PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 199–2 6 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

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 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 Generalization of Neuber’s Rule for the Assessment of Local Stresses and Strains in Stress Concentration Zones for a Wide Range of Applied Strains Nikolay A.Makhutov a , Dmitry O.Reznikov a * a Mechanical Engineering Research Institute, 4 Maly Kharitinievsky lane, Moscow,101990, Russia Abstract Neuber rule is widely used to estimate stress-strain behavior of notched components upon local yielding occurs. This method proved to be useful in predicting maximum local strains and stresses in case of limited plasticity. However, the accuracy of the method drops considerably when extensive plastic strains develop. The paper describes a modification of the Neuber rule that allows assessing elasto-plastic material response at the notch root to extreme loading regimes when maximum notch strains are close to fracture strain values © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://cr a ivecommons.org/licenses/by-nc-nd/4.0/) Sel ction and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords : Neuber r le; general plasticity; notch, local stress; local str in; stress concentration factor; strain concentration fa tor; 1. Introduction Processes of fracture of structural components and machine parts are usually initiated in stress concentration zones such as fillets, holes, welds, grooves and keyholes that are commonly referred to as notches (Makhutov, 1981; Makhutov, 2008). A ses ment he material response t various loading regimes in these zones is thus one of the 2nd International Conference on Structural Integrity and Exhibition 2018 Generalization of Neuber’s Rule for the Assessment of Local Stresses and Strains in Stress Concentration Zones for a Wide Rang of Applied Strain Nikolay A.Makhutov a , Dmitry O.Reznikov a * a Mechanical Engineering Research Institute, 4 Maly Kharitinievsky lane, Moscow,101990, Russia Abstract Neuber rule is widely us to estimate stress-strain behavior of notched componen s u on local yielding occurs. This method prove to be useful in predicting maximum local strains an stresses in case of limited plasticity. However, the accuracy of the method drops considerab y when xtensive plastic strai s devel p. The pap r describ s a modification of the Neuber ule that a lows assessing el sto-p astic material response at the notch root to extreme loading regimes when maximum notch strains are close to fracture strain values © 2018 The Aut ors. Published by Elsevier B.V. This is an open access art cle und r the CC BY-NC-ND lic nse (https://cr ativecommons.org/licens s/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords : Neuber rule; gener l pla ticity; notch, local st ess; local tr in; stress concentration f ctor; strain concentration factor; 1. Introduction Processes of fracture of structural components and m chine parts are usually initiated in stress concentration zones such as fillets, holes, welds, grooves and keyhol s that are commo ly referred to as notch (Makhutov, 1981; Makhutov, 2008). Assessment of the material response to various loading regimes in these zones is thus one of the © 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.: +7-495-623-5835; fax: +7 495 623-57-55. E-mail address: mibsts@mail.ru * Corresponding author. Tel.: +7-495-623-5835; fax: +7 495 623-57-55. E-mail address: mibsts@mail.ru

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.2019.05.026