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) 129–134 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

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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 On the experimental investigation of pozzolanic lime mortar stress-strain behavior and deformation characteristics when subjecte to unlo din -reloading cycles K. Kaklis a, *, Z. Agioutantis b , S. Mavrigiannakis a , P. Maravelaki-Kalaitzaki c α School of Mineral Resources Engineering, Technical University of Crete, Chania 73100, Greece b Department of Mining Engineering, University of Kentucky, Lexington, Kentucky 40506, USA c School of Architectural Engineering, Techni al University of Cret , Chania 73100, Greece Abstract Two series of uniaxial and triaxial compression tests using unloading-reloading cycles (cyclic loading) were performed under different confining pressures, in order to study the stress-strain and the deformation behavior of pozzolanic lime mortar subjected to cyclic loading. A cyclic loading scheme with five loops in the pre-peak region was performed for each test. The experimental results showed that the ratio of plastic strain to total strain is very large in the case of the triaxial compression tests. The marked Young’s modulus degradation behavior in the pre-peak region is related to damage that occurs in each specimen. Future work will aim to experimentally investigate the post-peak region behavior of th material. © 2018 The Authors. Published by Els vier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/license /by-nc- d/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 Keywords: Pozzolanic lime mortar; stress-strain behavior; cyclic loading; plastic strain; Yo ung’s mo dulus degradation s s e st r

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introductio

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. In a previous research study by Kaklis t al. (2018) the mechanica properties of a pozzolanic lime mortar consisting of carbonate sand, hydrated lime and metakaolin (ML) were experimentally investigated. This type of pozzolanic mortar, often used as joint material in restoration applications (Veiga et al. (2009); Aggelakopoulou et al. e l

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* Corresponding author. Tel.: +30 28210 37385; fax: +30 28210 37583. E-mail address: kaklis@mred.tuc.gr Received: April 29, 2018; Received in revised form: July 19, 2018; Accepted: July 27, 2018

* 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 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.2018.09.019 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 sci ntific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials