PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 613–618 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 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 th ECF22 rganizers. ECF22 - Loading and Environmental Effects on Structural Integrity Dynamic interfacial fracture of a thin-layered structure Tianyu Chen a , Christopher M. Harvey a , Simon Wang a,c , Vadim V. Silberschmidt b 0F0F0F * a Department of Aeronautical and Automotive Engineering, Loughborough University, Lecestershire LE11 3TU, UK b Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire LE11 3TU, UK c School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China Abstract To calculate the dynamic energy release rate of a crack is important for understanding a structure’s fracture behavior under transient or varying loads, such as impact and cyclic loads, when the inertial effect can be significant. In this work, a method is proposed to derive an analytic expression for the dynamic energy release rate of a stationary crack under general applied displacement. An asymmetric double cantilever beam with one very thin layer is considered as a special case, with vibration superimposed onto a constant displacement rate applied to the free end. The resulting expression for dynamic energy release rate is verified using the finite-element method (FEM) in conjunction with the virtual crack closure technique. The mode-mixity of the dynamic energy release rate is also calculated. The predicted total dynamic energy release rate and its components, G I and G II , are both in close agreement with results from FEM simulations. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: dynamic energy release rate, inertial effect, modal analysis, dynamic energy release rate partition 1. Introduction Dynamic fracture has been an active research topic for several decades. During this time, various physical quantities ave been der ved as dir ct counterparts to those from quasi-static fracture, such as dynamic stress intensity factor and dynamic energy release rate. It is important to be able to calculate these quantities to understand the fracture behavior of a structure under transient or varying loads. In some engineering applications, loading can ECF22 - Loading and Environmental Effects on Structural Integrity Dynamic interfacial fracture of a thin-layered structure Tianyu Chen a , Christopher M. Harvey a , Simon Wang a,c , Vadim V. Silberschmidt b 0F0F0F * a Department of Aeronautical and Automotive Engineering, Loughborough University, Lecestershire LE11 3TU, UK b Wolfson School of Mechanical, Electrical and Manufacturi g E ineering, L borough Univ rsity, Le c stershire LE11 3TU, UK c Scho l of Mechanical and Equipment Engineering, Heb i U iversity of Engineering, Handan 056038, China Abstract To calculate the dynamic energy release rate of a crack is important for understanding a structure’s fracture behavior under transient or varying loads, such as impact and cyclic loads, when the inertial effect can be significant. In this work, a method is proposed to derive an analytic expression for the dynamic energy release rate of a statio ary crack under general applied dis lac ment. An asymmetric double cantil ver b am with one very thin layer is considered as a spe ial case, with vibration superimposed onto a constant displaceme t rat applied to the free end. The resulting expr ssion for dynamic energy release rate is v rified using the finite-element method (FEM) in conjunction with the virt al crack clo ure technique. The mode-mixity of the dynamic e ergy release rate is also calculated. The predicted total dynamic energy release rate and its components, G I and G II , are both in close agreement with results from FEM simulations. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: dynamic energy release rate, inertial effect, modal analysis, dynamic energy release rate partition 1. Introduction Dynamic fracture has been an active research topic for several decades. During this time, various physical quantities have been derived as direct counterparts to th se from quasi-static fracture, such as dynamic stress inte sity factor and dynamic energy release rat . It is important to be able to calculate these quantities to understand the fracture behavior of a structure under transient or varying loads. In some engineering applications, loa ing can © 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.: +44(0)1509-227504. E-mail address: v.silberschmidt@lboro.ac.uk * Corresponding author. Tel.: +44(0)1509-227504. E-mail ad ress: v.silberschmidt@lboro.ac.uk

2452-3216 © 2018 The 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 r sponsibility of the ECF22 organizers.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt

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.2018.12.101