PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1165–117 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 Physical explanation of the critical distance theory and a link with structure of material Vedernikova A. a, *, Kostina A. a , Petrova A. b , Plekhov O. a a ICMMUrB RAS, Academika Koroleva st, 1, Perm 614013, Russia b IMP UB RAS, S. Kovalevskaya st, 18, Yekaterinburg 620137, Russia Abstract The Theory of Critical Distances (TCD) is a group of methods for prediction of materials failure with accounting effect of stress concentration. The work is devoted to the physical explanation of the critical distance theory, in particular the value of the critical length L, on the base of the original statistical-thermodynamic model of the evolution of defects proposed ICMM UB RAS. It has been shown that localization of the defect ensemble can be observed when existence of the area where stresses are higher than ultima e tensile strength and the spatial size of this area is equal to the half of the critical distance. Optical microscopy based structural analysis of fracture surfaces of specimen shows that annular area equal a critical distance value is characterized more smooth macro-reli f the macro- elief from the central area, which have rough structure with ridges and macr cracks. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Theory of Critical Distances, Model of the evolution of defects, Structural analysis; 1. Introduction The Theory of Critical Distances (TCD) is a group of design methods that is widely used in situation of practical interest to estimate the strength of components, which characterized by complex geometries and subjected to either static, dynamic or fatigue loading. Peterson (1959) and Novozhilov (1969) first proposed the central idea behind the TCD, based on suggestion that the effective stress can be directly calculated by simply using the stress at a distance © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Physical explanation of the critical distance theory and a link with str cture of material Vedernikova A. a, *, Kostina A. a , Petrova A. b , Plekhov O. a a ICMMUrB RAS, Academika Koroleva st, 1, Perm 614013, Russia b IMP UB RAS, S. Kov levskaya st, 18, Yekaterinburg 62 7, Russia Abstract The Theory of Critical Distances (TCD) is a group of methods for prediction of materials failure with accounting effect of stress concentration. The work is devoted to the physical explanation of the critical distance theory, in particular the value of the critical length L, on the base of the original statistical-thermodynamic model of the evolution of defects roposed ICMM UB RAS. It has been show t at localization of the defect ensemble ca be observed w en existence of th area where stresses are higher t n ultimate te sile strength and the spatial size of this area is equal to the half of the critical dist nce. Optical microscopy based structu al analysis of fracture surfaces of specimen shows that annular are equal a critical distance value is characterized more smooth macro-relief then macro-reli f from the c tral area, which have rough structure with ridges and macrocr cks. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Theory of Critical Distances, Model of the evolution of defects, Structural analysis; 1. Introduction The Theory of Critical Distances (TCD) is a group of design methods that is widely used in situation of practical interest to estimate the strength of components, which characterized by complex geometries and subjected to either static, dynamic or fatigue loading. Peterson (1959) and Novozhilov (1969) first proposed the central idea behind the TCD, based on suggestion that the effective stress can be directly calculated by simply using the stress at a distance © 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. E-mail address: terekhina.a@icmm.ru * Corresponding author. E-mail ad ress: terekhina.a@icmm.ru

* 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.2018.12.242