PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 301–308 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2017) 000–000

www.elsevier.com/locate/procedia www.elsevier.com / locate / procedia 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. 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) Computer design of porous and ceramic piezocomposites in the finite element package ACELAN Anna Kudimova a , Ivan Mikhayluts a , Dmitryi Nadolin a , Andrey Nasedkin a, ∗ , Anna Nasedkina a , Pavel Oganesyan a , Arcady Soloviev a,b a Institute of Mathematics, Mechanics & Computer Science, Southern Federal University, Miltchakova str., 8a, Rostov on Don, 344090, Russia b Department of Theoretical and Applied Mechanics, Don State Technical University, Gagarin sq., 1, Rostov-on-Don, 344000, Russia Abstract The paper is devoted to finite element software ACELAN-COMPOS developed by the authors. It presents the approaches to the determination of the e ff ective properties of piezoelectric two-phase composite materials based on the e ff ective moduli method, the algorithms for generating representative volumes with specified properties, and the finite element techniques. Brief description of two algorithms of representative volume generation are provided. One of these algorithms supports connectivity between two phases of the composite, and the other creates inclusions in granular shape as the second phase. The results of calculating the e ff ective moduli of porous piezoceramics with open and closed porosity and the e ff ective moduli of polycrystalline piezoceramics are given. c ⃝ 2017 The Authors. Published by Elsevier B.V. P er-revi w under responsibility of th CM 2017 organizers. Keywords: two-phase piezocomposite, porous piezoceramics, e ff ective moduli, representative volume, finite element software Piezoelectric materials are widely used in modern engineering because due to the piezoelectric e ff ect they enable to convert electrical energy into mechanical energy and vice versa. In order to improve the e ffi ciency of these materials, the piezoelectric composites based on piezoceramic matrices have been developed recently (see Akdogan et al. (2005); Kara et al. (2003), etc.). Porous piezoceramic materials appeared to be perspective for use both as the elements for acoustic transmitters and as renewable energy sources [Ringgaard et al. (2015); Rybyanets (2011); Topolov and Bowen (2009)]. As it turned out, in comparison with dense ceramics, porous piezoceramics had small acoustic impedance, but su ffi ciently high values of piezoelectric sensitivities and thickness piezomoduli. However, porous piezoceramics are less sti ff compared to dense ceramics. To improve the mechanical properties of porous piezoceramics, more rigid XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Co puter design of porous and cera ic piezoco posites in the finite ele ent package ACELAN Anna Kudimova a , Ivan Mikhayluts a , Dmitryi Nadolin a , Andrey Nasedkin a, ∗ , Anna Nasedkina a , Pavel O anesyan a , Arcady Soloviev a,b a Institute of Mathematics, Mechanics & Computer Science, Southern Federal University, Miltchakova str., 8a, Rostov on Don, 344090, Russia b Department of Theoretical and Applied Mecha ics, Don State Technical University, Gagarin sq., 1, Rostov-on-Don, 344000, Russia Abstract The paper is devoted to finite element software ACELAN-COMPOS developed by the authors. It presents the approaches to the determination of the e ff ective properties of piezoelectric two-phase composite materials based on the e ff ective moduli method, the algorithms for generating representative volumes with specified properties, and the finite element techniques. Brief description of two algorithms of representative volume generation are provided. One of these algorithms supports connectivity between two phases of the composite, and the other creates inclusions in granular shape as the second phase. The results of calculating the e ff ective moduli of porous piezoceramics with open and closed porosity and the e ff ective moduli of polycrystalline piezoceramics are given. c ⃝ 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: two-phase piezocomposite, porous piezoceramics, e ff ective moduli, representative volume, finite element software 1. Introduction Piezoelectric materials are widely used in modern engineering because due to the piezoelectric e ff ect they enable to convert electrical energy into mechanical energy and vice versa. In order to improve the e ffi ciency of these materials, the piezoelectric composites based on piezoceramic matrices have been developed recently (see Akdogan et al. (2005); Kara et al. (2003), etc.). Porous piezoceramic materials appeared to be perspective for use both as the elements for acoustic transmitters and as renewable energy sources [Ringgaard et al. (2015); Rybyanets (2011); Topolov and Bowen (2009)]. As it turned out, in comparison with dense ceramics, porous piezoceramics had small acoustic impedance, but su ffi ciently high values of piezoelectric sensitivities and thickness piezomoduli. However, porous piezoceramics are less sti ff compared to dense ceramics. To improve the mechanical properties of porous piezoceramics, more rigid © 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. 1. Introduction

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. ∗ Corresponding author. Tel.: + 7-863-297-5282 ; fax: + 7-863-297-5113. E-mail address: nasedkin@math.sfedu.ru 2210-7843 c ⃝ 2017 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of the MCM 2017 organizers. ∗ Corresponding author. Tel.: + 7-863-297-5282 ; fax: + 7-863-297-5113. E-mail address: nasedkin@math.sfedu.ru 2210-7843 c ⃝ 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.046