PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 377–384 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 Life Extension of Welded Structures Using HFMI Techniques - Potential Application to Offshore Structures Fikri Bashar Yalchiner a , Zuheir Barsoum a,b a NPCC - National Petroleum Construction Company, Musaffah Industrial Zone, 2058 Abu Dhabi, UAE b KTH Royal Institute of Technology, Teknikringen 8, 100 44 Stockholm, Sweden Fatigue damage development in welded structures is a local phenomenon and if one need to achieve an extension of the life for the structure local post weld improvements need to be use in order to reduce/remove local features which contribute to the fatigue damage. In order to enh ce the life time of load carrying welded structures without large am unt of cost investments, e.g. redesig and r pl cement of existing structures, post weld improvement techniques need to be more applied. New High Freque cy Mechanical Impact (HFMI) technologies have been developed in the last 10 year which nables cost-eff ctive life extension and reparation f welded tructures. Th use improvement techniques for technical life enhancement upgrad and repair of welded structures within various industries, e.g. oil and gas, have been an accepted practice. HFMI treatment techniques are based on localized peening process of the welded joints and the devices are portable. The impacting results in a local cold plastic deformation which remove weld defects reduce stress concentration and induce compressive residual stresses which eventually will enhance the fatigue life of the welded structure. An overview of existing improvement techniques for welded structures is given followed by description of new technologies (HFMI). A brief description of the new international guideline and design recommendations within the International Institute of Welding (IIW) is given. Several validation studies on the fatigue performance of HFMI techniques are presented and onsite potential applications of the techniques for joints in fixed offshore structures are outlined. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Life Extension of Welded Structures Using HFMI Techniques - Pote tial Application to Offshore Structur s Fikri Bashar Yalchiner a , Zuheir Barsoum a,b a NPCC - National Petroleum Construction Company, Musaffah Industrial Zone, 2058 Abu Dhabi, UAE b KTH Royal Institute of Techn logy, Teknikri gen 8, 100 44 Stockholm, Sweden Abstract Fatigue damage development in welded structures is a local phenomenon and if one need to achieve an extension of the life for the structure local post eld improvements need to be use in order to reduce/remove local features which contribute to the fatigue damage. In ord r to enhance the life time of load c rrying w lded structures without l rge amount of cost investments, e.g. redesign and r placement f existing s ructures, post weld imp ov ment techniques n ed to be more appli d. New High Frequency Mechanical Impact (HFMI) technologies have been d veloped in t last 10 years which enable cost-effective life ext nsion and rep r tion of w lded struct res. The us improvement techniques for technical lif e hancement upgrade and repair of welded structures wi hin various industrie , e.g. oil and gas, hav been an ccepted p actice. HFMI treatment t hniques are based o localized peening process of th weld d joints and th devi es are portable. The impacti g results in a local col plastic deformation which remove wel defects reduce stress concentration and induc compressive residu l stresses which ev ntually wi l enhance the fatigue life of the elded structure. An overview of existing improveme t techniques for welde structures is given followed by description of new technologies (HFMI). A brief description of the n w international guidel ne and design recommenda ions within the International Instit t of Welding (IIW) is given. Several validation studies on the fatigue performa ce of HFMI techniques are presented and onsite potential applications f the t chniques for j ints in fixed offshore structures are outli ed. Keyw ds: Life extension, HFMI (High Frequency Mechanical Impact), Welded Structure, Fatigue; © 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. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

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.2017.07.185 2452-3216 © 2017 The 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. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt * Corresponding author. Tel.: +971559151475; fax: +97125549111. E-mail address: fikrib@npcc.ae * Corresponding author. Tel.: +971559151475; fax: +97125549111. E-mail address: fikrib@npcc.ae Keywords: Life extension, HFMI (High Frequency Mechanical Impact), Welded Structure, Fatigue;