PSI - Issue 13

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 13 (2018) 131–136 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Application of singular integral equation to crack moving near an inclusion in two-dimensional infinite plate Masayuki Arai a , Kazuki Yoshida b * a Department of Mechanical Engineering, Tokyo University of Science, 6-3-1, Niijyuku, Katsushika-ku, Tokyo 125-8585, Japan b Graduate School of Mechanical Engineering, Tokyo University od Science, 6-3-1, Niijyuku, Katsushika-ku, Tokyo 125-8585, Japan This paper describes application of singular integral equation method to crack moving near an inclusion in two-dimensional infinite plate which is subjected to a tensile loading at infinity. The theoretical formulation is based upon the superposition of the problem of a continuous distribution of edge dislocations spread along the crack locus in an infinite plate with single inclusion and the problem for the same geometry without crack which is subjected to a tensile loading. The superposition leads to simultaneous singula in egral equation, and they relate the surface zero-tractions to the dislocation densities along the curved crack locus. The stress intensity factors are derived directly from the crack-tip stress field. Then, the crack tip is automatically moved to a direction as satisfying the restriction that the stress inte s ty factor K II is zero, which was developed in this study. The direction search is conducted by rotating the tip of virtually incremented cra k around the origin crack tip. The search and extension processes are rep ated in sequence. In this num rical calculation, the influence of the initial crack locations on crack moving path is discussed. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction In this study, the problem of a crack moving in an infinite elastic plate with a circular inclusion is addressed. When the crack tip approaches the inclusion, its t p could move toward the nc usion, which would result in an apparent increase in fracture resistance due to such a crack path deflection. This crack path deflection highlights an opportunity © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Application of singular integral equation to crack moving near an inclusion in two-dimensional infinite plate Masayuki Arai a , Kazuki Yoshida b * a Department of Mechanical Engineering, Tokyo University of Science, 6-3-1, Niijyuku, Katsushika-ku, Tokyo 125-8585, Japan b Gradu te Scho l of Mechanical Engineering, Tokyo University od Science, 6-3-1, Niijy ku, Katsushi a-ku, Tokyo 12 - 85, J pan Abstract This paper describes application of singular integral equation method to crack moving near an inclusion in two-dimensional infinite plate which is subjected to a te sile loading at infinity. The theoretical formulation is based upon the superp sition of the problem of a continuous distribution of edge dislocatio s spread along the crack locus i an infinite plate with single i clusion and the problem for the same geometry without cr ck which is subjected to a tensile loading. The superposition leads to simultaneous singular integral equation, and they relate the surface zero-tractions to th dislocatio densities along the curved crack locus. The tress intensity factors are derived dir ctly from the crack-tip stress field. Then, the crack tip is aut matically moved to a direction as satisfyi g the restriction that the stress intensity factor K II is zero, whic was developed in this study. The directi n sear h is conducted by rotating the tip of virtually incremented crack around the origin crack tip. The search and extension processes are repeated in sequence. In this numerical calculation, the influence of the initial crack locatio s on crack moving path is discus ed. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction In this study, the problem of a crack moving in an nfinite elastic plate with a circular inclusion is addressed. When the crack tip approaches the inclusion, its tip could move toward the inclusion, which wo ld result in an apparent increase in fractu resistanc due to such a crack path d flection. This cra k path deflection highlights a opportunity © 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. Abstract

* 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.: +81-3-5876-1823; fax: +81-3-5876-1823. E-mail address: marai@rs.tus.ac.jp * Corresponding author. Tel.: +81-3-5876-1823; fax: +81-3-5876-1823. E-mail ad ress: marai@rs tus.ac.jp

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.2018.12.022