PSI - Issue 10

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 1 (2018) 3 3–31 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Relation between damage processes of reinforced concrete under uniaxial compression and electric response to pulsed mechanical impact M. Petrov*, T. Fursa, D. Dann National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk 634050, Russia Abstract The main regularities of the relation between the actual destruction of reinforced concrete samples under uniaxial compression and the characteristics of fracture mechanics and indirect physical parameters are investigated in this work. Studies of samples with different types of reinforcement and different strength of concrete are carried out. Destruction stages of reinforced concrete under uniaxial compression are established and the corresponding diagnostic criteria of evaluation are proposed. The evaluation procedure is based on measuring the electric response to a weak mechanical impact. Measurements of the electric response are carried out p iodically during a gradual increase of external load. Analysis of signals in the tim and frequency domain is he basis of the algorithm used for evaluating the degradation pr cesses of reinforced concrete under un axial com ression. © 2018 The Aut ors. Published by Elsevier Ltd. This is an open access article under th CC BY-NC-ND license (http://creativecommons.org/li ens /by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experime tal Mechanics of Materials Keywords: Reinforced concrete; uniaxial compression; deformation; fracture; mechanoelectric transfor ations; nondestructive testing t ti l l t i i it , , i , , i i l iti t l ti t t t l t ti i t l i i l i t t i ti t i i i t i l t i ti t i t i . t i l it i t t i t i t t t t i t. t ti t i t i i l i t li t i i ti it i l ti . l ti i i t l t i t i l i t. t t l t i i t i i ll i l i t l l . l i i l i t ti i i i t l it l ti t ti i t i l p i . t . li l i t . This is an open access article under the CC BY-NC-ND license (http://creativecommon . /li / nc- /3. / . i under responsibility t i ti i itt the 1 st I ternational Con the Greek Society of Ex i nt l i t i l : i f r r t ; i i l r i ; f r ti ; fr t r ; l tri tr f rm ti ; tr ti t ti

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© 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. Cracks are formed and developed in concrete during long-term operation of static and dynamic mechanical stresses. Consequ ntially, the cr cks lead to an unexpect d destruction of the structure. In such conditions, the problem l i t i l t ti t ti i i l ti ll , t l t t t ti t t t . iti , t l t .

* Corresponding author. Tel.: +7 3822 606 333 E-mail address: mvp17@tpu.ru Received: April 27, 2018; Received in revised form: July 18, 2018; Accepted: July 26, 2018 rr i t r. l.: - il : t .r t : l , i : ril , ; i i i f : l , ;

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.042 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials t . li l i t . i i ti l t li tt :// ti . /li / / . / . i i ilit t i ti i itt t st t ti l t i t i t l i t i l * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt