PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1221–1228 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Theoretical Approach for Developing the Thermographic Method in Ultrasonic Fatigue V. Crupi b , E. Guglielmino b , O. Plekhov a *, A. Prokhorov a , G. Risitano b a ICMM UB RAS, 1 Ak. Koroleva str., 614014 Perm, Russia b University of Messina, Engineering Department, Contrada Di Dio (S. Agata), 98166 Messina, Italy Abstract In the last years, several approaches were developed in literature for predicting the fatigue strength of different kinds of materials. One approach is the Thermographic Method, based on the thermographic technique. This study is devoted to the development of a theoretical approach for modeling of surface and undersurface fatigue crack initiation and temperature evolution during ultrasonic fatigue test. The proposed model is based on the statistical description of mesodefect ensemble and describes an energy balance in materials (including power of energy dissipation) under cyclic loading. The model allows us to simulate the damage to fracture transitio and corresponding temperature evolution in critical cross section of a sample tested in very high cyclic fatigue regime. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: infrared thermography; self-heating test; gigacyclic fatigue regime; very high cycle fatigue; Thermographic Method 1. Introduction It is well known that the metals have a complex structure, which is a hierarchy of different levels. Under d formation proc ss, the s ructural evolution, observed at all scale levels, leads to irreversible deformation and failure. Under gigacyclic fatigue loading, such structural evolution goes under stress amplitude less than the yield stress of materials and fracture occurs under macroscopic “pure” elastic conditions. One of most critical issue of the gigacyclic fatigue is the location of fatigue crack initiation. The decreasing of stress amplitude leads to the 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Theoretical Approach for Developing the Thermographic Method in Ultrasonic Fatigue V. Crupi b , E. Guglielmino b , O. Plekhov a *, A. Prokhorov a , G. Risitano b a ICMM UB RAS, 1 Ak. Koroleva str., 614014 Perm, Russia b University of Messina, Engineering Department, Contrada Di Dio (S. Agata), 98166 Messina, Italy Abstract In the last years, several approaches were developed in literature for predicting the fatigue strength of different kinds of materials. One approach is the Thermographic Method, bas d on the the mographic technique. This study is devoted to the dev lopment of a theoretical approach for modeling of surface and undersu face fatigue crack initiation an temperatur evolution during ultrasoni fatigue test. The proposed model is b sed on the st tistical d s iption of mesodefect ensembl and describes an energy balance in materials (including p wer of en rgy dissipation) under yclic loading. Th model allows us to simulate the damage to fracture transition and corresponding t mperature ev lution in criti a cross section f a s mple tested in ve y high cyclic fatigue regime. © 2016 The Aut ors. P blished by Els vier B.V Peer-review under esponsibility of the Scientific Committee of ECF21. Keywords: infrared thermography; self-heating test; gigacyclic fatigue regime; very high cycle fatigue; Thermographic Method 1. Introduction It is well known that the metals have a complex structure, which is a hierarchy of different levels. Under deformation pr cess, the structur evolution, observed at all scale levels, leads to irreversible deformation and failu e. Under gigacycl c fatigue loading, such structural evo ution go s und r stress amplitude less than the yiel stress of materials and fracture occurs under macroscopic “p re” elastic condition . One of most critical issue of the gigacyclic fatigue is the location of fatigue rack initiation. The decreasing of stress a pli ude le ds to the 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. © 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 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Pee -review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.:+7-342-237-8321; fax: +7-342-237-8487. E-mail address: poa@icmm.ru * Corresponding author. Tel.:+7-342-237-8321; fax: +7-342-237-8487. E-mail address: poa@icmm.ru

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.2016.06.156