PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 43 –437 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 Influence of Activating Flux on the Mechanical Properties of the Plasma Welded Joint of Austenitic Steel Luka Grubiša a , Darko Bajić b , Tomaž Vuherer c, * a Institute for Development and Research in the Field of Occupational Safety, Podgorica 81000, Montenegro b University of Montenegro, Faculty of Mechanical Engineering, Podgorica 81000, Montenegro c University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia Abstract This paper presents the application of activating flux on plasma welded joint on austenitic steel 316L and its influence on mechanical properties of the joint. In addition to standard mechanical tensile tests, hardness measurements, Charpy impact tests, and standardized SENB tests, using elastic-plastic fracture mechanics, were performed as well as crack tip opening was determined. The SENB testing was done according to the ASTM standard E1820-15a and fracture mechanisms was uncovered. The study revealed that the A-plasma welded joint has very good mechanical properties, which confirms the reliability of the weld joint and its high level of quality. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: A-plasma, activating flux, mechanical properties, fracture toughness, impact toughness 1. Introduction Plasma represents an electrically conducting medium. It is ionized gas containing positive and negative particles, which change thei posit on under the influence of electrical field. Due to its physical properties and advanced technology, we are able to contr l movements of plasma medium and its form. ECF22 - Loading and Environmental Effects on Structural Integrity Influence of Activating Flux on the Mechanical Properties of the Plasma Welded Joint of Austenitic Steel Luka Grubiša a , Darko Bajić b , Tomaž Vuherer c, * a Institute for Development and Research in the Field of Occupational Safety, Podgorica 81000, Montenegro b University of Mo enegro, F culty of Mechanical Engineering, Podgorica 81000, Montenegro c University of Maribor, Faculty of Mech nical Engi eering, Maribor, Slovenia Abstract This paper presents the application of activating flux on plasma welded joint on austenitic steel 316L and its influence on mechanical properties of the joint. In addition to standard mechanical tensile tests, hardness measurements, Charpy impact tests, and stand rdized SENB tests, using elastic-plastic fr cture mechanics, were p rformed as well as crack tip opening was determined. The SENB testing was done according to the ASTM standard E1820-15a and fracture mechanisms was u covered. The study revealed that the A-plasma welded joint has very good mech nical properties, which confirms the reliability of th weld joint and its high level of quality. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: A-plasma, activating flux, mechanical properties, fracture toughness, impact toughness 1. Introduction Plasm repre nts an lectrically conducting medium. It s ioniz d gas containing positive and negative particles, which change their position under the influence of electrical field. Due to its physical properties and advanced technology, we are able to control the movements of plasma medium and its form. © 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.: +0-386-31-248-224 E-mail address: tomaz.vuherer@um.si * Corresponding author. Tel.: +0-386-31-248-224 E-mail ad ress: tomaz.vuherer@um.si

* 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.2018.12.072