PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 542–547 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 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. ECF22 - Loading and Environmental effects on Structural Integrity Contribution of date-palm fibres reinforcement to mortar fracture toughness Andrea Zanichelli*, Andrea Carpinteri, Giovanni Fortese, Camilla Ronchei, Daniela Scorza, Sabrina Vantadori Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy The present paper aims to analyse the fractu e behaviour of date-palm fibre-r inforc mortar. The egetable fibres have been valorized over the last few years as a suitable reinforcement of cement-based matrixes used in non-structural applications. As a matter of fact, the desirable characteristics of such fibres (for instance, low environmental impact, biodegradability, low cost and density, and equitable stiffness and toughness) have led many designers to employ vegetable fibres in building composite materials. To the best knowledge of the authors, there are no studies in the literature related to the fracture behaviour of a cement based mortar reinforced by a date-palm fibre mesh. In the present paper, the fracture behavior of a cement mortar reinforced by short fibres extracted from date-palm mesh is analysed. An experimental campaign is carried out on single edge-notched specimens, by examining five different values of fibre content. The experimental tests are performed under three-point bending loading and crack mouth opening displacement control. The Modified Two-Parameter Model proposed by the authors is herein adopted in order to compute the fracture toughness. Such a method is able to take into account the possible crack kinking occurring during the stable crack propagation, which is typical of quasi-brittle materials. © 2018 The Authors. Published by Elsevi r B.V. Peer-review und r responsibil ty of the ECF22 organizers. Keywords: date-palm fibre ; fibre-reinforced mortar ; fracture behaviour ; modified two-parameter model ; performance index . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Contribution of date-palm fibres reinforcement to mortar fracture toughness Andrea Zanichelli*, Andrea Carpinteri, Giovanni Fortese, Camilla Ronchei, Daniela Scorza, Sabrina Vantadori Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract The present paper aims to analyse the fracture behaviour of date-palm fibre-reinforced mortar. The vegetable fibres have been valoriz d over the last few years as a suitable reinforcement of ceme t-bas d matrixes used in non-structural applications. As a matter of fact, t de irable characteri tics of such fibr s (for instance, low nvironm ntal impact, biodegradability, low cost and density, and equitable stiffness and toughne s) have led ma y designers to employ veget ble fibr s in uilding composite materials. To the best knowledge of the authors, there are no studies in th literature related to the fracture behaviour of a cement bas d mortar reinforced by a ate-palm fibre mesh. In the present paper, th fractur behavior of a em nt mortar reinforced by short fibres extracted from t - l mesh is analysed. An experimental campaign is carried out on single edge-notched specimens, by examining five different values of fibre content. The exp rimental tests are performed under thre -point bending loading and crack mouth opening displacement control. The Modified Two-Parameter Model proposed by the authors is herein adopted in order to comput the fractur toughness. Suc a metho is able to take int account the possible crack kinking occurring during the stable crack propagatio , w ic is typical of quasi-brittle materials. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: date-palm ibre ; fibre-reinf rced mortar ; fractur ehaviour ; modified tw -parameter model ; performance index . Abstract

© 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers. * Corresponding author. Tel.: +39-0521-905923; fax: +39-0521-905924. E-mail address: andrea.zanichelli1@studenti.unipr.it * Corresponding author. Tel.: +39-0521-905923; fax: +39-0521-905924. E-mail ad ress: andrea.zanichelli1@studenti.unipr.it

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 B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.089