PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 886–889 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 Dependence of strength characteristics of aluminum alloys on strain rate under tension Alexey Evstifeev a *, Anastasiia Chevrychkin a,b , Yuri Petrov a,b , Svetlana Atrochenko a,b a St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia b Institute of Problems of Mechanical Engineering, Russian Academy of Sciences,Bolshoi pr. 61, St. Petersburg, 199178, Russia Abstract The study presents the results of investigation for different alumin m alloys. Small samples of these materials were subjected to static and dynamic t sion. A numerical analysis using an incubation time fracture criterion has been c rried out. For each material a set of fixed constants were obtained that allows determine the dependencies of the tensile strength of material in a wide range loading conditions. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Tension, dynamic, analysis, aluminum alloy. 1. Introduction Aluminum alloys are widely used in engineering applic tions, for which it is necessary to have high strength and low weight. Investigation of materials strength properties as usual includes series of tension, compression or bending experiments in quasi static loading conditions. Use of these alloys in structures subjected to shock loads is difficult due to the limited amount of data on the effect of structure-time conditions of loading on the mechanical characteristics of these alloys, without a knowledge of which it is impossible to achieve good operational characteristics. Another aspect of the application of materials in engineering devices of high level it is a possibility improvement of strength and p rfo mance properti s. The most promising way to increase the reliability of equipment can be the improvement of strength characteristics of a selected material via the fining of its microstructure using severe plastic ECF22 - Loading and Environmental effects on Structural Integrity Dependence of strength characteristics of aluminum alloys on strain rate under tension Alexey Evstifeev a *, Anastasiia Chevrychkina a,b , Yuri Petrov a,b , Svetlana Atrochenko a,b a St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia b Institute of Problems of Mechanical Engine ing, Russian Academy of Sciences,Bolshoi p . 6 , St. Peter burg, 199178, Russia Abstract The study pres nts the results of investi ation for different aluminum alloys. Small samples of these materi l were subjected to static and dynamic tension. A num rical analysis using an incubation time fracture criterion has been carried out. For each m teri l a set of fixed constants were obtained that allows determine the dependencies of th te sile strength of material in a wide range loading conditions. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Tension, dynamic, analysis, aluminum alloy. 1. Introduction Aluminum alloys are widely used in engineering applications, for which it is necessary to have high strength and low weight. Investigation of materials strength properties as usual includes series of tension, compression or bending experiments in quasi static loading conditions. Use of these alloys in structures subjected to shock loads is difficult due to the limited amount of data on the effect of structure-time conditions of loading on the mechanical characteristics of these alloys, without a knowle ge of which it is impossible to achieve good operational characteristics. Another aspect of the application of ma erials in engineering devices of high level it is a possibility improvement of strength and performance properties. The most promising way to increase the reliability of equipment can be the improvement of strength characteristics of a selected material via the fining of its microstructure using severe plastic © 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.: +7 921-432-1524. E-mail address: ad.evstifeev@gmail.com * Corresponding author. Tel.: +7 921-432-1524. E-mail ad ress: ad.evstifeev@gmail.com

* 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.2018.12.167