PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 477–484 Available online at www.sciencedirect.com ScienceDirect 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 Shock-induced structu al instability and dynamic strength of brittle solids Yurii Meshcheryakov*, Аlexandre Divakov, Natali Zhigach va, Grigorii Konovalov Institute of Problems of the Mechanical Engineering RAS, Saint-Petersburg, 199178, Russia Abstract Three kinds of brittle material – gabbro-diabase, gray iron of two modifications and fused quartz – have been tested under uniaxial strain conditions of shock loading. The local probing of the free surface of targets by using interferometric technique allows to determining the criterion for initial stage of brittle damage in the form of threshold value of local stress. This stress corresponds to appearance of horizontal step at the front of compressive pulse which evidences the nucleation of local source of damage. © 2016 The Authors. Published by Elsevier B.V. Pe r-r view under respon ibility of the Scientific Committee of ECF21. Keywords: shock tests, brittle materials, localized damage, dynamic compression, spall strength . 1. Introduction The initial dynamic fracture is an important stage of deformation process which defines the macroscopic strength of material. Nucleation and development of initial sources of damage is closely associated with the structural instabilities of dynamic deformation process. In their scale, the structural instabilities belong to mesoscale, which supposes that experimental study of response of material on shock loading should be carried out at the mesoscale as well. In the present work, the results of studying the dynamic fracture of brittle materials, namely, gabbro-diabase, gray iron and fused quartz are presented. The goal of research was a determination of the criterions for nucleation of localized structural instabilities as sources of initial stage of dynamic fracture of brittle materials. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Shock-induced structural instability and dynamic strength of brittle solids Yurii Meshcheryakov*, Аlexandre Divakov, Natali Zhigacheva, Grigorii Konovalov Institute of Problems of the Mechanical Engineering RAS, Saint-Petersburg, 199178, Russia Abstract Three kinds of brittle material – gabbro-diabase, gray iron of two modifications and fused quartz – have been tested under uniaxial strain conditions of shock loading. The local probing of the free surface of targets by sing interf rometric chnique allows to determi ing the criterion f r i itial stage of b ittle damag in the form h eshold value of local str ss. This stress corre pon s o appearanc of horizontal step at the front of compressive pulse which evidences the nucleation of local source of damage. © 2016 The Authors. Published by Elsevier B.V. Peer-review under r sponsibility of the Scientific Committee of ECF21. Keywords: shock tests, brittle materials, localized damage, dynamic compression, spall strength . 1. Intro uction The initial dynamic fracture is an important stage of deformation process which defines the macroscopic strength of material. Nucleation and development of initial sources of damage is closely associated with the structural instabilities of dyn mic deformation process. I their scale, the structural instabilities belong to mesoscale, which supposes that experi ental study of respon e of mate ial on shock loading should be carried out at the mesoscale as well. In the pr sent work, the results of studying the dynamic fracture of brittle materials, namely, gabbro-diabase, gray iron and fused qua tz ar presented. The goal of rese rch was a d termination of the criterions for nucleation of localized truct ral instabiliti s as sources of initial stag of dynamic fract re of brittle materials. 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.: +7-931-339-8590. E-mail address: ym38@mail.ru * Corresponding author. Tel.: +7-931-339-8590. E-mail address: ym38@mail.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review un r responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility 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.2016.06.062