PSI- Issue 9

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 9 (2018) 207–214 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Gruppo Italiano Frattura (IGF) ExCo. IGF Workshop “Fracture and Structural Integrity” Experimental and Theoretical Study of Deformation Processes in a Flange Connection of Iron Beams I.Shardakov a *, A.Shestakov a , I.Glot a a Institute of Continuous Media Mechanics UB RAS, 1, Korolev street, Perm, 614013, Russia Abstract Flange connections are the critical elements of metal structures, as they determine the whole structure rigidity and strength. In this paper, we present the results of experimental and theoretical studies performed to evaluate the deformation behavior of the elements of metal beam-to-column flange connections. The experimental investigations were carried out on samples subjected to elastic and inelastic deformations up to their full failure. Displacements at the ch racteristic points of the samples were registered during the loading process. Relative deformations were measured at the points of greatest stress and strain concentration. The data obtained at different scales accurately characterize the interrelations between the deformed elements, especially when the deformation becomes inelastic. Our theoretical studies were concerned with the development of a mathematical model capable of providing an adequate description of elastic and inelastic stress-strain states in the elements of flange connections. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: flange connection; failure; load-carrying capacity; monitoring; simulation; experiment 1. Introduction Flange connections are used as an alternative to welding because they can be easily disassembled for shipping, routine insp ction, maintenance, or r placement. There have been numerous studies considering the specific features of the deformation capacity of the elements of flange connections in various embodiments. It is known that flange column-to-beam connections can be realized in different ways, Ghindea and Ballok (2015). In the past decades, a IGF Workshop “Fracture and Structural Integrity” Experimental and Theoretical Study of Deformation Processes in a Flange Connection of Iron Beams I.Shardakov a *, A.Shestakov a , I.Glot a a Institute of Continuous Media Mechanics UB RAS, 1, Korolev street, Perm, 614013, Russia Abstract Flange conn ctions are the critical elements of metal structures, as they determin the whole structure rigidity and strength. In this paper, we present the results of xperimental and theor tical studies performed to evaluate the deformation behavior of th elements of metal b am-to-c lumn flange connections. The experimental investig tions were carried out on samples subjected to elastic and inelastic deformations up to their full failur . Displacements at the characteristic points of the samples were regist red during the loa ing process. Relative deformations w re measured at the points of great st str ss and strain con entration. The data obtained at diffe en scales accurately characterize the interrelations between the deformed elements, especially when the deformatio becomes inelastic. Our theoretical studies were concerned with the dev lopment of a mathematical model capable of providing an adequate description of elastic and inelastic stress-strain states in the elements of flange con ections. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Keywords: flange connection; failure; load-carrying capacity; monitoring; simulation; experi ent 1. Introduction Flange connections are used as an alternative to welding because they can be easily disassembled for shipping, routine inspection, maintenance, or replacement. There have been numerous studies considering the specific features of the deformation capacity of the elements of flange connections in various embodiments. It is known that flange column-to-beam connections can be realized in different ways, Ghindea and Ballok (2015). In the past decades, a © 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 * Correspon ing author. Tel.: +7-342-237-8318; fax: +7-342-237-8487 E-mail address: shardakov@icmm.ru

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.2018.06.032 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th 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.