PSI - Issue 2_B

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 2 (2016) 026– 33 Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy J - A elastic-plastic crack tip field and the two-parameter fracture criterion Yu.G. Matvienko * , G.P. Nikishkov Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 M. Kharitonievsky Per., 101990 Moscow, Russia Abstract The paper deals with a review of theoretical and numerical aspects of the two-parameter J - A approach in elastic-plastic fracture mechanics. This approach is based on the three-term asymptotic expansion for the stress field near the tip of mode I crack in an elastic-plastic solid. The parameter A is introduced in fracture criterion as a constraint parameter. The unified J C - A master curve is con t u ed for different geometry and thickness of specimens. Constraint parameter A and J value for various configurations of specimens and the hardening exponent is computed by means of three-dimensional elastic-plastic stress analyses employing finite element method. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Three-term elastic-plastic asymptotic expansion; constraint parameter; J-A fracture criterion; finite element method 1. Introduction Analytical and numerical analysis of stress fields in the vicinity of the crack tip shows that, in many cases, these fields are strongly dependent on constraint There are two basic source of the crack-tip constraint. A change in in plan constraint is associated with cra k size, geo etry f specimen, type of loading and notch. In contrast to in plane constraint, out-of-plane constraint is due to thickness. A change of crack-tip constraint parameters leads to considerable influence on the fracture toughness (e.g., Sorem et al. (1991), Liu and Chao (2003), Meliani et al. (2011), Wang et al. (2008), Pluvinage et al. (2014), Henry and Luxmoore (1997)). For example, a standard 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy J - A elastic-plastic crack tip field and the two-parameter fracture criterion Yu.G. Matvienko * , G.P. Nikishkov Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 M. Kharitonievsky Per., 101990 Moscow, Russia Abstract The paper deals with a review of theoretical and numerical aspects of the two-parameter J - A approach in elastic-plastic fracture mechanics. Thi approach s based on the three-term asymptotic expansion f r the str ss field near the tip of mode I crack in an elastic-plastic solid. The parameter A is in roduc d in fracture riterio as a constraint parameter. The unified J C - A master curve is constructed f r ifferent geom try and thickness of specimens. Constraint parameter A nd J valu for various configurations of specimens and the hardening xponent is computed by eans of three-dimensional elastic-plastic stress analyses employi g finite ele ent method. © 2016 The Authors. Publishe by Elsevier B.V. Pe r-r view under es ons bili y of the Scientific Committee of ECF21. Keywords: Three-term elastic-plastic asymptotic expansion; constraint parameter; J-A fracture criterion; finite element method 1. Introduction Analytical and numerical analysis of stress fields in the vicinity of the crack tip shows that, in many cases, these fields re strongly dep ndent on constraint. There are two basic source of the crack-tip cons rai t. A ch nge in in plane con t ai t is associated with crack size, geom try f spe imen, type of lo ding and otch. In contrast to , out-of-plane c nstraint i due t thickness. A cha ge of crack-tip constrain parameters leads to considerable fluence on th frac ure oughn ss (e.g., Sorem et l. (1991), Liu and Chao (2003), M liani et al. (2011), Wang et al. (2008), Pluvinage et al. (2014) Henry and Luxmoore (1997)). F r example, a standard 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.: +7 499 135 1204. E-mail address: ygmatvienko@gmail.com * Corresponding author. Tel.: +7 499 135 1204. E-mail address: ygmatvienko@gmail.com

* 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.

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.2016.06.004