PSI - Issue 6

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Structural-temporal approach and geometry of the fracture zone in spalling Y.V. Petrov a,b * , A.A. Utkin a,b a Institute of Problems of Mechanical Engineering V.O., Bolshoj pr., 61 St. Petersburg, 199178, Russia b St.-Petersburg State University, University Emb, 7-9, St. Petersburg, 199034, Russia Abstract Spalling is one of the main methods of studying the processes taking place in a solid under dynamic stretching. A little explored area is the study of th geom try of the fracture zo e formed as a result f impact loading. It has been experimentally established that the qualitative form of the fracture region depends strongly on the parameters of the applied pulse, such as the rate of growth and fall of the load, amplitude, duration. On the basis of the known experimental results it was shown that the observed unstable behavior of the fracture zone formed in the conditions of spalling can be explained by means of the structural-temporal approach based on the concept of the incubation time of failure. © 201 7 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: dynamic fracture, pulse load, spall, incubation processes 1. Introduction Th phenomenon of spall dest uctio is the asis for on of the main experimental methods for studying the processes occurring in a solid under conditions of rapid dynamic tension. Spallation occurs in the material as a result of the interaction of a compression wave with a free boundary, when the stress in the original wave changes sign due to reflection. In this case, the total stress at some points of the sample can become tensile, which causes a material rupture. As a rule, with qualitative analysis, the so-called acoustic approximation is used to estimate the parameters XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Structural-temporal approach and geometry of the fractur zone in spalling Y.V. Petrov a,b * , A.A. Utkin a,b a Institute of Problems of Mecha ical Engineering V.O., Bolshoj pr., 61 St. Petersburg, 199178, Russia b St.-Petersburg State University, University Emb, 7-9, St. Petersburg, 199034, Russia Abstract Spalling is one of the main methods of studying the processes taking place in a solid u der dynamic stretch ng. A little explor area is the study of the geometry of th fracture zone formed as a result of i pact loading. It has been experimentally established that the qualitative for of th fracture region depends strongly on the a a eters of the applied pulse, such as the rat of growth and fall of the load, amplitude, duratio . On the basis f the known experimental results it was s own that the observed unstable ehavior of the fracture zone formed in th cond tions of spalling can be explained by means of the structural-temporal approach based on the concept of the incubation time of failure. © 201 7 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: dynamic fracture, pulse load, spall, incubation processes 1. Introduction The phenome on of spall destru tion is the basis for one of the main experimental methods for studying the proc sses occurring in a solid under conditions of rapid dynamic te sion. Spallation occurs in the material as a res lt of the interaction of a compr ssion wave with a free boundary, when the stress in the original wave hanges sign due to refl ction. In this case, the total stress at some points of the sample can bec me tensile, which causes a material rupture. As a rule, with qualitative analysis, the so-called acoustic approximation is used to estimate the parameters © 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.: +7-921-320-81-89. E-mail address: yp@yp1004.spb.edu * Correspon ing author. Tel.: +7-921-320-81-89. E-mail address: yp@yp1004.spb.edu

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452- 3216 © 2017 The Authors. Published by Elsevi B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452- 3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.021