PSI - Issue 10

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 Structu al Integrity 1 (2018) 211–218 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 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 Hydraulic mortars for joining archaeological stone fragments – A methodological approach I. Karatasios*, M. Amenta, V. Kilikoglou Institute of Nanoscience and N notechnology, N.C.S.R. “Demokritos”, Athens, 15310 , Greece Abstract A methodological approach, followed for th development of compatible repair mortars, for joining archae logical stone fragments of marl limestones, is presented. The development of compatible mort rs for joining archaeological stone fragments requires an in depth study of mechanical and microstructural properties of both stone substrate and mortar mixtures. Therefore, this work focuses on the evaluation of the stone-repair mortar interface, based on the interpretation of mechanical properties of both individual stone and mortar specimens as well as, of joined stone specimens with different types of adhesive mortar mixtures. The cementing material used in the different repair mixtures was: white cement, natural hydraulic lime and lime-metakaolin mixed binder. The binders were further modified with metakaolin to adjust hydraulicity and mechanical strength. The evaluation of adhesion strength and compatibil ity parameters was based on unconfined compression, three-point flexural bending and four point bending tests. It was shown that mechanical properties of join mortars can be adjusted by modifying the binder chemistry. Moreover, it was proved that adhesion strength is more relevant to the total surface area and porosity of the binder rather than compressive strength of the mortar. © 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-n /3.0/). Peer- evi w under responsibility of the scientific committe of the 1 st International Confer nce of the Greek Society f Exp ime tal Mechanics of Materials Keywo ds: Re air mortars; adhesion st ength; comp tibility; join m rtars; archaeological stone; stone-mortar int rface 1. Introduction The selection of appropriate mortar mixtures for joining fragmented stone blocks, especially without reinforcement, is a complex process, since the mechanical behavior of the two materials should be matched while, mortar joints act as 1 st . , . , . 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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/ - - / . /). r- i r r i ilit f t i tifi itt f t e 1 st Int r ti l f r f t r i t f i t l i f t ri l r s: p ir rt rs; si str t ; ti ilit ; j i rt rs; r l i l st ; st - rt r i t rf . i l ti i t t i t j i i t t l , i ll it t i t, is a complex proc , i t i l i t t t i l l t il , t j i t t © 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.: +030 210 650 3326; fax: +030 210 651 9430. E-mail address: i.karatasios@inn.demokritos.gr Received: May 09, 2018; Received in revised form: July 23, 2018; Accepted: July 30, 2018 rr s i t r. l.: ; f : . - il r ss: i. r t si s i . rit s. r i i r is f r : J l , ; t : J l , i : , ;

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.2018.09.030 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 r . li l i r t . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /). r-r i r r i ilit f t i tific itt f t st I t r ti l f r f t r i t f ri t l i f t ri l * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt