PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 6 (2017) 265–268 Available online at www.sciencedirect.com ScienceDirect StructuralI tegrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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. ublishe by E sevier B.V. Peer-review und responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) On the temporal peculiarities of stabilization effect under cyclic deformation for steel Yu.V. Petrov a,b , N.S. Selyutina a,b, * a Saint Petersburg State University, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dynamics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract New phenomenological model of accumulation of plastic deformation under repeated cyclic loading for metals based on a notion of the characteristic time as a m terial prop rty is proposed. Inc porati n of the temporal par meter into deformation law allows one to predict the adaptability effect of material at a low-cycle loading, which is defined by the stabilization process of accumulated plastic deformation after multiple loading cycles. Some of the known experimental data for the quenched steel-50 with the observed adaptability effect on the basis of the proposed model are analyzed. Obtained values of the characteristic time for each of the steel grades differ essentially depending on the way of treatment. It is shown that the parameter of temporal sensitiveness of material, presented in the relaxation model of plasticity, can serve as an effective tool for description the stabilization phenomenon and reflection the technological actions towards material. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: incubation time, cyclic loading, steel 1. Introduction The expansion of region of load capacities related to the stabilization deformation phenomenon of elastic-plastic materials under low-cycle loading is a crucial task of engineering analysis. Conventional adaptability theory coupled with numerical methods gives a good correspondence with experimental data for very limited series of experiments. XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) On the temporal peculiarities of stabilization effect under cyclic deformation for steel Yu.V. Petrov a,b , N.S. Selyutina a,b, * a Saint Pete sburg S ate U iversity, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dynamics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract New phenomenological model of accumulation of plastic eformation under repeated cyclic loading for metals b sed on a notion f the characteristic time as a material property is proposed. In orporation of the temporal parameter into deformation law allows one to pr ict the adaptability eff ct of material at a low-cycle loading, which is defined by the stabilization proc ss of accumulated plastic deformation after multiple loading cycles. So e of th k own experimental data f r t quench d steel-50 with the observed adapt bility effect on the basis of the pr posed model are nalyzed. Obtained values of the characteristic time for each of the steel grades differ essentially depending on the way of treatment. It is shown that the parameter of temporal sensitiveness of material, pres nted i t e relaxation model of plasticity, can serve as an effective tool for description the stabilization phenomenon and reflection the technological actions towards material. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: incubation time, cyclic loading, steel 1. Introduction The xpansion of region of l ad capaci es related o the stabilization deformation phenomenon of elastic-plastic materials under low-cycle loading is a crucial task of engineering analysis. Conventional adaptability theory coupled with numerical methods gives a good correspondence with experimental data for very limited series of experiments. © 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. E-mail address: nina.selutina@gmail.com * Correspon ing author. E-mail address: nina.selutina@gmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 201 7 The 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.

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.2017.11.040