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) 17 2–17 7 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 Advanced Model of Chloride Penetration Considering Concrete Heterogeneity Tuan Duc Le a,b , Petr Lehner b , Petr Konečný b * a Saigon Technology University, Faculty of Civil Engineering, 180 Cao Lo Str., Ward 4, Dist. 8, HCMC 700000, Vietnam b VSB- Technical University of Ostrava, Faculty of Civil Engineering, Department of Structural Mechanics, Ludvíka Podéště 1875/17, 7 08 33 Ostrava-Poruba, Czech Republic Abstract This paper is aimed at 2D chloride ingress modelling of reinforced concrete structures with respect to concrete heterogeneity. The spatial variation of concrete ability to resist the ingress of chloride along the studied area may allow for a more realistic description of concrete aggregate and matrix effect. Time dependent chloride concentration at reinforcement level in both homogeneous and heterogeneous models was comparatively considered. Combination of random fields and 2 nd Ficks Law based diffusion model through finite element method seems to be a promising approach and this mergence was preliminarily evaluated. © 2018 The Authors. Published by Elsevier B.V. Pe r-review under res on ibili y of the ECF22 organizers. Keywords: Chloride penetration; concrete heterogeneity; r ndom fields; 2 diffusion model; correlation length; spatial variati n. 1. Introduction Durability of reinforced concrete (RC) structures during their service lifetime is reduced due to long term effects of harsh environment such as chloride exposure. Besides the laboratory experiments it is also important, therefore, to model chloride penetration into RC tructures to properly evaluate the performance of these structures over the time. Durability of concrete exposed to aggressive agents has been a topic studied by many researchers for ages (Hooton et al., 2001; Konečný et al., 2011; Marsavina et al., 2009; Szweda and Zybura, 2013; Vořechovská et al., 2009) . ECF22 - Loading and Environmental effects on Structural Integrity Advanced Model of Chloride Penetration Considering Conc te Heterogeneity Tuan Duc Le a,b , Petr Lehner b , Petr Konečný b * a Saigon Technology University, Faculty of Civil Engineering, 180 Cao Lo Str., Ward 4, Dist. 8, HCMC 700000, Vietnam b VSB- Technical University of Ostrava, Faculty of Civil Engi eering, Department of tructural Mechanics, Ludvíka Podéště 1875/17, 7 08 33 Ostrava-Poruba, Czech Republic Abstract This paper is aimed at 2D chloride ingress modelling of reinforced concrete structures with respect to concrete heterogeneity. The spatial variation of concrete ability to resist the ingress of chloride al g the studied area may allow f r a more realistic description of concrete aggregate and matrix effect. Time dependent chloride c centration at reinforcement level in both homogeneous and heterogeneous models was comparatively considere . Combination of random fields and 2 nd Ficks Law based diffusion model through finite element method seems to be a promising approach and this mergenc was preliminarily evaluated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Chloride penetration; concrete heterogeneity; random fields; 2D diffusion model; correlation length; spatial variation. 1. Introduction Durability of reinforced concrete (RC) structures during their se vice lifetime is reduced due to long term effects of harsh e vironment such as chlo i e exposure. Besides the laboratory experi ents it is also important, therefore, to model chloride penetration into RC structures to properly evaluate the performance of these structures over the time. Durability of concrete exposed to aggressive agents has been a topic studied by many researchers for ages (Hooton et al., 2001; Konečný et al., 2011; Marsavina et al., 2009; Szweda and Zybura, 2013; Vořechovská et al., 2009) . © 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.: +0-000-000-0000 ; E-mail address: petr.konecny@vsb.cz * Corresponding author. Tel.: +0-000-000-0000 ; E-mail ad ress: petr.kon cny@vsb.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.2018.12.354