PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1894–19 3 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 Full- and small-scale tests on strain capacity of X80 seamless pipes A. BASTOLA a *, J. WANG a , H. SHITAMOTO b , A. MIRZAEE-SISAN a , M. HAMADA c and N. HISAMUNE c a DNV GL, Palace House, 3 Cathedral Street, London, SE1 9DE, United Kingdom b Nippon Steel & Sumitomo Metal Corporation, 1-8 Fuso-Cho, Amagasaki, Hyogo, Japan c Nippon Steel & Sumitomo Metal Corporation, 1850 Minato, Wakayama City, Wakayama, Japan Application of high-strength steels such as X80 grade may help reduce cost in offshore pipeline projects through wall thickness optimisation and associated install tio costs. To ensure reliability of such application during the pipeline installation and operation stages, further understanding on the strain capacity of girth welds of X80 grade pipes is required. This paper presents details of a research project containing small-scale and full-scale experiments on X80 line pipe specimen containing girth welds. Initial defects are introduced on the Heat Affected Zone (HAZ) and Weld Metal (WM) of the girth welds prior to the test in order to understand their fracture behaviour. The full-scale experimental program includes four-point bending tests with and without internal pressure applied, and reeling tests. Tensile properties of base metal, WM and HAZ are measured. Fracture toughness tests of WM and HAZ are also carried out. No through-thickness crack growth has been observed in the reeling tests and bending tests without internal pressure. However, some bending tests with internal pressure have seen crack growing through the thickness of the girth weld. Results from this study have shed light on the extent of crack growth in the girth welds of X80 pipes as influenced by their initial size, location, and internal pressurization. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of he Sci ntific Committee of ECF21. Keyw rds: X80; line pipes; fracture mechanics, full-scale test; girth weld 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. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Deep water pipelines must withstand extremely high external pressures at high water depth. Pipe materials with enhanced properties such as better toughness, elongation and strain capacity can be more attractive in deep water.

* Corresponding author. Tel.: +44 20 3816 4213 E-mail address: ajit.bastola@dnvgl.com

* 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. 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.2016.06.238