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) 1845–1852 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 il l li t . i i t. t t l t rit 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 Mode II loading in sharp V-notched components: a comparison among some recent criteria for brittle fracture assessment Alberto Campagnolo a , Filippo Berto b,c *, Dominique Leguillon d a Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131, Padova (Italy) b Department of Management and Engineering, University of Padova, Stradella San Nicola 3, 36100, Vicenza (Italy) c Department of Engineering Design and Materials, NTNU, Richard Birkelands vei 2b, 7491, Trondheim, (Norway) d Institut Jean Le Rond d’Alembert, CNRS UMR 7190, Sorbonne Universités, UPMC Université Paris 06, 75252 Paris Cedex 0 5 (France) Different criteria are available in the literature to assess the fracture behaviour of sharp V-notches. A typical and well-known criterion is based on the application of the notch stress intensity factors (NSIFs), which are able to quantify the intensity of the stress fields ahead of the notch tip. This work considers two recent energy-based criteria applied here to sharp V-notches. The first criterion is based on the averaged value of the st ain nergy density (SED), while the second one called Fini Fracture Mechanics (FFM) criterion is available under two different formulations: that by Legui lon et al. and that by C rpinteri t al. Considering the averaged SED criterion, a n w expressio for stimating the control r dius R c un er pu e M de II loading is proposed and compared with the sound expression v lid un er pure Mode I loading. With reference to p r M de II loading the critical NSIF at f ilure can b expressed as a fun tion of the V-notch opening angle. By adopting the three criteria considered here the expressions for the NSIFs are derived and compared. After all, the approaches are employed considering sharp V-notched brittle components under in-plane shear loading, in order to investigate the capability of each approach for the fracture assessment. With this aim a bulk of experimental data taken from the literature is used for the comparison. a b, Leguillon a t t f t i l i i , i it f , i i , , t l b t t f t i i , i it f , t ll i l , , i t l c t t f i i i t ial , , i i l i , , i , d tit t l t, , i it , i it i , i i t it i il l i t lit t t t t i t . t i l ll it i i t li ti t t t i t it t , i l t ti t i t it t t i l t t ti . i i t t it i li t t . i t it i i t l t tr i e it , il t ll i ite t i it i i il l t i t l ti : t t ill t l. t t i t i t l. i i t it i , i ti ti t t l i l i i it t i li l i . it t l i t iti l t il ti t t i l . ti t t it i i t i t i . t ll, t l i i t ittl t i l l i , i t i ti t t ilit t t t. it t i i l i t l t t t lit 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://creativ commons.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. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. h t . li l i . . Peer revie d ponsibility of the Scientific Committee of CF21. Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: sharp V-notch; brittle failure; in-plane shear loading; notch stress intensity factor; strain energy density. t ; ittl il ; i l l i ; t t i t it t ; t i it .

* Corresponding author. Tel.: +390444998747; fax: +390444998888. E-mail address: berto@gest.unipd.it i t . l.: ; : . il t t. i .it

* 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. l i . . i i ilit t i ti i itt . t . li

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.2016.06.232