b) position of the crab, (c) pa load, (d) number of crane tr vels during the evaluated period. Income information for th probabilistic analysis are taken from the technical documentation, skilled judgement of the operati n technologist is used as well. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Fatigue life; load-bearing structure; overhead crane; Monte-Carlo simulations; FEM models. Keywords: Fatigue life; load-bearing structure; overhead crane; Monte-Carlo simulations; FEM models.

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

* Corresponding author. Tel.:+420 597 321 391. E-mail address: vit.krivy@vsb.cz * Corresponding author. Tel.:+420 597 321 391. E-mail ad ress: vit.krivy@vsb.cz

* 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.2018.12.314