PSI - Issue 7

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 Structu al Integrity 7 (2017) 262–267 ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 Available onlin at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000

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www.elsevier.com/locate/procedia 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Possibility of fatigue damage detection by non-destructive measurement of the surface hardness Šulko Miroslav a , Chmelko Vladimír b *, Miloslav Kepka b a Slovak University of Technology, Faculty of Mechanical Engineering, Institute of applied mechanics and mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic b Facu lty of Mechanical Engineering, Regional Technological Institute, University of West Bohemia, Univerzitní 22, 306 14 Plzeň , Czech republic Abstract The cyclic material properties of metals are reflection of their internal structure and chemical composition. The fatigue process inside material is the consequence of the cyclic plastic deformation localized in the points of stress concentration. The sleep processes inside material induced by cyclic loading gradually lead to creating slip curves, slip bands and then generating and spreading of microcracks. Those processes change the state and also properties at the surface of material. This fact led to the idea of fatigue damage level detection by measuring the hardness at the surface layers. The presented contribution will present results of surface hardness measurements of material specimens during cyclic loading. There will be also introduced the methodology of surface hardness measurement by Brinell´s method and hardness measurements of constitutive phases by Vickers method on steel specimens cyclically loaded. The results will be presented graphically in the form of dependency between that surface hardness respectively constitutive phases and the number of cycles to fracture. Measurements were made for several levels of loading stress amplitude and for two kinds of steel material. Obtained experimental results are analyzed and discussed in relation of other experimental measurement in detail. 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 S ptember 2017, Lec o, Italy Possibility of fatigue damage detection by non-destructive measurement of the surface hardness Šulko Miroslav a , Chmelko Vladimír b *, Miloslav Kepka b a Slovak University of Technology, Faculty of Mechanical Engineering, Institute of applied mechanics and mechatronics, Námestie slobody 17, 812 31 Bratislava, Slovak republic b Facu lty of Mechanical Engineering, Regional Technological Institute, University of West Bohemia, Univerzitní 22, 306 14 Plzeň , Czech republic Abstract Th cyclic material properties of metal are reflection of their internal structure and chemical composition. The fatigue process inside material is the cons que ce of the cyclic plastic deformation lo alized in t oints of stress concentration. The sleep processes insi e material induced by cyclic loading gra ally lead to creating slip curves, slip bands and t en g neratin and p e ding of microcr cks. Those processes change the state and al o properties a the surface of material. This fact led to e idea of fatigue damage level detection by m asuring the hardnes at the surface layers. The p esente contribution will present results of surface hardness measurements of material sp cimens during yclic lo ding. There will b al o introduc d the methodology surface hardness measurement by Bri ell´s method and hardness measurements of con titutive phases by Vi kers method steel specim ns cyclically loaded. The results will be presented graphically in the form of dependency between that surface hardness respectively constitutive phases and the number of cycles to fracture. Measurements were made for several levels of loading stress amplitude and for two kinds of steel material. Obtained experimental results are analyzed and discussed in relation of other experimental measur ment in detail. 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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd I ternational Symposium on Fatigue Design and Material Defects. © 2017 The Authors. Published by Elsevier B.V. P er-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Type your keywords here, separated by semicolons ;

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Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +421 57296225. E-mail address: vladimir.chmelko@stuba.sk

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. * Corresponding author. Tel.: +421 57296225. E-mail address: vladimir.chmelko@stuba.sk

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.087