PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 208–215 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect 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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) An analysis of the dynamics of seismically isolated structures taking into account its torsional vibrations Yu. L. Rutman a , E. Simbort b , D. E. Bondarev a* a Saint-Petersburg State University of Architecture and Civil Engineering (SPSUACE) 2-nd Krasnoarmeiskaya St. 4, 190005 St. Petersburg, Russia b Universidad Catolica San Pablo, s/n Urb. Campiña Paisajista, Quinta Vivanco, Arequipa (054), Peru Abstract In this paper are researched torsional fluctuations of structure located on the pendulum system of seismic isolation (SIS). Torsional oscillations are caused by the incongruence of the center of rigidity (CR) with the center of mass (CM) of the structure and influence of rotational ground motions. In the calculations given below is considered only the first reason. The lack of coincidence of CR and CM leads to an asynchronous motion of different pendulum devices and to their different longitudinal deformation. Thereby, the tension and compression forces of the devices are different. This leads to the torsion, rocking and vertical displacement of the seismically isolated structure. This p pe investigates the influence of the above-mention d effects. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: pendulum system of seismic isolation; mathematical model; torsional oscillations. 1. Introduction The analysis of eismic isolation systems (SIS) is generally performed under kinematic excitations defined by horizontal ground motions. The influence of vertical and rotational components of earthquake excitation on the XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) An analysis of the dynamics of seismically isolated structures taking into account its torsional vibrations Yu. L. Rutman a , E. Simbort b , D. E. Bondarev a* a Saint-Petersburg St te Univ r ity of Architecture and Civil En ineering (SPSUACE) 2-nd Kr sn armeiskaya St. 4, 190005 St. Petersburg, Russia b Universidad Catolica San Pablo, s/n Urb. Campiña Paisajista, Quinta Vivanco, Arequipa (054), Peru Abstract In this paper are res arched torsi al fluctuations of structure located on the pendulum system of seismic isolation (SIS). Torsio al scill ti s are caused by the incongruence of the center of rigidity (CR) with the cent r of mas (CM) of the stru ture and influence of rotation l gr und motions. In the calculations given below is considered only the first reason. The lack of coinc dence of CR and CM leads to an asynchron us motion of different pendulum devices and o their different longitudinal deformation. Thereby, the tension and compression f rces of the devices are different. This leads to the rsion, rocking and vert cal displ cement of he seismi al y isolated structure. This paper investigates the influence of the above-men ioned effects. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: pendulum system of seismic isolation; mathematical model; torsional oscillations. 1. Introduction The analysis of seismic isolation systems (SIS) is generally performed u der kinematic excitations defined by horizontal ground motions. The influence of vertical and rotational components of earthquake excitation on the © 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 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. * Correspon ing author. Tel.: +7-952-368-4328 E-mail address: 89523684328@mail.ru (D. E. Bondarev). * Corresponding author. Tel.: +7-952-368-4328. E-mail address: 89523684328@mail.ru (D. E. Bondarev).

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.032