PSI - Issue 5

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 5 (2017) 959–966 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Compatibility of S-N and crack growth curves in the fatigue reliability assessment of a welded steel joint Bahman Hashemi a, 0F0F0F * , Johan Maljaars a,b , Davide Leonetti a , H.H (Bert) Snijder a a Eindhoven University of Technology, Department of the Built Environment, P.O Box 513, 5600MB, Eindhoven, The Netherlands b TNO, Delft, The Netherlands Abstract Reliability analysis is a crucial phase in assessing the safety status of new and existing structures. One of its applications is to predict the fatigue life of fatigue prone details. Two models are used to formulate the fatigue limit state: S-N curves in combination with Palmgren-Miner damage accumulation rule and linear elastic fracture mechanics using fatigue crack growth rate curves. Within each model, choices must be made on the values of the variables and these choices are sometimes different in different standards. This study investigates the consistency between the standards by determining the failure probability of the different models and values for a transverse butt weld joint under Variable Amplitude Loading. Partial factors required for the design are then derived as a function of the required reliability for each model and associated values. The influence of the uncertainties related to each involved variable is evaluated by performing a sensitivity a alysis. © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of ICSI 2017. Keywords: Fatigue reli bility assessment; Prob bilistic method; S-N curves; Linear Elastic Fracture Mechanics; Partial Fac ors Fatigue is a dominant failure mode for structures such as bridges subjected to time varying loading. Several empirical or semi-analytical fatigue resistance models have been developed since the19 th century. Among them, the most common ones used to assess welded details are the nominal stress-life (S-N) and fatigue fracture mechanics 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Compatibility of S-N and crack growth curves in the fatigue reliability assessment of a welded steel joint Bahman Hashemi a, 0F0F0F * , Johan Maljaars a,b , Davide Leonetti a , H.H (Bert) Snijder a a Eindhoven University of Technology, Department of the Built Environment, P.O Box 513, 5600MB, Eindhoven, The Netherlands b TNO, Delft, The Netherlands Abstract R liability analysis is a crucial has in ssessing the safety status f new and existin structures. One of its appli ations is to predict the fatigue life of fati ue prone details. Two models re used to formulate t e fatig e limit state: S-N curves in combination with Palmgren-Miner damage accumul tion rule and linear elastic fracture mechanics using fatigu crack growth rate curv s. Within each model, choices must be made on the values of the v riable and th se choices are sometimes different in standards. This study investigates the consistency between the standards by determining the f ilure probability of the different models and values for a transverse butt w ld joint und r Variable Amplitude Loading. Partial actors required for the d sign are hen derived as a function of the required reliability for each model and as ociated values. The influence of the uncertainties related to each involved variable is evaluated by performing a sensitivity analysis. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: F tigue reliability assessmen ; Probabili ic method; S-N curves; Lin ar Elastic Fracture Mechanics; Partial Factors 1. Introduction Fatigue is a dominant failure mode for structures such as bridges subjected to time varying loading. Several empirical or semi-analytical fatigue resistance models have been developed since the19 th century. Among them, the most common ones used to assess welded details are the nominal stress-life (S-N) and fatigue fracture mechanics © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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. 1. Introduction

* Corresponding author. Tel.: +390402472948; E-mail address: s.b.hashemi@tue.nl * Correspon ing author. Tel.: +390402472948; E-mail address: s.b.hashemi@tue.nl

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.2017.07.134 * 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.