PSI - Issue 3

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 Structu al Integrity 3 (2017) 11 –118 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 il l li t . i i 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. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Some recent criteria for brittle fracture prediction under in-plane shear loading A. Campagnolo a , F. Berto b,* , S.M.J. Razavi b , M.R. Ayatollahi c a Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131, Padova, Italy. b Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2b, 7491, Trondheim, Norway. c Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846, Tehran, Iran. Abstract 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 strain energy density (SED), while the second one called Finite Fracture Mechanics (FFM) criterion is available under two different formulations: that by Leguillon et al. and that by Carpinteri et al. Considering the averaged SED criterion, a new expression for estimating the control radius R c under pure M de II loading is proposed and compared with the sound expression valid under pure Mode I loading. With refe ence to pure M de II lo ding the critical NSIF at failure can e expr ssed s a fun tion of the V-no ch opening ang e. By adopting the three criteria considere her th exp essions for the NSIFs are derive and compared. After all, the approac es are employ consideri g s arp 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. b, c a t t f I t i l E ine ri g, U iv r it of P , Via i 1, 3 1 , , It l . b t t f i l I t i l i i , i i it f i l ( ), i i l i , 1, on im, w . c t t f i l i i , I i it f ien an l g , N r , , , I . i t it i il l i t lit t t t t i t . t i l l it i i t li ti t t t i t it t , i l t ti t i t it t t s fi l t t ti . i i t t it i li t t . i t it i i t l of th str i e e gy d it E , w il t e on lled init r t ani F crit i n i a ailable t dif t l ti : t t il t l. t t i t i t l. si in the ra ed S it ri , new r ssio fo ti ti g t c t ol i c e p l i i o d m r d it the d pr ion li er r l i . it re e e e t pur d I l ding t iti l IF t ail c p ss f n ti t t peni a le. y ad ti g t e th ite i nside e t p es i t NS ri p . fter l , the p h m l c ideri g sh V t brit l mpo e t u der i - l n he l in , i rd to i v tigat th bilit e c a the a t se sm nt. With thi ai a b l of eri tal ata t ken fr m t liter t i used f the om i n. © 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. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: sharp V-notch; brittle failure; in-plane shear loading; notch stress intensity factor; strain energy density. © 2 he ut r . Pu li he by l evi r B.V. Pe r- e iew er sponsibilit f th S ie ti i it . : r - t ; rit l f il r ; i - l r l i ; t tr i t it f t r; tr i r it . Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +47-735-93831. E-mail address: filippo.berto@ntnu.no * r i t r. l.: - - . - il s: fili . rt t .

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review u der responsibility of the Scientific Committee of IGF Ex-Co. - t r . li l i r . . r e i un e o i ilit o t S ienti i it .

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.2017.04.019