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) 227–234 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 il l li i i t t l t it 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 Assessing wood adhesives used in conservation by testing their bond strength and ageing behavior E. Tsetsekou*, A. Platanianaki, A. Pournou Dept of Conservation of Antiquities and Works of Art, Technological Educational Institute of Athens, Ag. Spyridonos, 12210 Aegaleo, Greece Abstract The aim of this work was to study omparatively the performance of adhesives commonly u ed in conservation of wooden artefacts of Cultural Heritage. Three natural adhesives, casein, rabbit-skin glue and fish glue, and two synthetic, a copolymer of methyl acrylate and ethyl-methacrylate (Paraloid B72) and a polyvinyl acetate glue (Ravemul M18 - Vinavil), were investigated. Their performance was tested on mock ups made of two different species of wood, Abies alba L. (fir) και Acer pseudoplatanus L. (maple). The adhesives were evaluated for their performance before and after accelerating ageing with UV and RH-T cycles, in relation to bond strength under shear stress. Criteria important in conservation such as reversibility and colour stability were additionally inves tigated in order to get a more complete picture of adhesives ’ performance. The results showed that Paraloid B72 and fish glue demonstrated the highest bond strength. Paraloid B72 and fish glue were also the most reversible, before and after accelerated ageing. In contrast rabbit-skin glue became less reversible after subjected to RH-T cycles. Vinavil and Paraloid B72 were found to b the most c lour stable adhesiv s under UV ageing. The best overall performance was pres nted by Paraloid B72 and fish glu . © 2018 The Authors. Published by Els vier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/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: Wooden artefacts; adhesives; shear by compression loading; conserv tion 1. Introduction The selection of the appropriate adhesive is always an important issue in conservation of wooden artifacts of Cultural Heritage (CH). A poor adhesive can cause further and sometimes irreversible damage, both aesthetically and t t f ti f ti iti f t, l i l ti l tit t f t , . i , l , bstrac . , , , , l ac , . ir , . . . , . . . , . . . . t . li l i t . This is an open access article under th li tt :// ti . /li / / . / . r i responsibilit t i ti i itt e t st t ti l t i t eri t l i t i l of the appropriate adhesive is always an important issue in conservation of wooden artifacts of © 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.: +30 694 571 0616 E-mail address: elenitsetsekou@hotmail.com Received: May 08, 2018; Received in revised form: July 19, 2018; Accepted: July 24, 2018 i t . l.: il l it t t il.

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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.2018.09.032 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 . . 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