PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 318–324 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

www.elsevier.com/locate/procedia . l i r. /l t / r i

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Study of the spatial-time inhomogeneity of inelastic deformation and failure in bodies with concentrators by using the digital image correlation and infrared analysis Tatyana Tretyakova a *, Valery Wildemann a a Centre of Experimental Mechanics, Perm National Research Polytechnic University, 29 Komsomolsky AVE, Perm 614990, Russia This paper is concerned with the experimental study of the temporal instabilities and spatial inhomogeneity of the plastic flow in metals due to the Lüder’s behavior , the evolution of the postcritical deformation and damage accumulation in specimens of the carbon steel (C1010) with concentrators. Here, digital image correlation and infrared thermography are used as full-field techniques to obtain inhomogeneous displacement, strain and temperature fields. It is shown the influence of the stress concentrators on the yield delay effect and on the processes of the i itiation and propag tion of the localized deformation b s during un axial tensi tests. Based on t e previously considered criteria of the transition of the deformation process to the postcritical deformation stage, the evolution of the postcritical deformation zone was observed and identified on the surface of the specimens with concentrators. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: digital image correlation; ifrared analysis; stress concentrator; the Chernov- Lüder’s behaviour; postcritical deformation; failure. na a t f i t l i , ti l l t i i it , l , , i Abstract i i it t i t l t t t l i t iliti ti l i it t l ti l i t l t t i , t l ti t t iti l ti l ti i i t t l it t t . , i it l i l ti i t ll i l t i t t i i i l t, t i t t i l . t i t i l t t t t t i l l t t t i iti ti ti t l li ti i i l t i t t . t i l i it i t t iti t ti t t t iti l ti t , t l ti t t iti l ti i ti i t t i it t t . © 2017 The Authors. Published by Elsevier B.V. i i ilit t i ti i C itt . : i it l i rr l ti ; ifr r l i ; tr tr t r; t r - r’ i r; t riti l f r ti ; f il r . © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. It is well known that the mechanical b havior of the structural carbon steel exhibits unstable plastic deformation in a given range of strain rates and temperatures. On the macroscopic level, the spatial-time inhomogeneity occurs in the form of the yield delay effect and the Chernov- Lüder’s deformation [ Krishtal (2004), Wijler et al (1971)], and the t i ll t t t i l e i t t t l t l i it t l l ti ti i i t i t t t . t i l l, t ti l ti i it i t t i l l t t ti i t l , ijl t l , t Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction . i

* Corresponding author. Tel.: +7-912-499-5960; fax: +7-342-219-8732. E-mail address: cem.tretyakova@gmail.com i t r. l.: - - - ; f : - - - . - il : .tr t il. rr

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.177 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. l i r . . i i ilit t i ti i itt . - t r . li