PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 2143–2151 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. ECF22 - Loading and Environmental effects on Structural Integrity The development and application of the new methodology for conveyor idlers fits testing Zarko Miskovic a *, Radivoje Mitrovic a , Zoran Stamenic a , Gordana M. Bakic a , Milos B. Djukic a , Bratislav Rajicic a University of Belgrade – Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia The proper interference fit between the joined parts is a prerequisite for an effective pressure joint. The main purpose of the pressure joint is to transfer tangential, radial nd axial loads between the joined parts. In order to provide proper functioning of the machine assembly (whose component parts are connected by the pressure joints), i.e. the transfer of loads without skidding, it is essential to determine the pressure joints interference fit parameters. The new methodology for the conveyor idlers pressure joints quality control is presented in this paper. The procedure for the analytical determination of the expected disassembling force (limiting value) in the pressure joints between the shaft – rolling bearing and the bearing – idler shell is described in detail. The analytically calculated boundary values are compared with the experimental ones. According to the presented criteria, the evaluation of the conveyor idler fits quality was performed and reliable conclusions were successfully adopted. © 2018 The Authors.Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: conveyor idlers; experimental testing; testing met odology; interfere ce fits; 1. Introduction Pressure joints (interference fit joints) are achieved through cylindrical contact surfaces of the joined parts. They provide reliable transfer of circumferential, axial and radial loads. The diameter tolerances of contact cylinders are manufactured in the way that generates interference (firm) fit after the assembling (Nieman 1975) . They are manufactured in one of the following ways: longitudinal pressing (with a hydraulic or a mechanical press) or transversal pressing (by cooling of the inner and/or heating of the outer part) (Marghitu 2001, Carvill 1993) . © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The development and application of the new methodology for conveyor idlers fits testing Zarko Miskovic a *, Radivoje Mitrovic a , Zoran Stamenic a , Gordana M. Bakic a , Milos B. Djukic a , Bratislav Rajicic a University of Belgrade – Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia Abstract The proper interfe ence fit between the jo d parts i a prerequ site for an effective pr ssure joint. The main purpose of the pres ure joint is to transfer ta g ntial, radial and axial lo d betwe n the j ined parts. In orde to p ovide proper fu ctioning f t machin assembly (whos component parts are connected by the pressure joints), i.e. the t ansfer of loads without skidding, it is essential to det rmine the pressure joi ts interference fit paramet rs. The new methodology for the c nveyor idlers pressure joint qu lity cont ol is pr sented in this paper. Th procedure for the analytical determination f t expected disas embling force (limiting value) in the pressure joints between the shaft – rolling b aring and the beari g – idler s ll is described in detail. The analytically c lculated boundary value are compared with the experiment l ones. According to the presented criteria, the evalu tion of the onveyor idler fits quality w s performed and reliable conclusions w re su cessfully adopted. © 2018 The Authors.Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organiz rs. Keywords: c nveyor idlers; experimental testing; testing methodology; int rfere ce fits; 1. Introduction Pressure joints (interference fit joints) are achieved through cylindrical contact surfaces of the joined parts. They provide reliable transfer of circumferenti l, axial and radial loads. The diame er toler nces of contact cylinders are manufactured in the way that generates interference (firm) fit aft r the assembling (Nieman 1975) . Th y t i on of the following ways: longitudinal pressing (wit a hydraulic or a echanical pr ss) or transversal pressing (by cooling of the inner and/ r heati g of the outer part) (Marghitu 2001, Carvill 1993) . © 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. Abstract

* Corresponding author. Zarko Miskovic, E-mail address: zmiskovic@mas.bg.ac.rs * Corresponding author. Zarko Miskovic, E-mail address: zmiskovic@mas.bg.ac.rs

* 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 o ganizers.

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.2018.12.150