PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 6 (2017) 19–26 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Optimum control of energy dissipation in support-pendulum seismic isolation system for large NPP equipment Nadezhda Ostrovskaya a,b , Yury Rutman b, * a State Marine Technical University, Locmanskaya 3, 190121 Saint Petersburg, Russia b State University of Architecture and Civil Engineering, 2-ya Krasnoarmeiskaya 4, 190005 Saint Petersburg, Russia Abstract The paper presents the results of theoretical and experimental investigations of support-pendulum seismic isolation (SPSI) system, designed for protection of large NPP equipment against seismic, shock and vibration loads. SPSI is a set of separate supports, the composition of which includes pendulum bars with special fastener assemblies and plastic damper in the form of rod steel elements system. Full- scale seismic SPSI testing had been conducted on the Russia’s largest seismic platform ВСС -300. The tested SPSI had three supports, on which a 40- ton mockupup of NPP equipment had been installed. Mockupup size was 4.6×3.7×6.8 m. The testing reproduced three-component load input which corresponds to seismic input, intensity of which exceeded 9 as per the scale MSK 64. Decreasing horizontal accel ations nd speeds on the NPP equipment mockupup were approxim tely 2 tim s, the amplitude of horizontal displacement had increased on 20% approximately. Relative horizontal displacements of the mockupup were of quick-damped vibrations type that demonstrates the efficiency of using plastic dampers in the form of deformable rods. The procedure for design and selection of rational damper structural parameters includes searching the optimal parameters of viscous damping for linear dynamic model on the basis of construction of spectral density of seismic input power and selection of for the damper, ensuring damping, equivalent to optimal viscous damping. Purpose-oriented function of optimization is the minimum of dispersion of seismic isolated object accelerations. This experiment had confirmed the correctness of damper structure choice procedure for provision of the required dissipation level. XXVII Inter ational Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Optimum control of energy dissipation in support-pendulum seismic isolation system for large NPP equipment Nadezhda Ostrovskaya a,b , Yury Rutman b, * a State Mar ne Technical Univers ty, Locmanskaya 3, 190121 S int Petersburg, Russia b State University of Architecture and Civil Engineering, 2-ya Krasnoarmeiskaya 4, 190005 Saint Petersburg, Russia Abstract The paper pres nts the results of theoretical and experimental investigations of suppo t-pe dulum seismic isolati n (SPSI) system, designed for pr tection of large NPP quipment against seismic, shock and vibration loads. SPSI is a set of separate supports, th composi ion of which includes pendulum bars with special fastener assemblies and plastic damper in the form of rod steel lements system. F ll- scale seismic SPSI testi g had been conducted on th Russia’s large t seismic platform ВСС -300. The tested SPSI ad three su p rts, on which a 40- to mockupup of NPP equi ment had been i stalled. Mockupup size was 4.6×3.7×6.8 m. The testing reprodu d three-comp ent l ad input which corresp nds to seismic input, intensity of which exc eded 9 as per the sc le MSK 64. D reasing horizontal accele ations and speeds on the NPP quipment mockupup were appr ximately 2 times, the amplitu of horizontal isplacement had incr ased on 20% approximat ly. Relative horizontal di placements of the mockupup were of quick-dam ed vib ations type that demonstrates the efficiency of using pl stic dampers in the form of deformable rods. The procedure for design and sele tion of rational damper structural parameters includes searching the optimal parameters of viscous damping for linear ynamic model on the basis of construction of spectral density of seismic input power and selection of for the damper, ensuri g damping, equivalent to optimal viscous damping. Purpose-oriented function of optimization is the minimum of dispersion of seismic solated object accelerations. This experiment had confirmed the correctness of damper structure choice procedure for provision of the required dissipation level.

© 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. Peer-review under responsibility of the MCM 2017 organizers. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: support-pendulum seismic isolation system, NPP equipment, theoretical and experimental investigations, force characteristic, plastic dampers; Keywords: support-pendulum seismic isolation system, NPP equipment, theoretical and experimental investigations, force characteristic, plastic dampers;

* Corresponding author. Tel.: +7-911-835-55-52. E-mail address: ostrovskaya.nv@yandex.ru * Correspon ing author. Tel.: +7-911-835-55-52. E-mail address: ostrovskaya.nv@yandex.ru

* 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 MCM 2017 organizers. 2452- 3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

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.2017.11.004