PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 3467–3474 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 il l li t . i ir t. tr t r l I t rit r i ( )

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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 Review of recent advances in local approaches applied to pre stressed components under fatigue loading P. Ferro a *, F. Berto a , M.N. James b,c , T. Borsato a a University of Padova, Department of Engi e rin and Management, Stradella S. Nicola, 3 I-36100 Vicenza, Italy b School of Marine Science and Engineering, University of Plymouth, Drake Circus, Plymouth, England, United Kingdom c Department of Mechanical Engineering, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa Abstract Fatigue strength of mechanical components in the high cycle regime depends on both the applied loading and the intensity of any residual stress field induced by either non-homogeneous plastic deformation or the solidification of a local portion of material due to welding operations. In presence of geometric variations that are amenable to being modelled as a sharp V-notch, the residual stress distribution near the notch tip is singular and follows the same form as the solution obtained by Williams in 1952 where the intensity of the asymptotic stress field is quantified by the notch stress intensity factor (NSIF). However, the residual stress varies during fatigue loading and a stable value may be reached. Numerical models have been developed for the calculation of the residual NSIFs and their variation under fatigue loading. Taking advantage of these models, new local approaches have also been recently developed which are able to predict the fatigue strength of pre-stressed notched components. The present paper provides a brief review of such recent advances. © 2016 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of ECF21. Keywords: Type y ur keywords he e, separated by semicolons ; 1. Introduction Following the early work by Williams (1952), a large number of studies have been reported that have evaluated the effect of local stress fields on the static and fatigue strength of mechanical components which contain a geometric variation modelled as sharp V-notch. For instance, the fatigue strength of welded joints can be quantified in terms of , , , , . o a , . to a , M.N. b,c , . a a i rsit f , rt t f i ri g t, tr ll . i l , I- i z , It l b l f ri i i ri , i rsit f l t , r ir s, l t , l , it i c rt t f i l i ri , ls l tr lit i rsit , rt liz t , t fri t t ti tr t f i l t i t i l r i t t li l i t i t it f r i l tr fi l i it r - l ti f r ti or the solidificati f l l rti f t ri l t l i r ti . I r f tri ri ti t t r l t i ll r - t , t r i l tr i tri ti r t t ti i i l r f ll t f r t l ti t i illi i r t i t it f t t ti tr fi l i tifi t t tr i t it f t r ( I ). r, t r i l tr ri ri f ti l i t l l r . ri l l l f r t l l ti f t r i l I t ir ri ti r f ti l i . i t f t l , l l r l r tl l i r l t r i t t f ti tr t f r - tr t t . r t r r i ri f r i f r t . t r . li l i r . . r-r i r r i ilit f t i tifi itt f . r s: r r s r , s r t s i l s ; . i Following the early work by Williams (195 , l stu i t t t l t t t l l t i l t t ti ti t t i l t i t i t i 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. © 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.

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* 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. - t rs. lis ls i r . . r-r i r r i ilit f t i tifi itt f . * Corresponding author. Tel.: +39 0444 998769; fax: +39 0444 998888. E-mail address: ferro@gest.unipd.it rr s i t r. l.: ; f : . st. i .it - il r ss: f rr

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.2016.06.432