PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1947–1954 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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 u der r sponsibility of th ECF22 rganizers. ECF22 - Loading and Environmental Effects on Structural Integrity Experimental measurement of structural steel corrosion Jaroslav Odrobiňák a , Jozef Gocál a, * a University of Žilina, Faculty of Civil Engineering, Univerzitná 1, 01026 Žilina, Slovensko Abstract Corrosion is recognized as the most significant degradation effect of the structural steel. This degradation process is affecting the cross-sectional and structural element resistance and deformation parameters of structure. To estimate the speed of corrosion loss in the case of steel plates, rapid test in corrosion chamber were done. Such measurements have their significance, however for their evaluation and confrontation with the results mea ured in situ much more data from corrosion processes observed in actual environment are still needed. Therefore, the paper also presents the results of first round of experimental measurement of corrosion losses carried out on specimens of structural steel placed on several bridge structures built in different places. Effects of local microclimate factors on corrosion process resulting from the type of bridge structures or their individual elements is pointed. To underline justification of experimental program, the influence of corrosion on flexural load-carrying capacity of three chosen structural elements from bridges in service is presented, as well. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Corrosion; structural steel; experimental measurement; corrosion losses; rapid test. 1. Introduction In the area of steel bridges, the corrosion of structural steel represents one of the most significant degradation impacts on their reliability and durability. Because of considerable costs for maintenance and reconstruction of infrastructure objects, good protection of steel structures based on information about an aggressiveness of environment should be applied. Moreover, corrosion losses have direct impact on the load-carrying capacity of structural elements and consequently on overall safety of bridge structure. ECF22 - Loading and Environmental Effects on Structural Integrity Experimental measurement of structural steel corrosion Jaroslav Odrobiňák a , Jozef Gocál a, * a University of Žilina, Faculty of Civil Engineering, Univerzitná 1, 01026 Žilina, Slovensko Abstract Corrosion is recognized as the most significant degradation effect of the structural steel. This degradation process is affecting the cr ss-sectional and structural element resistance and eformation parameters of structure. To estimate the speed of corrosion loss in the case of steel plates, rapid test in corrosion chamb r were done. Such measurements have their significance, however f r their evaluation and confrontation with the results measured in situ much more data from corrosion processes observed in actual environment are still needed. T erefor , the paper al o presents the results of first round of experimental measurem nt of corro ion losses carried out on specimens of structural steel placed on several bridge struct res built in different places. Effects of local microclimate factors on corrosion process resulting from the type of bridge structures or their individual elements is pointed. To underline justification of experimental program, the influence of corrosion on flexural load-carrying capacity of three chosen structural elements from bridges in service is presented, as well. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Corrosion; structural steel; experimental measurement; corrosion losses; rapid test. 1. Introduction In the area of steel bridges, the corrosion of structural steel represents one of the most significant degradation impacts on their reliability and durability. Because of considerable costs for maintenance and reconstruction of infrastructure objects, good protection of steel structures based on information about an aggressiveness of environment should be applied. Moreover, corrosion losses have direct impact on the load-carrying capacity of structural elements and consequently on overall safety of bridge structure. © 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.: +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.: +421-41-513-5664; fax: +421-41-513-5690. E-mail address: jaroslav.odrobinak@fstav.uniza.sk * Corresponding author. Tel.: +421-41-513-5664; fax: +421-41-513-5690. E-mail ad ress: jar slav.odrobinak@fstav.uniza.sk

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.2018.12.266