PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 584–596 Available onlin at www.sci n edirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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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. © 2019 The Author . Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Poisson’s ratio on K I , T 11 and T 33 for SENB and CT specimen – A FE study Sanjeev M Kavale a , Krishnaraja G Kodancha a *, Nagaraj Ekabote a a School of Mechanical Engineering, KLE Technological University, Hubballi, India Abstract The level of constraint at a crack-tip/crack-front plays an important role in the fracture of the cracked component, and can be revealed by examining the details of the crack-tip/crack-front stress fields. Significant research on 2D crack-tip stress fields are available, however the real life cracks are 3D than 2D. There exists a gap in understanding constraint effects in different state of stress and 3D cracks. The T ij stress terms, together with the st ess intensity factor ( K I ), can provide a set f practical parameters for the characterization of near crack-front fields, nominally K-T ij . A limited amount of investigation is done on understanding the effect Poisson’s ratio on these constraint parameters on standard specimens suggested by ASTM. The main objective of the current research work is to understand the effect of Poisson’s ratio on Stress Intensity Factor ( K I ) and corresponding T ij -Stresses for SENB and CT specimens. Using FE analyses for a/W ratio of 0.50 and specimen thicknesses were studied for different Poisson’s ratio for SENB and CT Specimen. It is observed from the current work that, in both, SENB and CT specimens, for same applied stress, the maximum magnitudes of K I is observed at the center of the specimen. K I and corresponding T 11 are increasing with the increase in Poisson’s ratio of the specimen. However, the magnitude of T 33 is reducing with the increase in Poisson’s ratio in both CT and SENB specimens. An effort has been put to generate polynomial formulations which approximately estimate the magnitudes of K I , T 11 and T 33 . The values of K I and T ij obtained through these formulations are validated with the available experimental and FE results and a maximum error of 12% is observed. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/lic nses/by-nc-nd/4.0/) Selection nd peer-review under responsibil ty of Peer-revi w under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Poisson’s ratio on K I , T 11 and T 33 for SENB and CT specimen – A FE study Sanjeev M Kavale a , Krishnaraja G Kodancha a *, Nagaraj Ekabote a a School of Mechanical Engineering, KLE Technological University, Hubballi, India Abstract The level of constraint at a crack-tip/crack-front plays an important role in the fracture of the cracked component, and can be revealed by examining the details of the crack-tip/crack-front stress fields. Significant research on 2D crack-tip stress fields are available, however the real life cracks are 3D than 2D. There exists a gap in understanding constraint effects in different state of stress and 3D cracks. The T ij stress terms, together with the stress intensity factor ( K I ), can provide a set of practical parameters for the characterization of near crack-front fields, nominally K-T ij . A limited amount of investigation is done on understanding the effect Poisson’s ratio on these constraint parameters on standard specimens suggested by ASTM. The main objective of the current research work s to understand the effect of P isson’s ratio on Str ss Intensity Factor ( K I ) and corresp nding T ij -Stresses for SENB and CT specimens. Us g FE ana yse for a/W ratio of 0.50 and specimen thicknesses were studied for ifferent Poisson’s ratio for SENB and CT Speci en. It is obs rved from the current work that, in both, SENB and CT specimens, for sam applied stress, the maximum magnitudes of K I is observed at the center of the specimen. K I and corresponding T 11 are increasing with the increase in Poisson’s ratio of the specimen. However, the magnitude of T 33 is reducing with the increase in Poisson’s ratio in both CT and SENB specimens. An effort has been put to generate polynomial formulations which approximately estimate the magnitudes of K I , T 11 and T 33 . The values of K I and T ij obtained through these formulations are validated with the available experimental and FE results and a maximum error of 12% is observed. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.072 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresponding author. Tel.: +91 98865 96953. E-mail address: krishnaraja@kletech.ac.in Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt * Corresponding author. Tel.: +91 98865 96953. E-mail address: krishnaraja@kletech.ac.in