PSI - Issue 13

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 13 (2018) 947–952 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Plasticity induced heating – an underestimated effect in monotonic and cyclic deformation? Jürgen Bär* University of the Bundeswehr, Institute for Materials Science, 85577 Neubiberg, Germany Abstract The increase of the specimen temperature under monotonic and cyclic loading is investigated on pure copper and an aluminum alloy. The temperature increase under monotonic loading leads to an increase of the strain to failure in copper, whereas in the case of the investigated aluminum alloy the mechanical properties remain unaffected. Under fatigue loading the specimen heating rises with the loading level and the frequency. Measurements of the temperature change within a cycle show, that the influence of the frequency can be ascribed to the time for cooling available in the loading cycle. Especially in materials with localized deformation behavior, an effect of the deformation induced heating on the cyclic lifetime can be expected. © 2018 The Authors. Published by Elsevier B.V. Peer-review under respo sibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction The progression in the field of thermogr phic measurements incre sed the number of investigations undertaken on the therma evolution during m n tonic and cyclic loading of metallic materials. The main part of the investigations is focused on the determination of the fatigue limit based on the increase of the temperature during cyclic loading (La Rosa und Risitano 2000, Meneghetti 2007). In case of monotonic loading the highest temperature is measured in the necking region (Lin und Wagoner 1987). This fact can be used to identify the location of the failure. Only less attention is payed to the influence of the temperature increase on the failure process. In this work, the influence of the plasticity induced heating on the failure under monotonic and cyclic loading on pure copper and an aluminum alloy will be discussed. ECF22 - Loading and Environmental effects on Structural Integrity Plasticity induced heating – an underestimated effect in monotonic and cyclic deformation? Jürgen Bär* University of the Bundeswehr, Institute for Materials Science, 85577 Neubiberg, Germany Abstract The increase of the specimen temperature under monotonic and cyclic loading is investigated on pure copper and an aluminum alloy. The t mperature incr ase und r monotonic loading leads to an incre se of the strain to failure in copper, whereas in the case of the investigated aluminum alloy the mechanical properties remain unaffected. Under fatigue loading the specimen heating rises wit the loading level and th frequency. M asurements of the temperature change within a cycle show, that the influence of the frequency can be ascribe to the tim for cooling available in the loading cycle. Especially in mat rials it localized d formation b havior, an eff ct of th deformation induced he ting on the cyclic lifetime can be expected. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction The progression in the fiel of thermograph c measurements increased number of investigations undert ken on the thermal evolution during mon tonic and cyclic loading of metallic mate i ls. The main part of the investigati s is focused on the determination of the fatigue limit based on the increase of the temperature during cyclic loading (La Rosa und Risitano 2000, Meneghetti 2007). In case of monotonic loading the highest temperature is measured in the necking region (Lin und Wagoner 1987). This fact can be used to identify the location of the failure. Only less attention is payed to the influence of the temperature increase on the failure process. In this work, the influence of the plasticity induce heating on the failure under monotonic and cyclic loading on pure copper and an aluminum alloy will be discussed. © 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 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 o ganizers. * Corresponding author. Tel.: +49-89-6004-2561; fax: +49-89-6004-3055. E-mail address: juergen.baer@unibw.de * Corresponding author. Tel.: +49-89-6004-2561; fax: +49-89-6004-3055. E-mail ad ress: juergen.baer@unibw.de

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.2018.12.177