PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedi Structural Integrity 13 8 11–21 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 Embrittlement of RPV metal under long-term irradiation: state of-the-art and challenges Sergiy Kotrechko* GV Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine, 36, Academician Vernadsky Blvd., Kyiv, 03142, Ukraine Abstract Long-term irradiation is one of the harshest operating conditions for structural alloys. RPV metals function just in such conditions. To date, the development of both physical models of radiation embrittlement of RPV steels and engineering methods of lifetime prediction is a challenge for the science of materials’ strength and structural integrity. That's why, this article reviews two main constituents of above problem, namely: ( i ) micro-mech nisms of radiation embrittlement of RPV metal, and, in particular, "late blooming effect”; ( ii ) development of physics-based engineering methods for prediction of RPV integrity during their long-term operation. In addition to the conventional analysis of micro-mechanisms of radiation hardening, the phenomenon of radiation-induced decrease in brittle strength of irradiated metal is discussed. The existing engineering approaches to prediction of RPV integrity under thermal-shock load are summarised. In general, they don’t enable to use directly advances of physics of fracture of the irradiated material. A large “gap” exists today between the physics-based models of metal degradation under irradiation and engineering models for assessment of RPV lifetime. It is shown that proposed engineering version of the Local approach to fracture, may be one of the ways to solve this problem. The results of employment of this approach to predict life-time of WWER-1000 RPVs are presented. © 2018 The Authors. Published by Elsevier B.V. Pe r-review under responsibility of the ECF22 organizers. Keywords: RPV integrity, radiation embrittlement, elevated temperatur s, Local pproach to fracture, RPV lifetime, long-term operation. ECF22 - Loading and Environmental effects on Structural Integrity Embrittlement of RPV metal under long-term irradiation: state of-the-art and challenges Sergiy Kotrechko* GV Kurdyumov Institute for Metal Physics of National Academy of Sciences of Ukraine, 36, Academician Vernadsky Blvd., Kyiv, 03142, Ukraine Abstract L g-term irradiation is one of the harshest operating conditions f r structural alloys. RPV metals fu ct on just in such conditions. To da e, the development of both physical models of radiation embrittlement of RPV steels and eng neer ng m thod of lifetime predictio is a challenge for the science of materials’ strength and structural integrity. That's why, this article reviews two main constituents of above probl m, na ely: ( i ) mi ro-mecha isms of radiati n embrittlement m tal, and, in particular, "late blooming effect”; ( ii ) development of physics-ba ed engineering methods for prediction of RPV integrity during thei long- erm op ration. In addition o the conventional n lysis of micro-me hanisms of rad a on hardening, the henom non of radiation-induced decrease in brittle strength of i radiated m tal is discussed. The existing engin er ng appro ch to red tion of RPV integrity under thermal-shock load are summarised. In gen ral, they don’t enable to use directly advances of physics of fracture of the irrad ated material. A large “gap” exists today between the physics-based models of metal degradation under irradi tion and engineering models for asse sment of RPV lifeti e. It is shown that r pos d engineering version of the Local approach to fracture, may b on of he ways to solve this problem. The results of employment of this approach to predict life-time of WWER-1000 RPVs are presented. © 2018 The Autho s. Publ shed by Elsevi r B.V. Peer- evi w und r responsibil ty of the ECF22 organizers. Keywords: RPV integrity, radiation embrittlement, elevated temperatures, Local approach to fracture, RPV lifetime, long-term operation.

© 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 Th Authors. Published by Elsevie B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. * Correspon ing author. Tel.:+38-044-424-1352; fax:+38-044-424-2561. E-mail address: kotr@imp.kiev.ua (S. Kotrechko). * Corresponding author. Tel.:+38-044-424-1352; fax:+38-044-424-2561. E-mail address: kotr@imp.kiev.ua (S. Kotrechko).

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.2018.12.003