PSI - Issue 2_B

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 Struc ural Integrity 2 (2016) 2889–2895 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Mode I fracture toughness of fibre-reinforced concrete by means of a modified version of the two-pa amet r model Sabrina Vantadori*, Andrea Carpinteri, Giovanni Fortese, Camilla Ronchei, Daniela Scorza Dept. of Civil-Environmental Engineering and Architecture (DICATeA) – University of Parma Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract The present paper proposes a method to calculate Mode I plane-strain fracture toughness of concrete, by taking into account the possible crack deflection (kinked crack), even in the case of a far-field Mode I loading. As a matter of fact, during fracture extension, cracks may deflect as a result of microstructural inhomogeneities inside the material. Concrete is an inhomogeneous mixtu e due to aggregates e bedded in the cementiti us matrix, but additional inhomoge eities may be represen ed by fibres. Firstly, two-parameter fracture model based on Mode I analytical expres ions of the linear elastic fracture mechanics is employed. Then, in order to take into account the possible crack deflection as a result of the above inhomog neities, a modifi version of such a model is here discussed. Three-point bending tests on both plain concrete specimens and concrete specimens reinforced with micro-synthetic polypropylene fibrillated fibres are experimentally performed, and the modified model is applied. Keywords: Fibre-reinforced concrete; fracture toughness; micro-synthetic polypropylene fibrillated fibres reinforced concrete; two-parameter fracture model 1. Introduction The Two-Paramet r Model (TPM) originally proposed to determine the value of Mode I plane-strain fracture toughness of plain concrete (Jenq and Shah (1985), RILEM (1990), Karihaloo and Nallathambi (1991)) is herein modified in order to take into account the possible crack deflection (kinked crack). According to the TPM, the value of the fracture toughness is obtained from three-point bending tests on single edge-notched specimens. Firstly, the registration of the applied load against the crack mouth opening displacement 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Mode I fracture toughness of fibre-reinforced concrete by means of a modified ver ion of the two-parameter model Sabrina Vantadori*, Andrea Carpinteri, Giovanni Fortese, Cami l Ronchei, Dan ela Scorza Dept. of Civil-Environmental Engineering and Architecture (DICATeA) – University of Parma Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract The present paper proposes a method to calculate Mode I plane-strain fracture toughness of concrete, by taking into account the possible crack deflection (kinked crack), even in the case of a far-field Mode I loading. As a matter of fact, during fracture ext nsion, cracks may deflect as a result of microstructural inhomogeneities inside th material. Concrete is an i homoge eous mixtur due to aggregates emb ded in the cementitiou matrix, but a diti nal inhomo eneities y be represented by fibres. Firstly, a two-parameter fracture model based n Mode I analytical expres ions of the l near elastic fracture mechanics i employe . Then, in ord r to tak into account th possible crack deflection as result f the above inhomogeneities, a modifi d ve ion of such model i here discuss d. Three-point bendi g tests on both plain concr te specimens and oncrete specimen reinforc with micr -synthetic polypropyle e fibrillated fibres are xper mentally performed, and the modifi d model is applied. Keywords: Fibre-reinforced concrete; fracture toughness; micro-synthetic polypropylene fibrillated fibres reinforced concrete; two-parameter fracture model 1. Introduction The Two-Parameter Model (TPM) originally proposed to determine the value of Mode I plane-strain fracture toughness of plain concrete (Jenq and Shah (1985), RILEM (1990), Karihaloo and Nallathambi (1991)) is herein modified in order to take into account the possible crack deflection (kinked crack). According to the TPM, the value of t e fracture toughness is obtained from three-point bending tests on single edge-notched specimens. Firstly, the registration of the applied load against the crack mouth opening displacement Copyright © 2016 The Auth rs. Published by Elsevier B.V. This is an open access article u der the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +39 0521-905962; fax: +39 0521-905924. E-mail address: sabrina.vantadori@unipr.it * Corresponding author. Tel.: +39 0521-905962; fax: +39 0521-905924. E-mail address: sabrina.vantadori@unipr.it

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.361