PSI- Issue 9

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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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. IGF Workshop “Fracture and Structural Integrity” Evolution of fracture mechanics parameters for cracks in residual stress fields Yu. Matvienko a, *, S. Eleonsky b , V. Pisarev b a Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN), 4 Maly Kharitonyevsky Pereulok, Moscow, 101990 Russia b Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI), Zhukovsky Moscow Region, 140180 Russia Abstract The paper is devoted to determination of crack mouth opening displacements (CMOD), stress intensity factors (SIF) and T-stresses for cracks emanating from cold expanded holes and welds at different stages of cyclic loading. Rectangular plates made from aluminum alloys are the objects of present investigation. A sequence of narrow notches, which are performed under the constant external load, is used for crack modelling. The experimental approach employs optical interferometric measurements of local deformation response to small notch length increment. Initial experimental data represent in-plane displacement component values measured by electronic speckle-pattern interferometry in the vicinity of the crack tip. Thus, the CMOD values are derived directly. The t a sition from measured in-plane displacement c p ents to equired SIF and T-stre s values follows from the relati sh ps of modified version of the crack compliance method. Experimental res lts ar obt ined for uniaxial t nsion-compression loading of specimens with the for e direction is perp ndicular to the crack li e. Experimental data pro ide constructing the dependencies of fracture mechanics parameters for cracks of fixed lengths from a loading cycle number, which are of gre t interest to estim te residual stress effect on fatigue crack growth. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Cold expansion; Welded joints; Crack growth; CMOD; SIF; T-stress IGF Workshop “Fracture and Structural Integrity” Evolution of fracture mechanics parameters for cracks in residual stress fields Yu. Matvienko a, *, S. Eleonsky b , V. Pisarev b a Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN), 4 Maly Kharitonyevsky Pereulok, Moscow, 101990 Russia b Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI), Zhukovsky Moscow Region, 140180 Russia Abstract The paper is devoted to determination of crack mouth op ning displac ments (CMOD), stress intensity f ctors (SIF) and T-stresses for cracks emanating from cold ex anded hol and welds at different stages of cyclic loading. Rectangular plates made from aluminum lloy ar the objects of pr se t investigation. A sequence of narrow notches, which a e p rfor d nder the constant exte nal l ad, is used for crack mod lling. Th experimental approach employs optical interf rometric easureme ts of local deformation r sponse to smal notch length incre nt. I itial experimental data represent in-plane displacement component values measured by electronic peckle-pattern interf rom ry in the vicinity of th crack tip. hus, the CMOD values are derived directly. The transition from measured in-plane displacement com onents required SIF and T-stress values follows fr th relationships modified version of the crack compliance method. Experimental results are obtained for uniaxial tension-compression l ading of spe im ns with the force direction i perpendicul r to the crack line. Experim ntal data provide constructing he dependencies of fracture mechanics parameters for c acks of fixed lengths from a loading cycle number, which are of great inter st to esti ate residual stress effect on fatigue crack growth. © 2018 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Cold expansion; Welded joints; Crack growth; CMOD; SIF; T-stress

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +7-916-100-91-55; E-mail address: ygmatvienko@gmail.com * Correspon ing author. T l.: +7-916-100-91-55; E-mail address: ygmatvienko@gmail.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2018.06.005 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.