PSI - Issue 2_A

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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 Defect induced shear instability and ASB failure in m tals Catherine Froustey a , Ivan Panteleev b , Elena Lyapunova b , Oleg Naimark b, * a Univ. Bordeaux, I2M,UMR5295, 351 Cours de la Liberation, 33405 Talence, France b Institute of Continuous Media Mechanics UB RAS, 1 Acad. Korolev str., 614013 Perm, Russia Abstract In-situ experimental data and structural analysis of recovered samples are used to support the multiscale modeling of dynamic strain localization and damage-failure transitio as the precurs s of adiabatic she r failure. New mechanism of adiabatic shear failure formation is proposed that links the multiscale collective behavior of typical mesoscopic defects (microshears) and generation of collective modes of defects responsible for characteristic stages of strain and damage localization under dynamic loading. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Adiabatic shear bands, structural-scaling transition, blow-up kineteics 1. Mechanisms of adiabatic shear failure A major dynamic d formation and failure mechanism of crystall ne solids consi ts of abrupt localization of the plastic deformation into narrow zones referred as dia atic shear bands (ASB) (Bai and Dodd (1992)). Z ner and Holomon (1944) proposed that the inherent temperature rise causes material softening, which may overcome the strain hardening effect, ultimately leading to strain localization. However, for most materials exhibiting dynamic localization, the temperature rise prior to the loss of load-bearing capacity is quite small and apparently insufficient to significantly soften the uniformly deforming material. Alternatively, it was proposed in (Naimark (2003), Rittel et. al (2006)), that the dynamic stored energy of cold work, namely the part of the energy that is not dissipated into heat causes microstructural rearrangements with the formation of new nano-sized grains. The presented viewpoint is based on the experimental observations of defect induced microstructure rearrangements providing the effective 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Defect induced shear instability and ASB failure in metals Catherine Froustey a , Ivan Panteleev b , Elena Lyapunova b , Oleg Naimark b, * a Univ. Bordeaux, I2M,UMR5295, 351 Cours de la Liberation, 33405 Talence, France b Institute of Continuous edia Mechanics UB RAS, 1 Acad. Korolev str., 614013 Perm, Russia Abstract In-situ experimental data and structural analysis of recovered samples are used to support the multiscale modeling of dynamic strain localization and damage-failure transition as the pr cursors of adiabatic shear failure. New me hanism of adiabatic shear failure formati n is proposed that links the multiscale collective behavior of typic l mesoscopic defects (microshears) and gene ati n of c llective modes of defects responsible for characteristic stages of strain and damage localization under dynamic loading. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Adiabatic shear bands, structural-scaling transition, blow-up kinet ics 1. Mechanisms of adiabatic shear failure A major dynamic deformation and failure mechanism f crystalline solids consists of abrupt localization of the plastic defo mation into ar ow zo es r fe red as adiabatic shear ba ds (ASB) (Bai and Do d (1992)). Z ne and Holomon (1944) proposed that the inher nt t mperature rise c uses m terial softe ing, which may overcom the strain hardening effect, ultim ely leading o strain localization. However, for most materials exhibiting dynamic localization, the t mperature ris prior to the loss of ad-beari g capacity is quite small and apparently insufficient t signif cantly soften the niformly def rming material. Alternatively, it wa propo ed in (Naimark (2003), Rittel et. al (2006)), that the dynamic st ed en rgy of cold work, namely h part of the energy that is not dissipated into h at causes micros ructural rearrang me ts with the formation of new nan -siz d grains. The presented viewp int is b sed on the experiment l obs rvations of defect induced microstructure r arrangements oviding th effec ive 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. © 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.: +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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.:+7-342-237-8312; fax:+7-342-237-8487. E-mail address: naimark@icmm.ru * Corresponding author. Tel.:+7-342-237-8312; fax:+7-342-237-8487. E-mail address: naimark@icmm.ru

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.2016.06.246