PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 33 –335 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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. Copyright © 2017 The Authors. Published by El evier B.V. Peer-review und r responsibility of the MCM 2017 organ z rs. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Numerical simulations of Taylor anvil-on-rod impact tests using classical and new approaches Grigori Volkov a , Elijah Borodin b , Vladimir Bratov c * a Saint-Petersburg State University, Universitetskaya Naberezhnaya 7/9, Saint-Petersburg 199034, Russia b Department of Physics, Institute of Natural Sciences, Ural Federal University, 620002 Mira str., 19, Ekaterinburg, Russia c Institute of Problems of Mechanical Engineering RAS, 199178 V.O., Bolshoj pr., 61, Staint-Petersburg Russia Abstract Plastic deformation of samples undergoing Taylor anvil-on-rod impact test is simulated utilising finite element method (FEM). Classical (bilinear plasticity using von Mises stress, Johnson-Cook plasticity model) plasticity models and a new plasticity model based on notion of incubation time of plastic flow initiation are employed to model dynamic deformation of tested samples. In order to verify the obtained solutions, the received predictions are compared to available experimental measurements of deformed sample shapes for two different materials (copper, aluminium) and various initial sample velocities. It is shown that bilinear von Mises plas icity model is not able to provid satisfactory coincidence between the shape of the sample boundary received n numeri al simulations and in real experimental conditions. At the same time, mod ls ccounting for rate dependency of deformation are providing much more accurate results. Substitution of the concept of "dynamic" yielding stress of a material, depending n the rate of deformation by characteristic time of plastic stress relaxation provides a powerful tool for robust prediction of plastic deformation for a wide range of strain rates. The parameter of the characteristic relaxation time has a clear physical interpretation and theoretically can be evaluated from microstructural studies. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Numerical simulati ns of Taylor anvil-on-rod impact tests using classical and new approaches Grigori Volkov a , Elijah Borodin b , Vladimir Bratov c * a Saint-Petersburg St te Univ ity, Universitetskay Naberezhnaya 7/9, ai t-Petersburg 199034, Rus a b Department of Physics, In titute of Natural Scie ces, Ural Federal University, 620002 Mira str., 19, Ekate inb rg, Russia c Ins itute of Problems of M chanical Engineering RAS, 199178 V.O., Bolshoj pr., 61, Staint-Petersburg Russia Abstract Pl tic deformation of samples undergoing Taylor anvil- -rod im act test is simulated utilising finite elem nt method (FEM). Classical (bil near plasticity using von Mises stress, Johns -Cook plasticity model) plasticity models nd a new plasticity model bas d n notion of incubation time of plastic flow init a are employe t model dynamic d formation of tested samples. In order to verify the obtained solutions, the receiv d predictions are compared to avail ble xperimental measurements of defo med sample shapes for two different mater als (copper, aluminium) an various initial sampl velociti s. It is show th bilinear vo Mises pl sticity m del i not ble to provide sati factory coinc dence b tween the hape of the sampl boundary r ceived i numerical simulations and in real xperimental cond tions. At he sa e tim , models accou ting for rate depen ncy of deformation are providing much more accurate results. Substitution of the concept of "dynamic" yielding stress f a material, depending on the rate of deformation by characteristic time of plastic stress relaxation provides a powerful tool for robust prediction of plastic deformation for a wide range of strain rates. The parameter of the characteristic relaxation time has a clear physical interpretation and theoretically can be evaluated from microstructural studies. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Taylor test; FEM; incubation time; copper; aluminium; Keywords: Taylor test; FEM; incubation time; copper; aluminium;

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 © 201 7 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 201 7 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. * Correspon ing author. Tel.: +7-950-021-7203; fax: +7-812-321-4779. E-mail address: vladimir@bratov.com * Corresponding author. Tel.: +7-950-021-7203; fax: +7-812-321-4779. E-mail address: vladimir@bratov.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.050