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 Structural Integrity 13 (2018) 1731–1738 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 Comparison of tensile behaviour of polypropylene, aramid and carbon fibre reinforced cementitious composite at high strain rate loading Martina Drdlová a, * , René Čechmánek a a Research Institute for Building Materials, Hnevkovskeho 65, Brno, 61700, Czech Republic This paper presents an experimental study on uniaxial mechanical properties of polypropylene, aramid and carbon micro fibre reinforced high perform e cementitious composite subjected to both static and high strain r te tensile load ng. This cementitious composite is intended to be used as a matrix for slurry infiltrated fibre concrete, which is being developed to be used for elements and structures for blast, ballistic and other impact protection. Cylindrical specimens of 30 mm diameter and 15 mm thickness were subjected to the indirect tensile (Brazilian) test at loading rate about 5.10 5 GPa.s -1 (quasi-static load regime) and 2.10 3 GPa.s -1 (high strain rate load regime). Specimens were tested using servo hydraulic press machine and 15 mm diameter Split Hopkinson pressure bar. Dynamic strength increase factor and fibre reinforcement factor have been studied versus both strain-rate and fibre type. Indirect tensile strength and post peak behaviour vary for specimens with different micro-fibre reinforce ent, which allows to find the optimal reinforcement for high strain r te impacted concrete structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywo ds: Cementitious composite; fibre; c ncrete; SHPB; Split H pkinson Pressure Bar; Br zilian test; indirect tensile strength, high strain rate 1. Introduction Infrastructures might experience high strain rate loads such as car crash impact, earthquake or blast, with potentially catastrophic consequences. Cementitious composites are brittle and the brittleness increases with strength, as reported © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Comparison of tensile behaviour of polypropylene, aramid and carbon fibre reinforced cementitious composite at high strain rate loading Martina Drdlová a, * , René Čechmánek a a Research Institute for Building Materials, Hnevkovskeho 65, Brno, 61700, Czech Republic Abstract This paper presents an experimental study on uniaxial mechanical properties of polypropylene, aramid and carbon micro fibre reinforced high performance cementitious composite subjected to both static and high strain rate tensile loading. This cementitious composite is intended to be used as a matrix for slurry infiltrated fibre concrete, which is being developed to be used for elements and structures for blast, ballistic and other impact protection. Cylindrical specime s of 30 mm diameter and 15 m thick ess were subjected to the indirect tensile (Brazilian) test at loading rate about 5.10 5 GPa.s -1 (quasi-static load regime) and 2.10 3 GPa.s -1 (high strain rate load regime). Specimens were tested using servo hydraulic press machine and 15 mm diameter Split Hopkinson pressure bar. Dynamic strength increase factor and fibre reinforcement factor have been studied versus both strai -rate and fibre type. Indirect tensile strength and post peak behaviour vary for s ecim ns with ifferent micr -fibre reinforcement, which allows to find the optimal reinforc ment for high s rain rate impa ted concrete structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: Cementitious composite; fibre; concret ; SHPB; Split H pkinson Pressure Bar; Brazilian test; indirect tensile strength, high strain rate 1. Introduction Infrastructures might experience high strain rate loads such as car crash impact, earthquake or blast, with potentially catastrophic consequences. Cementitious composites are brittle and the brittleness increases with strength, as reported © 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 organizers. * Corresponding author. Tel.: +420-608-620-953; fax: +420-543-216-029 E-mail address: drdlova@vustah.cz * Corresponding author. Tel.: +420-608-620-953; fax: +420-543-216-029 E-mail ad ress: drdlova@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.2018.12.364