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 Struc ural Integrity 5 (2017) 1198–12 4 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

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Numerical study on damage identification using shearography with different shearing amounts J. V. Araújo dos Santos a, *, H. Lopes b , P. Moreno-García c a IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal b DEM-ISEP, Instituto Politécnico do Porto, Portugal c Departamento de Ingeniería Mecánica y Diseño Industrial, Escuela Superior de Ingeniería, Universidad de Cádiz, Spain Abstract Shearography is a technique appropriate for the analysis of damage, namely by allowing the direct measurement of the gradient or derivative of the displacement field, i.e. the rotation field. This technique is based on the subtraction of the phase of laser light coming from the reflection at two neighboring points in the surface. The distance between these two points define what is called shearing amount. The measurement sensitivity can be adjusted by varying the shearing amount, such that we obtain large sensitivities with high values of this parameter. However, high values of shearing amount lead to the smoothing of the results. In this paper, a study on damage identification in beams using shearography with different shearing amounts is reported. Damage indicators based on differences in modal curvatures are applied to data coming from simulation of shearography. These damage indicators show a great dependency on the shearing amount, such that, for instance, with large values of this parameter the damage is spread across a larger area than the actual one. The peak values of the damage indicators present an attenuation and the damaged area also increases with the shearing amount. According to the findings presented in this paper, it is advisable to take precautions when localizing damage with measure ents obtained with shearography. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Damage identification; Modal curvature; Shearography; Shearing amount; Finite element method; Finite difference method 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Numerical study on damage identification using shearography with different shearing amounts J. V. Araújo dos Santos a, *, H. Lopes b , P. Moreno-García c a IDMEC, Instituto Superior Técnico, Universidade de Lisbo , Portugal b DEM-ISEP, Instit to Politécnico do Port , Portugal c Departamento de Ingeniería Mecánica y Diseño Industrial, Escuela Superior de Ingeniería, Universidad de Cádiz, Spain Abstract Shearography is a technique appropriat for the nalysis of damage, namely by llowi g the direct measurement of the gradient or derivative of displacement field, i.e. the rotation field. This technique is bas d on the subtracti n f he phase of laser light coming fro the reflection at two eighboring points in the surface. The distance betwee these two points define wha is called hearing amount. T e mea urement sensitivity can b adjusted by varying the shearing am unt, such that we obtain large sensitivities with high v lues of this par meter. However, high v lues of shearing amou t lead to the smoothing of th results. In this paper, tudy on damag identific tion in beams using shearography with different shearing amounts is report d. Da based on differences in modal curv tures are applied to data coming from simulation of shearogr phy. Thes ndicators sh w great depende cy on the shearing amount, such that, for instance, with larg values of this parameter the damage is spread across a larger ar a than the ctual one. The peak values of the damage indicators present an attenuation and the damaged area a so increases with the shearing a ount. Accor ing to t findings presented in this paper, it is advisable to take precautions when localizing damage with measurements obtained with shearography. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Damage identification; Modal curvature; Shearography; Shearing amount; Finite element method; Finite difference method © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

© 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.

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.2017.07.039 * 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. * Correspon ing author. Tel.: +0-351-21-841-9463 ; fax: +0-351-21-841-7915. E-mail address: viriato@tecnico.ulisboa.pt * Corresponding author. Tel.: +0-351-21-841-9463 ; fax: +0-351-21-841-7915. E-mail address: viriato@tecnico.ulisboa.pt