PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 9 8–913 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t 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 Elastic and plastic stress intensity factor in specimen of aluminum alloys under tension and bending in the temperature range N.V. Boychenko a, * a Kazan scientific Center of Russian Academy of Sciences, Lobachevsky str, 2/31,Kazan, Russia Abstract The elastic and plastic stress intensity factors (SIF) are studied through computations for two aluminum alloys in the temperature range. Subject for studies is central notched specimens with external semi-elliptical surface crack. Wide range of relative crack depth and aspect ratio is studied. The calculations are carried out under uniaxial tension and a three-point bending for aluminum alloys D16 and B95 at -60°С, 20°С and 250°С. The elastic and plastic stress intensity factor distributions along the curvilinear semi-elliptic crack front are obtained as a function of the relative sizes of defects, the loading type and temperature. Fundamental differe ces in the behavior of the el stic and plastic SIFs for surf ce cracks are established at high, room and low temperatures. The distributions of elastic SIF are th same at diff rent temperatures for both material . Contra y to that, the plastic SIF is sensitiv to the plas c pr p rties of the materials. The plastic SIF gradual y increas s by increasing the tem erature. The plastic SIF, which is sensitive to t e constraint effects and elastic-plastic material properties, is attractive as the self-dep ndent unified parameter for characterization of the material fracture resistance properties. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: plastic stress intensity factor, elastic stress intensity factor, surface flaw, uniaxial tension, three-point bend, low temperature, high tenperature © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Elastic and plastic stress intensity factor in specimen of aluminum alloys und tension and bending in the temperature range N.V. Boychenko a, * a Kazan scientific Center of Russian Academy of Sciences, Lobachevsky str, 2/31,Kazan, Russia Abstract The elastic and plastic stress intensity factors (SIF) are studied through computations for two aluminum alloys in the temperature range. Subject for studies is central notched specimens with external semi-elliptical surface crack. Wide range of relative crack depth and aspect ratio is studi d. The calculations are carried out under uniaxial tension nd a three-point bending for aluminum alloys D16 and B95 at -60°С, 20°С and 250°С. The el stic and plastic stress int sity f ctor distributions along the curvili ear semi-elliptic crack front are obtained as a function of the relative sizes of d fects, the loading type and temperature. Fundament l differ nces in the behavior of the lastic and plastic SIFs for surfac cracks are established at high, roo and low temperatures. The distributions of el stic SIF are the same at different tempera ures for both materials. Contr r to that, the plastic SIF is se sitive to the pl stic properties of th materials. The pl stic SIF gradu lly increas s by increasing the temper ture. The plastic SIF, which is sensitive to the constraint ffects and elastic-plastic material properties, is attra tive as the self-d pend nt unified parameter for characterization of the material fracture resistance properties. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: plastic stress intensity factor, elastic stress intensity factor, surface flaw, uniaxial tension, three-point bend, low temperature, high tenperature

© 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.: +78432363102; fax: +78432363102. E-mail address: nataboi@yandex.ru * Corresponding author. Tel.: +78432363102; fax: +78432363102. E-mail ad ress: nataboi@yandex.ru

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.2018.12.171