PSI - Issue 3

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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 © 2017 The Authors. Publish d by Elsevier B.V. This is an open a ces article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy On field durability tests of mechanical systems. The use of the Fatigue Damage Spectrum F. Cianetti a *, A. Alvino b , A. Bolognini b , M. Palmieri a , C. Braccesi a a University of Perugia, Industrial Engineering Department, Via G. Duranti 67, 06125 Perugia, Italy b SERMS s.r.l., Strada di Pentina 48, 05100 Terni, Italy Abstract In the present paper the authors, starting from a previously proposed method for the combination and the synthesis of equivalent load conditions (by only managing PSD representations of the load conditions), developed a new approach based on the concept of Fatigue Damage Spectrum and on the system dynamics. The proposed approach was then validated by a durability test case, in which two different acceleration motion based load conditions, a norm load condition (by using laboratory test) and an operative one (by using acceleration measurements acquired during an experimental activity conducted on a transport vehicle) were compared. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: Random loads, Accelerated tests, Fatigue Damage Spectrum, Vibration Fatigue 1. Introduction In previous activities, conducted by the authors, the evaluation of damage generated by random loads ( i.e. wind loads [Gong et al. (2914)], rail contact [Wolfsteiner (2013)], spindle forces [Decker et a. (2002)], proving grounds [Karlsson (2007)]) in generic mechanical system was analyzed by using and modifying consolidated approaches [Braccesi et al. (2010)] like the Ashmore one [Ashmore et al. (1992)]. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy On field durability tests of mechanical systems. The use of the Fatigue Damage Spectrum F. Cianetti a *, A. Alvino b , A. Bolognini b , M. Palmieri a , C. Braccesi a a University of Perugia, Industrial Engineering Department, Via G. Duranti 67, 06125 Perugia, Italy b SERMS s.r.l., Strada di P ntina 48, 05100 Terni, I aly Abstract In the present paper the authors, starting from a previously proposed method for the combination and the synthesis of equivalent load conditions (by only managing PSD representations of the load conditions), devel ped a new pproach bas d on the conc p of Fatigue Damage Spectrum nd on the syst m dynamics. The proposed pproach was then validated by a durability test case, in which two different acceleration motion based load conditi ns, a norm load condi io (by using laboratory test) and an operative one (by us ng acceleration measurements acquire during a experi ent l a tivity conducted on transport vehicle) were compared. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of IGF Ex-Co. Keywords: Random loads, Accelerated tests, Fatigue Damage Spectrum, Vibration Fatigue 1. Introduction In previous activities, conducted by the authors, the evaluation of damage generated by random loads ( i.e. wind loads [Gong et al. (2914)], rail ontact [Wolfsteiner (2013)], spi dle forces [D cker t a. (2002)], pr ving grounds [Karlsson (2007)]) in generic mech nical syst m was analyzed by using and modifying consolidated approache Braccesi et al. (2010)] lik the Ashmore one [Ashmore et al. (1992)]. © 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 © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibil ty of the Scientific Committee of IGF Ex-Co. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of IGF Ex-Co. * Corresponding author. Tel.: +39 075 5853728; fax: +39 075 5853703. E-mail address: filippo.cianetti@unipg.it * Corresponding author. Tel.: +39 075 5853728; fax: +39 075 5853703. E-mail ad ress: filippo.cianetti@unipg.it

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. 10.1016/j.prostr.2017.04.034