PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1798–18 3 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Influence of the Interfacial Transition Zone on crack behavior in a matrix/aggregate system Lucie Malíková a,b *, Jan Klusák a a Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic b Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics, Veveří 331/95, 602 00 Brno, C zech Republic Abstract Fra ture behavior of a crack in a matrix/aggregate (MTX/AGG) system is studied. Influence of the Interfacial Transition Zone (ITZ) between the individual phases on the fracture response is investigated. It is discussed how the crack propagation process depends on properties of matrix and aggregate but especially the influence of the ITZ (that arises between the individual layers) is investigated. Various combinations of materials of matrix, aggregate and ITZ affect the fracture behavior of the whole system. Numeric l simulations of a crack terminating at the MTX/ITZ interface based on the finite element method are presented to analyze the critical loading and discuss the effects of several parameters (ITZ thickness, AGG radius, MTX/ITZ elastic mismatch) on the crack propagation ne r a bi- at rial inte face. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organizers. Keywords: Matrix/aggregate system; interfacial transition zone; finite element method; three-point bending test; generalized fracture mechanics; bi-material interface Cement-based composites are probably the most broadly used materials in civil engineering applications, see Nevile (2011), but their fracture behavior has not been described reliably. Although the individual components of such a compo ite mat rial exhibit very often brittle behavior, the b havior f the cement based composite, as a matrix/aggregate system, is non-linear, particularly quasi-brittle and it is typical through the load-displacement ECF22 - Loading and Environmental effects on Structural Integrity Influence of the Interfacial Transition Zone on crack behavior in a matrix/aggregate system Lucie Malíková a,b *, Jan Klusák a a Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic b Brno University of Technol gy, Faculty of Civil Engin ering, Institute of Structural Mechanics, Veveří 331/95, 602 00 Brno, C zech Republic Abstract Fracture behavior of a crack in a matrix/aggregate (MTX/AGG) system is studied. Influence of the Interfacial Transition Zone (ITZ) between the individual ph ses on the fracture response is investigated. It is discussed h w the crack propagation process depends on properties of matrix and aggregate but esp cially the influence of the ITZ (that arises between the individual layers) i investigated. Various co binatio s of materials of matrix, aggregate and ITZ affect t e fracture behavior of the whole system. Numerical simulations f a crack terminating at the MTX/ITZ int rf ce based on the finite element m thod are presented to analyze the cri i al loading a d discuss th effects of several parameters (ITZ thickness, AGG radius, MTX/ITZ elastic mismatch) on th crack propagatio near a bi-material interface. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Matrix/aggregate system; interfacial transition zone; finite element method; three-point bending test; generalized fracture mechanics; bi-material inte face 1. Introduction Cement-based compos tes are probably the most broadly used materials in civil engineering applications, see Nevile (2011), but their fracture behavior has not been described reliably. Although the individual components of such a composite material exhibit very often brittle behavior, the behavior of the cement based composite, as a matrix/aggregate system, is non-linear, particularly quasi-brittle and it is typical through the load-displacement © 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. 1. Introduction

* Corresponding author. Tel.: +420541147381. E-mail address: malikova.l@fce.vutbr.cz * Corresponding author. Tel.: +420541147381. E-mail ad ress: malikova.l@fce.vutbr.cz

* 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 organizers.

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.2018.12.357