PSI - Issue 13

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 Structu al Integrity 13 (2018) 367–372 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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 Effects of increased span on fracture toughness using non-standard PCVN specimens and implications for the reference temperature, T 0 Vitor Scarabeli Barbosa a , Claudio Ruggieri a 0F * a Department of Naval Architecture and Ocean Engineering, University of São Paulo, São Paulo/SP, Brazil Abstract This work addresses an experimental investigation on the effects of increased span on the cleavage fracture behavior for an ASTM A572 high strength, low alloy structural steel using non-standard PCVN configuration. Fracture toughness testing conducted on PCVN specimen configurations with varying specimen span provides the cleavage fracture toughness in terms of the J -integral at cleavage instability, J c . The experimental results show a rather marked effect of increased span on J c -values which can help to mitigate the effects of constraint loss commonly observed in PCVN specimens. An exploratory application to evaluate the reference temperature, T 0 , based on the Master Curve methodology also provides additional support for using non standard PCVN specimens in routine procedures to assess fracture toughness behavior of ferritic materials. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: cleavage fracture behavior; non-standard precracked Charpy specimen; constraint effects; reference temperature; master curve 1. Introduction Structural integrity assessments of reactor pressure v ssels (RPVs) remain essential for the continued and safe operation of nuclear power plants. In particular, neutron irradiation embrittlement of the vessel material surrounding the reactor core represents one of the most important mechanisms of degradation in existing commercial nuclear power plants. In these radiation-sensitive carbon and low alloy steels, high-energy neutrons impacting the RPV material strongly affect fine-scale microstructural features thereby promoting increased ductile-to-brittle transition (DBT) temperatures and decreased fracture toughness (Odette and Lucas, 2001). To facilitate experimental ECF22 - Loading and Environmental Effects on Structural Integrity Effects of increased span on fracture toughness using non-standard PCVN specimens and implications for the r ference temperature, T 0 Vitor Scarabeli Barbosa a , Claudio Ruggieri a 0F * a Department of Naval Architecture and Ocean Engineering, University of São Paulo, São Paulo/SP, Brazil Abstract This work addresses an experimental investigation on the effects of increased span on the cleavage fracture behavior for an ASTM A572 high strength, low alloy structural steel using non-standard PCVN configuration. Fracture toughness testing conducted on PCVN specimen configurations with varying specimen span provides the cleavage fracture toughness in terms of the J -integral at cleavage instabil ty, J c . Th experimental r sults show a rather mark d ffect of increased span on J c -values which can help to mitigate the effects of constraint loss commonly observed in PCVN specimens. A exploratory application to evaluate the reference temperature, T 0 , based on the Master Curve methodology also provides additional supp rt for using non stand rd PCVN spe im ns in ro tine procedures to asses fract re toughness behavior of ferritic materials. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: cleavage fracture behavior; non-standard precracked Charpy specimen; constraint effects; reference temperature; master curve 1. Introduction St uctural integrity assessments of reactor pressure v ssels (RPVs) remain esse tial for th continued and afe operation of nuclear power plants. In particular, neutron irradiation embrittlement of the vessel material surrounding the reactor core represents one of the most important mechanisms of degradation in existing commercial nuclear power plants. In these radiation-sensitive carbon and low alloy steels, high-energy neutrons impacting the RPV material strongly affect fine-scale microstructural features thereby promoting increased ductile-to-brittle transition (DBT) temperatures and decreased fracture toughness (Odette and Lucas, 2001). To facilitate experimental © 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.:+55-11-30915184; fax:+55-11-30915717. E-mail address: claudio.ruggieri@usp.br * Corresponding author. Tel.:+55-11-30915184; fax:+55-11-30915717. E-mail ad ress: claudio.ruggieri@usp.br

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.2018.12.061