PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 21 –216 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Crack control in concrete using shock wave techniques Igor Shardakov a *, Anton Bykov b , Aleksey Shestakov a , Irina Glot a a Institute of Continuous Media Mechanics UB RAS, 1, Korolev str., Perm, Russia, 614013 b Perm National Research Polytechnic University This paper focuses on further development of the non-destructive shock wave method used in structural engineering to control the state of rei forced concrete (RC) structures subjected to loading, which frequently leads the formation of cracks in these structures. Our version of this method implies registration of wave processes occurred in concrete due to impact loading and comparison of these processes for undamaged and cracked structures. The parameters of elastic shock waves are recorded at instants when they are practically independent of fastening conditions and responded best to the presence of a crack. Numerical simulations provide a means of analyzing parameter changes in the wave front passing through the region of cracking. A qualitative criterion is formulated to assess whether the examined concrete is undamaged or there are cracks in it and how the structure condition chang s at in reased load and during the elimination of cracks. This criteri n is defined as the ratio of acceleration amplitudes of first half-waves registered in areas on both sides of the crack. A co parison of computational results and experimental ata supports the validity of th criterion. Analysis of the sults obtained from a series of numerical experiments makes it possible to compute optimal points for applying impulse loading and to determine sensor positions for recording accelerations needed to compute the criterion. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Crack control i concrete using shock wave techniques Igor Shardakov a *, Anton Bykov b , Aleksey Shestakov a , Irina Glot a a Institute of Continuous Medi Mechanics UB RAS, 1, Korolev st ., Perm, Russia, 614013 b Perm National Research Polytechnic University Abstract This paper focuses on further development f the non-destructive shock wave method used in structural engineering to control the stat of reinforced concrete (RC) structures subjected to loading, which frequently lead the formation of cracks in these structures. Our version of this method implies registration of wave process s occurred in conc ete due to impact loading and comparison of these processes for undamaged and cracked structures. The parameters of elastic shock waves are recorded at instants when they are practically independent fastening conditions and r spo ded best to the presence of a crack. Numerical simulations provide a m ans of analyzing parameter changes in the wav front passing through the region of cracking. A qualitative criterion is f rmulated to assess whether the examined concrete is undamaged or there are racks in it and how the structure condition changes at increased load and during the elimi ation of cracks. This crite ion is defined as the ratio ac eler ti n amplitudes of first half-waves reg stered in areas n both sides of the c ack. A comparison f co putati nal results nd experimental data su ports the validity of t criteri n. Analysis of the result obt ined from a series of numerical experiments makes it possible to compute optimal points for applying impulse loading and to determine sensor positions for recording accelerations needed to compute the criterion. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Author . Published by Elsevie B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Vibrodiagnostics; Cracks in reinforced concrete; Math modeling; Wave processes Keywords: Vibrodiagnostics; Cracks in reinforced concrete; Math modeling; Wave processes

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  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.114 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing 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 address: shardakov@icmm.ru