PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 2527–2534 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2016) 000–000

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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. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.316 ∗ Corresponding author. Tel.: + 49-381-498-9344 ; fax: + 49-381-498-9342. E-mail address: robert.hannemann@uni-rostock.de 2452-3216 c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. For an e ffi cient calculation of the remaining lifetime of cracked structures an analytical crack propagatio simula tion is normally used (Sander et al. (2010); Zerbst et al. (2011); Beretta et al. (2004)). This requires the knowledge of the crack propagation path and the corresponding stress intensity factor (SIF). Numerical simulation, such as finite element method (FEM), is generally used to calculate the stress intensity fact r solution. For complicated structures, as they occur for example in axles, the SIF solution has been studie for various load situations by di ff erent auth rs, for example Lebahn and Sander (2010), Madia et al. (2008, 2011) and Beretta et al. (2006). However, the SIF solutions are bounded to the respective axles and thus not mutually comparable. ∗ Corresponding author. Tel.: + 49-381-498-9344 ; fax: + 49-381-498-9342. E-mail address: robert.hannemann@uni-rostock.de 2452-3216 c 2016 The Authors. Published by Elsevier B.V. e r-review under responsibil ty of the Scientific Committee of ECF21. o e e e n as s, f n a 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy E ff ect of Specimen Geometry and Press-Fit on the Stress Intensity Factor Solution for Scaled Wheelset Axles under Bending R. Hannemann ∗ , M. Sander a Institute of Structural Mechanics (StM), University of Rostock, Albert-Einstein-Str. 2, 18055 Rostock, Germany Abstract One problem in wheelset axles are the failures due to th propagati n of fatigue crack . To a oid those failures with sometimes catastrophic consequences analytical crack propagation simulations are used. For these simulations the knowledge of the crack propagation path and the corresponding stress intensity factor (SIF) is required. To calculate the SIF a numerical simulation, such as finite element method (FEM), is generally needed. To this end numerical simulations for shouldered solid shafts with elliptical surface cracks are done. In this work di ff erent influencing factors of the stress intensity factor expressions have been identified. Therefore, two di ff erent specimen types with three di ff erent stress concentration factors each were designed. The results represent an overview for the interaction of stress concentration factor, crack depth, crack aspect ratio, bending and press-fit load in shouldered solid shafts. To represent the rotation, di ff erent characteristic angular positions for one selected characteristic crack geometry have been considered. c 2016 The Authors. Published by Elsevier B.V. Pe r-r v ew under res on ibility of the Scientific Committee of ECF21. Keywords: inspection, wheelset axles, rotating bending, stress intensity factor 1. Introduction In order to prevent damage cases of wheelset axles regular inspections with non-destructive testing methods are performed. The definition of appropriate inspection intervals is possible using a reliable computed remaining lifetime prediction. In contrast t the crack propagation models of thin sheet metal structures from the aerospace industry the models for calculating the remaining lifetime of thick-walled shaft structures are still under research. For an e ffi cient calculation of the remaining lifetime of cracked structures an analytical crack propagation simula tion is normally used (Sander et al. (2010); Zerbst et al. (2011); Beretta et al. (2004)). This requires the knowledge of the crack propagation path and the corresponding stress intensity factor (SIF). Numerical simulation, such as finite element method (FEM), is generally used to calculate the stress intensity factor solution. For complicated structures, as they occur for example in axles, the SIF solution has been studied for various load situations by di ff erent authors, for example Lebahn and Sander (2010), Madia et al. (2008, 2011) and Beretta et al. (2006). However, the SIF solutions are bounded to the respective axles and thus not mutually comparable. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy E ff ect of Specimen Geometry and Press-Fit on the Stress Intensity Factor Solution for Scaled Wheelset Axles under Bending R. Ha nemann ∗ , M. Sander a Institute of Structural Mechanics (StM), University of Rostock, Albert-Einstein-Str. 2, 18055 Rostock, Germany Abstract One problem in wheelset axles are the failures due to the propagation of fatigue cracks. To avoid those failures with sometimes catastrophic consequences analytical crack propagation simulati ns are used. For these simulations the knowledge of the crack propagation path nd the corresponding str ss intensity facto (SIF) s requ r d. To calculate the SIF a numerical simulation, such as finite element method (FEM), is generally needed. To this end numerical simulations for shouldered solid shafts with elliptical surface cracks are done. In this work di ff erent influencing factors of the stress intensity factor expressions have been identified. Therefore, two di ff erent specimen types with three di ff erent stress concentration factors each were designed. The results represent an overview for the interaction of stress concentration factor, crack depth, crack aspect ratio, bending and press-fit load in shouldered solid shafts. To represent the rotation, di ff erent characteristic angular positions for one selected characteristic crack geometry have been considered. c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: insp ction, wheelset axles, rotating bending, stress intensi y factor 1. Introduction In order to preve t damage cases of wheelset axles regular inspections with non-destructive testing methods are erformed. The definition of appropriate inspection intervals is possible using a reliable computed remaining lifetime pre iction. In contrast to the crack propagation models of thin sheet metal structures from the aerospace industry the models for calculating the remaining lifetime of thick-walled shaft str ct res are still under research. e On c h e i r , i g P f r d m Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). r-review under responsibility of the Scientific Committee of ECF21. © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt