PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1632–1637 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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 Molecular-dynamic investigation of the initial failure of the crystal structu at the ext rnal cyclic uniaxi l extensi n Igor Golovnev a , Elena Golovneva a * a Kristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk 630090, Russia , Andrey Utkin a Abstract The paper deals with the molecular-dynamic simulation of the cyclic uniaxial tension of a nano-sized rod. The external action is described as follows: ( ) 0 sin X V V t ω = . The criterion of the damage beginning (beginning of the crystal structure failure) has been found: there is the critical value of the atomic plane dispersion; as it is exceeded, irreversible changes occur in the nano-sized rod crystal structure. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: nano-sized rod, cyclic loading, failure of crystal structure, dam g accumulation, fracture, atomic plane dispersion, molecular dynami s simulation; 1. Introduction This work is addressed to solve the fundamental problem of the analysis of the atomic-level fracture of a nanostructure und r the cyclic loading, and to find the criterion which would characterize suc a system state which can be deem d as the beginning of the rreversible failure of the crystal structure leading to further fracture. To solve the problem, the processes in the nanosystem are numerically analyzed under the cyclic uniaxial tension by means of the molecular dynamics method. Under study were the processes in the crystal structure generated by the action of the external harmonic uniaxial tension, described by the expression ( ) 0 sin X V V t ω = . ECF22 - Loading and Environmental effects on Structural Integrity Molecular-dynamic investigation of the initial failure of the crystal structure at the external cyclic uniaxial extension Igor Golovnev a , Elena Golovneva a * a Kristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk 630090, Russia , Andrey Utkin a Abstract The paper deals with the molecular-dynami simulation of the cyclic uniaxial tension of a nano-sized rod. The external action is des ribed as follows: ( ) 0 sin X V V t ω = . The criterion of the damage beginning (beginning of the crystal structure failure) has been found: there is the critical value of the atomic plane dispersion; as it is exceeded, irreversible changes occur in the nano-sized rod crystal structure. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: nano-sized rod, cyclic loadi g, failure of crystal structure, amage accumulation, fracture, atomic plane dispersion, molecular dynamics simulation; 1. Introduction This work is addressed to solve the fundamental problem of the analysis of the atomic-level fracture of a nan structure nder the cyclic loading, and to find th criterion which woul characterize such a system state which can be dee ed as the beginning of the irreversible failure of the crystal structure leading to further fracture. To solve the problem, the processes in the nanosystem are numerically analyzed under the cyclic uniaxial tension by means of the mol cular dynamics method. Under study were the processes in the crystal structure generated by the action of the external harmonic uniaxial tension, described by the expression ( ) 0 sin X V V t ω = . © 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.: +7-913-938-33-76; fax: +7-383-330-72-68. E-mail address: elena@itam.nsc.ru * Corresponding author. Tel.: +7-913-938-33-76; fax: +7-383-330-72-68. E-mail address: elena@itam.nsc.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.2018.12.343