PSI - Issue 13

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 Structural Integrity 13 (2018) 1342–1346 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Elastic and Dissipative Properties of Concrete under Impact Loads I. Shardakov a *, A. Shestakov a , I. Glot a a Institute of continuous Media Mechanics UB RAS, 1, Korolev Street, Perm, 614613, Russia Abstract One of the most promising approaches for the diagnostic of reinforced concrete structures is vibration diagnostics which analyze natural vibrations and transient processes caused by imp ct loads. It concentr tes on the evolution of the shock wave front passing through the structure. The results of measurements are analyzed based on mathematical simulation of the propagation of deformation wave in space and time. The presence of a defect in the structure causes changes in the shape, frequency composition and propagation time of the wave. The mathematical model is also us d for determining the main parameters of experimental measurements: frequency range, actuator power and sensor sensitivity and their number and spatial location. A theoretical and experimental approach is proposed to determine elastic nd dissipative character stics of concrete. In the framework of viscoelastic model, the deformation response of concrete specimen to an impact load is analyzed. The numerical s lution is obtained by the finite-element method using the ANSYS software. Based on this solution, structural scheme of experiments has been obtained. In experiments free vibrations of the specimen were excited. The deformation response was recorded with a laser vibrometer. A special iterative procedure ensuring the agreement between numerical and experimental results was developed. The proposed approach provides a high sensitivity of the vibrodiagnostic procedure to the appearance and development of defects in concrete structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Concrete, elastic and dissipative characteristics, vibrations, experiment and simularuin 1. Introduction Mathematical modeling of wave propagation processes in concrete structures is an essential part of vibration diagnostics. The accuracy of mathematical model determined by the precision of elastic and dissipative characteristics of the model is crucial. The precision of mat rial characteristics is important for concrete since its characteristics may vary significantly. These properties can be obtained either based on measurement of the velocity of elastic wave propagation, Ng and Veidt (2009), Lee et al (2017), ASTM C597/C597M-16 (2016), Bykov et al (2015), or detection of decaying ECF22 - Loading and Environmental effects on Structural Integrity Elastic and Dissipative Properties of Concrete under Impact Loads I. Sha dakov a *, A. Shestakov a , I. Glot a a Institute of continuous Media Mechanics UB RAS, 1, Korolev Street, Perm, 614613, Russia Abstract One of the most promising approaches for the diagnostic of reinforced concrete structures is vibration diagnostics which analyze natural vibrations and transient processes caused by impact loads. It concentrates on the evolution of the shock wave front passing through the structure. The results of mea urements are analyzed ba ed on mathematical simulation f pr pagation of deformation wave in pa e and time. The presence of a defect in the structure causes ch nges in the shape, frequency composition an pr pagation tim of the wave. The mathematical model is also used for determining the main parameters o xp rimental measurements: frequency range, actuator pow r and s sor sensitivity nd th ir number and s a ial lo ati n. A theoretical and experimental approach is proposed to de ermine elastic and dissipative char cteristics of concrete. In the framework of viscoelastic model, the deformation resp nse of a concr te specimen to a impact load is a alyzed. The n m rical solutio is obtained by th finite-element method using the ANSYS s ftwar . Based on this solution, structural scheme of experiments has been obtained. In experiments free vibrations of the specimen were excited. The deformation re ponse was r corded with a laser vibrometer. A special iterativ proc dure ensuring the agr ement betwe n numerical and experimental results was dev loped. The p oposed approach provid s high sensitivity of the vibrodiagnostic proc dure to the ppearanc and development of f cts in concrete structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: Concrete, elastic and dissipative characteristics, vibrations, experiment and simularuin 1. Introduction Mathematical modeling of wav propagat on processes in concrete structures is an essential part of vibration diagnostics. The accuracy of mathematical model determined by the precision of elastic and dissipative characteristics of the model is crucial. The precision of material characteristics is important for concrete since its characteristics may vary significantly. These properties can be obtained either based on measurement of the velocity of elastic wave propagation, Ng and Veidt (2009), Lee et al (2017), ASTM C597/C597M-16 (2016), Bykov et al (2015), or detection of decaying © 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.: +7-342-237-8318; fax: +7-342-237-8487. E-mail address: shardakov@icmm.ru * Corresponding author. Tel.: +7-342-237-8318; fax: +7-342-237-8487. E-mail ad ress: shardakov@icmm.ru

* 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 r sponsibility of the Gruppo Italiano Frattura (IGF) ExCo.

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 ECF22 organizers. 10.1016/j.prostr.2018.12.281