PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 554–559 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 Plastic hinge performance of repaired welded joints in steel structures Mihaela Iordachescu a *, Andrés Valiente a , Elena Scutelnicu b a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, España b Manufacturing Engineering Dpt., Dunarea de Jos University of Galati, 111 Domneasca St., 800201, Romania Abstract Technical codes for the design of steel structures allow repaired welded joints, provided that their performance is the same as that of the as-designed new ones. The paper presents the experimental and analytical work carried out to assess the repairing effects on the bearing and rotation capacities of structural welded configurations, alternatively obtained from an as-designed weld or a repaired one. Precracked compact tensile specimens with the resistant ligament located in the heat affected zone (HAZ) were used and their rotation capacity evaluated by means of a plane stress plastic collapse model as a quantitative criterion to assess by compa ison, the effectiveness of the repairing procedure. This permits separation the influences of yielding and ductile fracture resistances in the moment-rotation diagram. The application of the method confirmed the better behaviour of the base metal when comparing it with the HAZs of the tested joints, a d shows that joint performance improve by repairing. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: welded joint; heat affected zone; resistant ligament; plastic collapse; capacity of plastic rotation; 1. Introduction Welded joints are determinant structu al details for the feasibility and safety of steel structures. In the design codes (EAE, 2011 a d Eurocode 3, 2015), monographic chapters are dedicated to the manufacturing procedures and specifications of the welded joints, with special attention being paid to failure by progressive cracking. Suffice to say that out of the 103 structural details that Eurocode 3 (2015) highlights as vulnerable to fatigue, 87 are welded joints. ECF22 - Loading and Environmental effects on Structural Integrity Plastic hinge performance of repaired welded joints in steel structures Mihaela Iordachescu a *, Andrés Valiente a , Elena Scutelnicu b a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, España b Manufacturing Engineering Dpt., Du ar a de Jos University of G lati, 111 Domneasca St., 800201, Romania Abstract Technical codes for the design of steel structures allow repaired welded joints, provided that their performance is the same as that of the as-designed new ones. The paper presents the experimental and analytical work carried out to assess the repairing effects on the b aring and rotation capacities of structural welded configurations, alternatively obtained from an as-designed weld or repaired one. Precracked compact tensile specimens with the resistant igament located in the heat affected zone (HAZ) re used and their rotation capacity evaluated by means of a plane stress plastic collapse model as a quantitative criterion to assess by comparison, the effectiveness of the repairing procedure. This permits separation the influences of yielding and ductile fracture resistances in the moment-rotation diagram. The application of the ethod confirmed the better behaviour of the base m tal when comparing it with the HAZs of the tested joints, and shows that joint performance improves by repairing. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: welded joint; heat affected zone; resistant ligament; plastic collapse; capacity of plastic rotation; 1. Introduction Welded joints are determinant structural details for the feasibility and safety of steel structures. In the design codes (EAE, 2011 and Eurocode 3, 2015), monographic chapters are dedicated to the manufacturing procedures and specifications of the welded joints, with special attention being paid to failure by progressive cracking. Suffice to say that out of the 103 structural details that Eurocode 3 (2015) highlights as vulnerable to fatigue, 87 are welded joints. © 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: orcid.org/000-0003-0545-4581; Tel.: +34 910-673-309; E-mail address: mihaela.iordachescu@upm.es * Corresponding author: orcid.org/000-0003-0545-4581; Tel.: +34 910-673-309; E-mail ad ress: mihaela.iordachescu@upm.es

* 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.2018.12.091