PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 178 –1785 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 Methods for characterization of fresh and hardened state of fibre concrete René Čechmánek a, * , Vla an Prachař a , Martina Drdlová a , Martin Boháč a a Research Institute for Building Materials, Hněvkovského 30/65, Brno 61700, Czech Republic Abstract Design, preparation and testing of fibre-cement composites are a task of wide range of research workplaces and universities in our country and abroad. However, a question on homogeneity of all cement matrix components and mainly optimal dispersion of fibre reinforcement in a mixture has not been yet solved sufficiently. A research team from the Research Institute for Building Materials has designed new experimental devices for the Discovery Hybrid Rheometer to measure rheological properties of fresh cement-based mixtures. The aim of r search works was to find suitable h mogenization tech ques, design of mixing process and optimal dosing f individual components. By means of these actions it is possible to achieve the best dispersion of selected fibre types in fine-grained cementitious matrixes, which is subsequently verified in hardened composites at first by non-destructive and then by destructive methods. At the first stage non-destructive testing by means of ultrasound waves was carried out at first on a compact test slab with dimensions 500 × 500 × 40 mm and subsequently on individual test specimens with dimensions 250 × 40 × 40 mm, cut from the test slab according to a designed pattern. At the second stage destructive testing of test specimens was performed, mainly evaluation of flexural strength with 4-point bending and subsequently preparation of thin sections from the failure area for observation by means of polarizing microscopy to assess their structural integrity. The aim of research works was to find a method for monitoring homogeneity of cement composites reinforced with both metal and non-metal fibres before being subjected to mechanical loading. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fibre concrete; homogeneity; rheology; polarizing microscopy; destructive and non-destructive methods © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Methods for characterization of fresh and hardened state of fibre concrete René Čechmánek a, * , Vladan Prachař a , Martina Drdlová a , Martin Boháč a a Research Institute for Building Materials, Hněvkovského 30/65, Brno 61700, Czech Republic Abstract Design, preparation and testing of fibre-cement composites are a task of wide range of research workplaces and universities in our country and broad. How ver, a question on hom geneity of all cement matrix comp nents and mainly optimal dispersion of fibre reinforcement in mixture has not b en yet solved sufficiently. A research te m from the Research Institute for Buil ing Materials has designed n w experimental devices for the Discovery Hybrid Rheometer to measure rheological properties of fresh cement-based mixtur s. The aim of research works was to find suitable homogenization techniques, design f mixing roc s and optimal dosing of individual components. By means of these actions it is possibl t achieve t e b st ispersion of selected fibre types in fine-grained cementitious atrixes, which is subsequ ntly verified in hardened composites at fir t by non-destructive and th n by d structive methods. At the first stage non-destructive testing by means of ultrasound waves was carried out at first on a compact test slab with dimensions 500 × 500 × 40 mm and subsequently on individual test pecimens with dimensions 250 × 40 × 40 m , cut from the test slab acc rding to a designed pattern. At the second stage destructive t sting of test specimens was performed, ainly evaluation of flexural stre th with 4-point bendi g and subsequently preparation of thin sections from th failure area for observation by means f polarizing microscopy to assess their structural integrit . The aim f research works was to find a m thod f r monitoring homoge eity of ceme t composites reinforced with both metal and non-metal fibres before being subjected to ec anical loading. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fibre c ncrete; homogeneity; rheology; polarizing microscopy; destructive and non-destructive methods Fibre-cement composites have a long and abundant history of their use. Their role in the building industry has gradually progressed, but their use is not still ending even in the 21 st century. Fibre reinforcement is characterized by the follo ing propertie , as listed by Pytlík (2000): © 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. Fibre-cement composites have a long and abundant history of their use. Their role in the building industry has gradually progressed, but their use is not still ending even in the 21 st century. Fibre reinforcement is characterized by the following properties, as listed by Pytlík (2000): 1. Introduction 1. Introduction

* 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. * Corresponding author. Tel.: +420-602-445-343; fax: +420-543-216-029. E-mail address: cechmanek@vustah.cz * Corresponding author. Tel.: +420-602-445-343; fax: +420-543-216-029. E-mail ad ress: cechmanek@vustah.cz

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.2018.12.368