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) 199–206 Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect

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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 f the Gruppo Italiano Frattura (IGF) ExCo. IGF Workshop “Fracture and 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 Concrete structures during their service life are subjected to vibrations and impact loads in addition to static forces. Just these loads are more often responsible for their critical state. Mathematical simulation of the vibration and impact processes in concrete is based on the viscoelastic constitutive relations. Information for the correct and reliable evaluation of the parameters of these models can e obtained from the experiments where the character of testing load corresponds to the real operating conditions of the structure. In this paper a theoretical and experime tal approach s proposed to determi at elastic and dissipative characteristics of concrete. In the framework of viscoelastic model, the deformation response of concrete specimen to an impact load is analyzed. Based on the results of numerical experiments, a structural scheme of experiments has been obtained to determine the elastic and dissipative properties of concrete. A series of physical experiments was performed to study the deformation behavior of a concrete sample, which experienced free vibrations. The elastic and dissipative characteristics of the material were obtained by applying an iterative procedure ensuring the agreement between the results of experimental measurements and calculated data. Estimation of the dependence of the material properties on the vibration frequency was made. The proposed approach to determining the properties of concrete provides 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 IGF Workshop “Fracture and 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 Concrete structures during their servic life are subjected to vibrations and impact loads in addition to static forc s. Just these load are more often responsible for their critical state. Mathematical simulation of the vibration and impact processes in concrete is based on the viscoelastic constitutive relations. Information for the correct and reliable evaluation of the parameters of these models can be obtained from the experiments where the character of testing load correspon s to the real operating conditions of the structure. In thi paper a theo etical and experimental approac is proposed to determinat elastic and dissipative characteristics of concrete. In th framew rk of viscoelastic model, the deformation response of a concrete specimen to an impact load is analyzed. Based on the results of numerical xperiments, a structural scheme of xperiments has been obtained to determine the elastic and dissipativ propertie of concrete. A s ries of physical experiments was performed to st dy the deform tion behavior of a concrete sa pl , which xperi nced free vibration . The elastic and dissipative characteristics of the material were obtained by applying an iterative procedure ensuring the agreement between the results of experimental measurements and calculated data. Estimation of the dependence of the material properties on the vibration frequency was made. The proposed approach to determining the properties of concrete provides high sensitivity of the vibrodiagnostic procedure to the appearance and development of defects in concrete structures. © 2018 The Authors. Published by Elsevier B.V. P er-review under responsibility of th Gruppo Italiano Frattura (IGF) ExCo.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Concrete; elastic and dissipative characteristics; vibrations; experiment and simularuin

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

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.2018.06.031 * 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. Tel.: +7-342-237-8318; fax: +7-342-237-8487. E-mail address: s ardakov@icmm.ru * Corresponding author. Tel.: +7-342-237-8318; fax: +7-342-237-8487. E-mail address: shardakov@icmm.ru