PSI - Issue 3

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 3 (2017) 508–516 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 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 IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Ductile fracture assessment of X65 steel using damage mechanics Gabriel Testa a *, Nicola Bonora a , Domenico Gentile a , Antonio Carlucci b , Yazid Madi c a Università di Cassino e del Lazio Meridionale, Cassino I-03043, Italy b SAIPEM SA, Montigny-le-Bretonneux F-78180, France c EPF-Ecole d'ingénieurs / MINES ParisTech, Paris F-75006, France Abstract Strain-based design for offshore pipeline requires a considerable experimental work aimed to determine the material fracture toughness and the effective strain capacity of pipe and welds. Continuum damage mechanics can be used to limit the experimental effort and to perfor most of the assessment analysis and evaluation at simulation level. In this work, the possibility to predict accurately ductile rupture in X65 class steel for offshore application, using a CDM model, is shown. The procedure for material and damage model parameters identification is presented and applied to X65, customer grade steel. Then, damage model predictive capabilities have been validated predicting ductile crack growth in SENB and SENT fracture specimen. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Com ittee of IGF Ex-Co. Keywords: Ductile fracture; X65 steel; Damage mechanics. 1. Introduction Pipelines transporting fuel in remote areas can be subjected to deform tion well b yond el stic limit of the material. Under uch conditions, st ng h, toughness and the ability to deform of pipe and weld metal are also decisive for the design. Traditionally, most of pipeline installations worldwide have been designed in accordance to stress based design principles that pose restrictions in terms of pipe material, property requirements and weld procedure qualification procedures (Yoosef-Ghodsi, 2015). Pipelines in arctic areas are exposed to challenging loading conditions such as permafrost, fault crossings, and ice scouring, which can impose localized high strain. Today, strain based-design is used to guarantee that line pipe sections should be able to deform beyond the elastic range without a a a b c a 8180, France rial un er respo sibilit t fic 1. Introduction a a p a gs, a g, which can impose localized high strain. Today, strain © 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.: +39.07762993693. E-mail address: gabriel.testa@unicas.it

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 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 IGF Ex-Co. 10.1016/j.prostr.2017.04.057