PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 3713–372 Available online at www.sciencedirect.com ScienceDire t Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy A Peridynamic Model for Ductile Fractur of Moder tely Thick Plates Uğur Yolum a,b , Ahmet Taştan a , Mehmet A. Güler a* a Department of Mechanical Engineering, TOBB University of Economics and Technology, Sö ğ ütözü, Ankara 06560, Turkey b Helicopter Group, Turkish Aerospace Industries (TAI), Kazan, Ankara 06980, Turkey Abstract This paper presents an effective modeling technique for propagation of mode I cracks in ductile materials using Peridynamics Implemented Finite Element Analysis (PDIFEA) in ABAQUS. Peridynamics is a nonlocal theory which removes the restrictions of fracture modeling in classical continuum mechanics. PDIFEA models of different Compact Tension (CT) specimens are generated using truss elements. The yield stretch of a bond is analytically determined by equating total force across fracture surface in yield sta e and experimentally measured yield strength of the material. The critical stretch of the bond is related to critical strain energy release rate. A new constitutive model is proposed for the bond failure which depends on yield stretch and critical stretch value. Load versus crack mouth opening displacement results are calculated and validat d with the published results in the open literature. Based on the results obtained in this study, it can be indicated that PDIFEA with proposed constitutive model for two dimensional is capable of capturing ductile damage in CT specimens. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: peridynamics; fracture mechanics; finite element analysis; nonlocal; failure 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy A Peridynamic Model for Ductile Fracture of Moderately Thick Plates Uğur Yolum a,b , Ahmet Taştan a , Mehmet A. Güler a* a Department of Mechanical Engineering, TOBB University of Economics and Technology, Sö ğ ütözü, Ankara 06560, Turkey b Helicopter Group, Turkish Aerospace Industries (TAI), Kazan, Ankara 06980, Turkey Abstract This paper presents an effective modeling technique for propagation of mode I cracks in ductile materials using Peridynamics Implemented Finite Element Analysis (PDIFEA) in ABAQUS. Peridynamics is a nonlocal theory which removes the estriction of fracture modeling in classic l continuum mechanics. PDIFEA models of different Compact Tension (CT) specimens are generated using truss element . The yield stretch of a bond is analytically determined by equating total force across fracture surf c in yield state and exp ri entally measured yield strength of the material. Th cr tical str tch of the bond is related to ritical str in e ergy elease rat . A new constitutive model is p oposed or the bond failure which d pends on yield stretch and critical stretch value. Load ve sus crack mouth opening displacement results ar calcul ted and vali ated with the published results in the open literature. Based on the results obtai ed in his study, it can b indicated that PDIFEA with propos d con titutiv model f r tw - dimensional is capable of capturing duct le dam g in CT specimens. © 2016 The Authors. Published by Elsevi r B.V. Peer-review under esponsibility of the Scientific Committee of ECF21. Keywords: peridynamics; fracture mechanics; finite element analysis; nonlocal; failure Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21.

Nomenclature PD Nomenclature PD

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Peridynamics FEA Finite Element Analysis PDIFEAPeridynamic Theory Implem nted in Finit Element Analysis CCM Classical Continuum Mechanics Peridynamics FEA Fin te Element Analysis PDIFEAPer dyna ic Theory Implemented in Finite Element Analysis CCM Classic l Continuum Mechanics Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: 90 312 292 4088; E-mail address: mguler@etu.edu.tr * Corresponding author. Tel.: 90 312 292 4088; E-mail address: mguler@etu.edu.tr

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.461