PSI - Issue 8

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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. Copyright © 2018 The Authors. ublished by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Development of a simplified model for the vibration analysis of lawn mowers L. Bertini a , F. Bucchi a , B. D. Monelli a and P. Neri a, * a University of Pisa, Department of Civil and Industrial Engineering, Largo L. Lazzarino 1, Pisa 56122, Italy Abstract The vibrational behavior of vehicles is a crucial issue for the comfort, especially for the professional vehicles. This paper presents a simplified modelling approach for studying the vibrational behavior of a lawn tractor. The vibrational response of a real vehicle is analyzed by an extensive experimental modal analysis and Finite Element model (FE) simulating the modal behavior of the whole tractor. The FEM was then validated by the comparison with the experimental results and then used for identifying the components and connections effectively driving the modal response. Based on these results, a simplified Multi-Body (MB) model, able to reproduce the vibrational response of the studied lawn mower, was then setup, showing good correspondences with experimental results. General guidelines for defining effectiv vehicles Multi-Body modal models were also derived. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Experimental modal analysis; Finite Element modal model; Multi-Body modal model; lawn mower. 1. Introduction The vibration behavior of vehicles is important for comfort analysis, especially if the vehicle is intended for long term human operation, such as professional lawn trac ors. Unfortunately, experimental analyses are time consuming, expensive and usually provide a partial description of the vehicle behavior. Moreover, the correction of vibration AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Development of a simplified model for the vibration analysis of lawn mowers L. Bertini a , F. Bucchi a , B. D. Monelli a and P. Neri a, * a University of Pisa, Department of Civil and Industrial Engineering, Largo L. Lazzarino 1, Pisa 56122, Italy Abstract The vibrational b havior of vehicles is a crucial issue for the comfort, especially for he professional vehicles. This p p r pr sents a simplifie modelling approach for studying the vibration l behavior of a lawn tractor. The vibrational r sp nse of a real vehicl is analyzed by an extensive exp riment l modal analysis nd Finite Element model (FE) simulating the modal behavior of whole t or. The FEM was th n a idated by the c mpari on with th experim ntal results and then used f r identifying the comp nents and connect ons effectively driving t mo al respo se. Based on these results, a simplified Multi-Body (MB) model, able to reproduce the vib ti nal response of the studied lawn mower, was then setup, showing good cor esponden es w th experimental r sults. General g idelines for defining effective vehicles Multi-Body modal models wer also derived. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Experimental modal analysis; Finite Element modal model; Multi-Body modal model; lawn mower. 1. Introduction The vibration behavior of vehicl s is important for comfort analysis, especially if the vehicle is intended for lo - term human operation, such as professional lawn tractors. Unfortunately, experimental analyses are time consuming, expensive and usually provide a partial description of t e vehicle behavior. Moreover, the correction of vibration © 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.: +39-050-2218019; fax: +39-050-2218065. E-mail address: paolo.neri@dici.unipi.it * Correspon ing author. T l.: +39-050-2218019; fax: +39-050-2218065. E-mail address: paolo.neri@dici.unipi.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* 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  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.050