PSI - Issue 5

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 5 (2017) 1237–1244 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 An Elasto-plastic Analysis of a DP600 Bi-Failure Specimen: Digital Image orrelati n, Finite Element and Meshless Methods Behzad V. Farahani a,b,* , Jorge Belinha a,b , Paulo J. Tavares a , P. M. G. P. Moreira a a INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, Dr. Roberto Frias Street, 400, 4200-465, Porto, Portugal. b FEUP, Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465, Porto, Portugal. Abstract An elasto-plastic study of a bi-failure specimen made of DP600 steel under tensile loading state is proposed in this work. As an experimental study, Digital Image Correlation (DIC) technique is used to measure the reaction force response as a function of the acquired displacement field. In addition, the strain and the stress variation on the specimen surface is also captured. The geometrical and material characteristics used to construct the numerical model are in agreement with the experimental specimen. To access the performance of the numerical techniques, the elasto-plastic pro lem is therefore solved with two advanced discretization formulations, Finite Element Method (FEM) and Radial Point Interpolation Meshless Method (RPIM), to obtain comparable numerical results. Numerically, the adopted elasto-plastic plane stress formulation relies on von-Mises yield criteria based on a return mapping algorithm. An iterative process of pseudo-time stepping scheme is applied and incremental displacement steps are enforced. This study uses the Newton-Raphson non-linear solution algorithm to achieve the non-linear solution. The obtained numerical results, such as force/displacement variation and effective plastic strain, are validated with the experimental DIC solution showing that the supporting computational methodology is valid and accurate. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibil ty of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal An Elasto-plastic Analysis of a DP600 Bi- ailure Specimen: Digital Image Correlation, Finite Element and Meshless Methods Behzad V. Farahani a,b,* , Jorge Belinha a,b , Paulo J. Tavares a , P. M. G. P. Moreira a a INEGI, Institute of Science and Innov t on in Mechanical nd Ind strial Engine ri g, Dr. Roberto Frias Street, 400, 4200-465, Porto, Po tugal. b FEUP, Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465, Porto, Portugal. Abstract An elasto-plastic study of a bi-failure specimen made of DP600 st el under tensil loading tat is proposed in this work. As an experimental study, Digital Image Correlation (DIC) technique is us d to me sure the reaction force response as a function of the acquired displacement field. In addition, the strain and the stress variation on the specime surface is also captured. Th geom trical and mat rial characteristi s used to construct the numerical model are in agreemen with the experimental specime . To access the per ance of the umerical techniques, the elasto-plastic problem is therefore solved with two advanced discretization formulations, Finit Element Method (FEM) and Radial Point Int rpolation Meshless Method (RPIM), to obtain comp rable numerical esults. Numerically, the adopted elasto-plastic plane stress formulation relies on von-Mises yield riteria b sed on a return ma ping algorithm. An iterative process of pseudo-time stepping scheme is applied and incremental displacement steps are enforced. This study uses the Newton-Raphson non-linear solutio algorithm to achieve the non-linear solution. The obtained numerical results, such as force/dis lacement variati n nd ffective plastic strain, are validated with the experimental DIC solution showing that the supporting computational methodology is valid and accurate. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scie tific Committe o ICSI 2017. © 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: Elasto-plastic; Finite Element Method; Digital Image Correlation; RPIM, Bi-failure. Keywords: Elasto-plastic; Finite Element Method; Digital Image Correlation; RPIM, Bi-failure.

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

* Corresponding author. Tel.: +351 225082151. E-mail address: behzad.farahani@fe.up.pt * Correspon ing author. Tel.: +351 225082151. E-mail address: behzad.farahani@fe.up.pt

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.2017.07.092 * 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.