PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1221–1228 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

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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. © 2017 The Authors. Published y Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Risk-based planning of assessment actions for fatigue life prediction John Leander a, 0 F *, Daniel Honfi b , Ívar Björnsson c a KTH Royal Institute of Technology, Stockholm, Sweden b RISE Research institutes of Sweden, Gothenburg, Sweden c Lund University, Lund, Sweden Abstract It is vital to extend the service life of existing bridges as far as possible as a means for improved sustainability leading to reduced economic cost and r source onsumption. This requirement is especially valid for bridges which are critical component f highly vulnerable infrastructure systems. Achieving this aim requires enhanced methods involving various actions and methods influencing different aspects of the assessment process. A framework is presented in this paper based on three common factors used to describe the assessment actions of existing bridges; (i) model sophistication, (ii) uncertainty consideration, and (iii) knowledge content. The framework elucidates the influence of different decisions on the assessment process and facilitates the planning of appropriate assessment actions. Furthermore, it provides a basic scheme for a risk-based decision analysis for determining suitable assessment actions or activities. A fatigue assessment of an existing bridge detail is used to demonstrate the application of the framework in practical cases. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Fatigue; Steel Bridges; Reliablity; Risk; Assessment 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Risk-based planning of assessment actions for fatigue life prediction John Leander a, 0 F *, Daniel Honfi b , Ívar Björnsson c a KTH Roy l Institute of Technology, Stockholm, Sweden b RISE Research institutes of Sweden, Goth burg, Sweden c Lund University, Lund, Sweden Abstract It is vital to extend the service life of existing bridges as far as possible as a means for improved sustainability leading t r duced economic cost and resour e consumption. This requirement is especially valid for bridges which are critical components of highly vulnerable i frastructure systems. Achieving this aim requires enhanc d methods involving vari us actions and methods influencing diff rent aspects of the assessment process. A framework is presented in this paper based on three common factors used to d s rib the assess nt actions of existing bridg s; (i) model sophistication, (ii) uncertainty consideration, and (iii) knowledge content. Th framework elucidates the influence of differ nt decisions on the assessment process and facilitates the planning of appropriate assessment a tions. Furthermore, it provides a basic schem for a risk-based decision analysis f r determini g suitable assessme t actions or activities. A fatigue assessment of an existing bridge detail is used to demonstrate the application of the framework in practical cases. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Fatigue; Steel Bridges; Reliablity; Risk; Assessment © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Bridges are crucial parts of every infrastructure system and their functionality must be maintained to secure important communication routes. This will become an increasing challenge for most countries with a developed Bridges are crucial parts of every infrastructure system and their functionality must be maintained to secure important communication routes. This will become an increasing challenge for most countries with a developed Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction 1. Introduction

* Corresponding author. Tel.: +46 76 134 1430. E-mail address: john.leander@byv.kth.se * Correspon ing aut or. Tel.: +46 76 134 1430. E-mail address: john.leander@byv.kth.se

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.047 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.