PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 362–374 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Buckling and vibrations of FGM circular plates in thermal environment Rahul Saini �,� , Shivam Saini � , Roshan Lal � , Indra Vir Singh � � , � Abstract An analysis is resented for t e study of thermal environment on free axisymmetric vibrations of functionally graded circular plates subjected to uniform in-plane peripheral loading and non-linear temperature distribution along the thickness direction. It is assumed that the plate material is graded in thickness direction and mechanical properties are temperature-dependent. Hamilton’s principle has been used in obtaining the governing equations for thermo-elastic equilibrium and vibration for such a plate model on the basis of classical plate theory. Generalized differential quadrature rule has been used in evaluating the numerical values for thermal displacements and frequencies in case of clamped and simply supported plates at the periphery for the first three modes of vibration. Compressive in-plane loads for which the plate ceases to vibrate have been reported as critical buckling loads. Effects of various parameters have been analyzed on the vibration characteristics for all the modes. For uniform and linear temperature distribution, the benchmark results have been computed. A a special case, a study with the plate material having tempe ture-i dependent properti s has been performed. Results have been c mpared with th published work. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco mons. rg/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Circular plates; functionay graded; in-plane force; temperature-dependent material; non-linear temperature; generalized differential quadrature rule. 2nd International Conference on Structural Integrity and Exhibition 2018 Buckling and vibrations of FGM circular plates in thermal environment Rahul Saini �,� , Shivam Saini � , Roshan Lal � , Indra Vir Singh � � , � Abstract An analysis is prese ted for the study of thermal e vironme t o free axisymm tr c vibrations of func ionally grad d circular plates subjected to uniform in-plane p ripheral loading and non-linear temper tu e dis ribution along he thickness direction. It i assumed t t th plat material is graded in thick ess direction and mechanical properties are tempe ure-dependent. H milt n’s principle has been used in obtaining the governing equations for thermo-elastic equilibri m and vibratio for such a plate mod l on the basis of cl ssical pl te theory. Generalized di ferential qua rature rule has b en us d in evaluat ng the numerical valu s for thermal displacements and frequencies in case of clamped and simply supported plates at the periphery fo he first three mo es o vibration. Comp essiv in-plane loads for which the plate ceases to v brate have be n reported as critical buckling loads. Effects of various param ters have been n lyzed o the vibration characteristics for all the modes. For uniform an linear distributio , the benchmark r sults have b en comput d. As a special case, a study with the plate material having temperature-independent properties ha been performed. Results have been compared with the ubl shed work. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Circular plates; functionay graded; in-plane force; temperature-dependent material; non-linear temperature; generalized differential quadrature rule.

© 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.

* Corresponding author. Tel.: +91-812-651-5226 . E-mail address: rahulsainiiit@gmail.com * Corresponding author. Tel.: +91-812-651-5226 . E-mail address: rahulsainiiit@gmail.com

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 a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

* 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 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.2019.05.045