PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 2873–288 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 il l li t . i ir t. tr t r l I t rit r i ( )

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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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy A nonlinear procedure for the analysis of RC beams Patrizia Bernardi, Roberto Cerioni, Elena Michelini* DICATeA, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy This work deals with the development of a computational method for the nonlinear analysis of reinforced concrete beams subjected to general loading and constraint conditions, able to catch crack formation and propagation. To this aim, a layered beam finite element is developed. The displacement field along beam axis and height is modelled through polynomial functions, whose number of terms is vari d bas d n the complexity of the considered pr blem. The m chanical nonlinearity f the material is taken nt account by implementing a smeared constitutive model for cracked reinforced concrete elements. The effectiveness of the proposed procedure, which can be applied to the analysis of both new and existing buildings, is proved through comparison with significant experimental data from technical literature, relative to both statically determinate and indeterminate beams. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Reinforced concrete; layered beam finite element; nonlinear behavior; smeared model; crack width 1. Introduction The predi tion of the behavior reinforced concrete (RC) structures is a quite complex task, since m chanical nonlin arity should be taken into accou t even under low loads, due to crack formation. At ultimate limit state, this aspect, combined to the interaction between materials, largely influences the structural global behavior as well as failure conditions, especially in terms of ductility. In case of RC beams subjected to general loading and constraint conditions, the development of efficient numerical methods, based on a simplification of the actual displacement field and able of correctly describing the mechanical behavior of the material, is even less straightforward. Further modeling difficulties arise indeed from the need of , , I , i rsit f r , r r ll i z / , r , It l t t i r l it t l t f t ti l t f r t li r l i f r i f r r t j t to general loa i tr i t iti , l t t r f r ti r ti . t i i , layered beam finite l t i l . i l t fi l l i i t i ll t r l i l f ti , r f ter i rie e t l it f t i r ro l . i l li rit f t t ri l i t i t t i l ti r tit ti l f r r r i f r r t l t . ff ti f t r r r , i li t t l i f t i ti il i , i r t r ri it i ifi t ri t l t fr t i l lit r t r , r l ti t t t ti ll t r i t i t r i t . t r . li l i r . . r-r iew under re p i ilit f th cientifi itt f . r s: i f r r t ; l r fi it l t; li r i r; s r l; r i t 1. Introduction i ti t i f i t t t i it l t , i i l li it l t i t t l l , t ti . t lti t li it t t , t i t, i t t i t ti t t i l , l l i l t t t l l l i ll il iti , i ll i t tilit . j t t l l i t i t iti , t l t i i t i l t , i li i ti t e actual displacement field and able of correctly describing t i l i t t i l, i l t i t . t li i i lti i i t Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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. Abstract

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. ls i r . . r-r i r r i ilit f t i tifi itt f . * Corresponding author. Tel.: +39-0521-905709; fax: +39-0521-905924. E-mail address: elena.michelini@unipr.it i t r. l.: - - ; f : - - . - il r ss: l . i li i i r.it - t rs. lis rr s

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.359