PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 988–993 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 ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Simulation of Fatigue Fracture of FeMn-based Shape Memory Alloys at Cyclic Mechanical Tests Fedor S. Belyaev a *, Margarita E. Evard a , Aleksandr E. Volkov a a Saint Petersburg State University, Saint Petersburg,199034, Russian Federation Abstract In this microstructural simulation of the mechanical behavior of FeMn-based shape memory alloy samples at mechanical cycling the threefold symmetry of the close-packed planes {111} of the austenitic fcc phase and basic planes {0001} of the martensitic hcp structure and the multi-variance of the reverse martensitic transformation are taken into account. Damage accumulation and resulting fatigu fracture are descr bed i th terms of the internal variables associated with a d mage variable and the densitie f the oriented and scattered deformation defects. A deformation-and-stress criterion of fracture is proposed. It takes into consideration the effect of hydrostatic pressure, deformation defects and material damage. It is shown that the approach is suitable for describing the fatigue fracture of iron-based shape memory alloys at cyclic mechanical loading. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: FeMn, FeMnSi, shape memory, plasticity, defects, fatigue, fracture criterion. 1. Introduction Iron-based shap memory alloys (SMA), such as FeMn-based compositions known since 1970s containing about 17 – 18 %Mn and novel FeMnSi-based alloys, are of great interest of researchers and engineers in connection with their possible applications in various seismic vibration control and seismically isolated structures (Sawaguchi et al. (2006, 2015) Nikulin et al (2015, 2016), Ghafoori et al. (2017)). One of the main required characteristics of such structures is a good low-cycle loading life because a large magnitude earthquake can be followed by large aftershocks (Nikulin et al., 2016). ECF22 - Loading and Environmental effects on Structural Integrity Simulation of Fatigue Fracture of FeMn-based Shape Memory Alloys at Cyclic Mechanical Tests Fedor S. Belyaev a *, Margarita E. Evard a , Aleksandr E. Volkov a a Saint Petersburg State University, Saint Petersburg,199034, Russian Federation Abstract In this microstructural simulation of the mechanical behavior of FeMn-based shape memory alloy samples at mechanical cy ling the threefold symmetry of the close-packed planes {111} of the austenitic fcc phase and basic planes {0001} of the martensitic hcp structure and the multi-variance of the reverse martensitic transformation are taken into account. Damage accumulation and resulting fatigue fr cture are described in the terms of the internal variables associated with a damage variable and the densities of t ori nted and scattered deformation defects. A deformation-and-stress criterion of fracture is proposed. It takes into consideration t effect of hydrostatic pressure, deformation defects and material damage. It is shown that the approach is suitable for describing the fatigue fracture of iron-based shape memory alloys at cyclic mechanical loading. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: FeMn, FeMnSi, shape memory, plasticity, defects, fatigue, fracture criterion. 1. Introduction Iron-b sed shape memory alloys (SMA), such as FeMn-based compositions known since 1970s containing about 17 – 18 %Mn and novel FeMnSi-based alloys, are of great interest of researchers and engineers in connection with their possible applications in various seismic vibration control and seismically isolated structures (Sawaguchi et al. (2006, 2015) Nikulin et al (2015, 2016), Ghafoori et al. (2017)). One of the main required characteristics of such structures is a good low-cycle loading life because a large magnitude earthquake can be followed by large aftershocks (Nikulin et al., 2016). © 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.: +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 ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. * Correspon ing author. Tel.: +7-812-428-4220; fax: +7-812-428-7079. E-mail address: f.belyaev@spbu.ru * Corresponding author. Tel.: +7-812-428-4220; fax: +7-812-428-7079. E-mail address: f.belyaev@spbu.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 ECF22 organizers. 10.1016/j.prostr.2018.12.184