PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 171–178 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

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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Investigation of aggregate size effects on the compressive behavior of concrete by electromechanical and mechanical impedance spectroscopy Baris Arslan *a , Tuncay Kamas b a Eskisehir Osmangazi University, Civil Eng. Dept. Eskisehir, 26480, Turkey b Eskisehir Osmangazi University, Mech. Eng. Dept. Eskisehir, 26480, Turkey Concrete is a composite material that is composed of cement mortar and aggregate. The size of the aggregates in the internal structure of concrete affects the mechanical properties and compressive strength of the concrete. In this study, three-dimensional concre e models are created by idealizing the material properties such as modulus of elasticity and mass density which were experimentally acquired in order to investigate the effect of varying size of the aggregates on the compressive strength of concrete cubes the age of 28 days. Piezoele tric c ramic patches (PZT) are embed ed in the core of the concrete cube models with aggregates in fine, medium, and coarse sizes and the harmonic analyses are simulated in commercial software, ABAQUS ® using the multi-physics finite element method (MP-FEA). Eventually, electromechanical impedance spectroscopy (EMIS) results as w ll as mechanical impedance spectroscopy (MIS) results are obtained to highlight the relative changes in the impedance results depending on the aggregate sizes. Thus, EMIS and MIS simulation results are employed in order to predict the effects of varying aggregate sizes on the compressive strengths of the concrete models. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Investigation of aggregate size effects on the compressive behavior of concrete by electromechanical and mechanical impedance spectroscopy Baris Arslan *a , Tuncay Kamas b a skisehir Os angazi University, Civil Eng. Dept. Eskisehir, 26480, Turkey b Eskisehir Osmangazi University, Me h. Eng. Dept. Eskisehir, 26480, Turkey Abstract Concrete is a composite material that is composed of cement mortar and aggregate. The size of the aggregates in the i ter l stru ture of concret affects the mechanical properties and compres ive strength of the concrete. In this study, three-dimensional concrete models are created by idealizing the material properties such as modulus of elasticity and mass density which w r exp rimentally acquired in order to investigat the ffect of varying size of the aggregates on the compressive strength of crete cubes in the age of 28 days. Piezoel ctric cer mic patc es (PZT) are embedded in the cor of the concret cube models with aggregates n fine, medium, a d coarse sizes and the harmonic analyses are simulated in comm rcial s ftwar , ABAQUS ® using the multi-physics finite el ment method (MP-FEA). Eventually, electromechanical mpedance s ectroscopy (EMIS) results as well as mechanical impedance spectroscopy (MI ) r sults are obt ined to highlight the relative changes in the impedance results dep n ing on the aggregate sizes. Thus, EMIS and MIS simulation results are employed in order t predict the effects of varying aggregate sizes on the compressive strengths of the concrete models. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: SHM; concrete; aggregate size effect; electromechanical impedance; mechanical impedance; FEM Keywords: SHM; concrete; aggregate size effect; electromechanical impedance; mechanical impedance; FEM

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

* Corresponding author. Tel.: +90 5326381441. E-mail address: barslan@ogu.edu.tr * Correspon ing author. Tel.: +90 5326381441. E-mail address: barslan@ogu.edu.tr

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.2017.07.093 * 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 Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.