PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 562–568 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. Structural Integrity Procedia 00 (2017) 000 – 000

www.elsevier.com/locate/procedia . l i r. /l t / r i

www.elsevier.com/locate/procedia

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. Modelling of Barium Titanate Microstructure Based on Both the Boundary Element Method and a Homogenization Technique Mojtaba Biglar a , Feliks Stachowicz a , Tomasz Trze pieciński a, *, Magdalena Gromada b a Rzeszow University of Technology, al. Powstańców Warszawy 12, 35 -959 Rzeszów, Poland b Institute of Power Engineering, Ceramic Department CEREL, ul. Techniczna 1, 36- 040 Boguchwała, Poland This paper presents the results of research undertaken to develop a grain boundary element (BE) formulation for the micromechanical analysis of multilayer barium titanate ceramics. The BE formulation of the elastic problem is generated for single grains and polycrystalline aggregate of barium titanate (BaTiO 3 ) ceramics. In order to obtain BaTiO 3 powder, the solid-state technique was applied. The microstructure of sintered BaTiO 3 powder was examined in detail by scanning electron microscopy. Furthermore, image processing techniques and some numerical algorithms were employed to discretize the grain boundaries of ceram cs. The single crystals f homogenous BaTiO 3 are repre ent d as anisotropic elastic regions. A compreh nsive numerical code is generat d and image processing techniques are applied in order to discr tize the boundaries o grains and btain th exact coordinates of elements on the boundaries. Average thorium is developed to obtain the macro-stress and macro-strain. The numerical results show that the developed method is valid for analysing polycrystalline materials. The numerical investigations also show that the developed algorith is accurate enough to investigate the mechanical properties of a multilayer piezoelectric actuator. It is also found that the position of the interface as well as the type of material plays an important role in determining the effective properties of the multilayer actuator. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Mojtaba Biglar a , Feliks St chowicz a , Tomasz Trze pieciński a, *, Magdalena Gromada b a i it f l , l. t , - zes , l b I tit t f i i , i t t , l. i , - ł , l i t t lt t t l i l t l ti t i i l l i ltil i tit t i . l ti t l ti l i t i l i l t lli t i tit t i i . t t i i , t li t t t i li . i t t i t i i i t il i l t i . t , i i t i i l l it l t i ti t i i i . i l t l o i t i t i l ti i . e i i l i te i i t i li i t i ti t i f i o t i t t i t l t t i . t i i l t t i t t t i . numerical results show that the developed method is valid for analysing polycrystalline materials. The numerical investigations l t t t l l it i t t i ti t t i l ti ltilayer piezoel t i t t . t i l o f nd that the position of t i t ll t t terial plays an important role in determining the effective properties of the multilayer actuator. © 2017 The Authors. Published by Elsevier B.V. i i ilit t i ti i itt . © 2017 Th Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Sci nt fic Committe of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Type your keywords here, separated by semicolons ; Barium titanate, Boundary element method, Homogenisation : r r r , r t i l ; ri tit t , r l t t , i ti 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. E-mail address: tomtrz@prz.edu.pl rr i t r. - il : t tr r . . l

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.2017.07.173 * 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. - t r . li l i r . . i i ilit t i ti i itt .