PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 9 (2018) 215–22 Available onlin at www.sci n edirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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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. © 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” Analysis of Elastic Wave Parameters in the Elements of the "Striker – Gasket – Reinforced Concrete Beam" System K. Sobianin a , I. Shardakov a *, A. Shestakov a , I. Glot a a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, N614013, Russian Federation Abstract Application of automated monitoring systems ensures the deformation safety of structures. Such deformation control systems are supplemented with the tools, which allow evaluation of the criticality of the structure state on the basis of vibration measurements. These are acoustic emission registration systems and shock wave diagnostics systems. The results obtained in this study are directly related to the shock-wave vibrodiagnostics of reinforced concrete structures. Particular attention is given to vibrodiagnostics in a "spare mode", which causes no inelastic deformation to appear in the elements of the examined structure. The objective of this work is to find local impact parameters for excitation of mechanical oscillations of a desired spectrum in the structure and to excite an elastic wave with required wavefront characteristics. One of the main impact parameters determining these characteristics is the pulse duration. Based on the results of the numerical experiment performed on the basis of a mathematical model of dynamic elastic interaction of the elements of the "striker – gasket – reinforced concrete beam" system, the duration of the impulse action on the beam was determined depending on various factors. Thus, within a specified range of these factors the greatest interval of impulse duration is obtained under variation of the striker velocity within the interval from 0.1 ms to 3 ms. Assuming that the impulse duration defines one of the main wave frequencies of vibrations one may conclude that frequencies will vary in the range from 300Hz to 10000Hz. © 2018 The Authors. Published by Elsevi r B.V. Peer-review und r responsibil ty of the Gruppo Italia o Frattura (IGF) ExCo. IGF Workshop “Fracture nd Structural I tegrity” Analysis of Elastic Wave Parameters in the Elements of the "Striker – Gasket – Reinforced Concrete Beam" System K. Sobianin a , I. Shardakov a *, A. Shestakov a , I. Glot a a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, N614013, Russian Federation Abstract Application of automated monitoring syst ms ensur s the d formation safety of structures. Such deformati control systems are supplem ted with the tools, which allow evalu tion of the criti lity of th structure state on the basis of vibration measurements. These ar acoustic emission registration systems and shock wave diagnostics systems. results obtained in this study are directly related to the shock-wave vibrodiagnostics f reinf rced concret structures. Particula attention is giv n to vibrodi gnostics in a "spare mo e", which causes no inelastic deformation to appear in the ele ent of the examined structure. The objective of this work is to find local impact param ters for excitation of mechanical oscillations of a desired spectru in the structure and to excite a elastic wave with r quired wav front char cteri tics. One of the main impact pa ameters determining these characteristics is the pulse duration. Based on the results of the numerical experiment performed on the basis of a mathe atical model of dynamic elastic interaction of the elements of the "striker – gask t – reinforced c ncrete beam" system, th duration of the impuls action on the beam was determined depending on various factors. Thus, within a specified range of these factors the greatest interval of impulse duration is obtained under variation of the striker velocity within the interval from 0.1 ms to 3 ms. Assuming that the impulse duration defines one of the main wave frequencies of vibrations one may conclude that frequencies will vary in the range from 300Hz to 10000Hz.

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.2018.06.033 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The 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. * Corresponding author. E-mail address: sobyanin.k@icmm.ru (K.V. Sobyanin), shardakov@icmm.ru (I.N. Shardakov) * Corresponding author. E-mail address: sobyanin.k@icmm.ru (K.V. Sobyanin), shardakov@icmm.ru (I.N. Shardakov) © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: concrete; vibration diagnostics; shock-wave method; elastisity Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: concrete; vibration diagnostics; shock-wave method; elastisity