PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1409–1416 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com S Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Calculations of fatigue life of a welded joint in the construction of the trolleybus rear axle Miloslav Kepka a *, Miloslav Kepka Jr. a a Regional Technological Institute, research center of the Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 2732/8, 30614 Pilsen, Czech Republic Abstract In trolleybuses in service, fatigue cracks were frequently encountered in a welded structural detail in their rear axle housing. Sufficiently representative stress-time histories for the critical cross section through this part were obtained by measurement during rides with empty as well as fully-loaded vehicles. The fatigue characteristics of the critical location had to be established by estimation. This information was used as the basis for parametric calculations of fatigue life. The main purpose of these calculations was to ascertain whether these in-service failures could have been predicted (and prevented) during the design stage, and what their main cause had been. Furthermore, this investigation explored t feasibil ty of verifying this structural detail’s service life using the f t gue lif distribution fu cti . © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: design and structural assessment; welded joint; fatigue failure; service load; computational prediction of service fatigue life; nCode 1. Introduction For decades, the Research and Testing Institute Plzen has been developing and practising an up-to-date methodology for designing, sizing and testing structures for Škoda buses and trolleybuses. The methodology comprised the following steps: multibody simulations, FEM calculations, vehicle and component testing in electrohydraulic testing stands, in-service load measurement on vehicles running on test loops as well as on real-world 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal alculations of fatigue life of a elded joint in the constructi n of the trolleybus rear axle iloslav Kepka a *, iloslav Kepka Jr. a a Regional Technological Institute, research center of the Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 2732/8, 30614 Pilsen, Czech Republic Abstract In trolleybuses in service, fatigue cracks were frequently encountered in a welded structural detail in their rear axle housing. Sufficiently representative stress-time histories f the critical cross section through this part were obtained by measurement during rides with empty as well as fully-loaded vehicles. The fatigue characteristics of the critical location had to be established by estimation. This information was used as the basis for parametric calculations of fatigue life. The main purpose of these calculations was to ascertain whether these in-service failures could have been predicted (and prevented) during the design stage, and what their main cause had been. Furthermore, this investigation explored the feasibility of verifying this structural detail’s service life using the fatigue life distribution function. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: design and structural assessment; welded joint; fatigue failure; service load; computational prediction of service fatigue life; nCode 1. Introduction For decades, the Research and T sting Institute Plzen has been developing and practising an up-to-date methodology for designing, sizing and testing structures for Škoda buses and trolleybuses. The methodology comprised the following steps: multibody simulations, FEM calculations, vehicle and component testing in electrohydraulic testing stands, in-service load measurement on vehicles running on test loops as well as on real-world © 2017 The Auth rs. Published by Els vier B.V. Peer-revi w und r responsibility of the Scientific Commi tee of ICSI 2017 © 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.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.205 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Corresponding author. Tel.: +420-604-831-035; fax: +420-377-638-202 E-mail address: kepkam@rti.zcu.cz * Corresponding author. Tel.: +420-604-831-035; fax: +420-377-638-202 E-mail address: kepkam@rti.zcu.cz