PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 149–154 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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. ECF22 - Loading and Environmental effects on Structural Integrity Tensile and compression properties of variously arranged porous Ti-6Al-4V additively manufactured structures via SLM S.Raghavendra a *, A.Molinari a , V.Fontanari a , V.Luchin b , G.Zappini b , M.Benedetti a , F.Johansson c , J.Klarin c a Department of Industrial Engineering,University of Trento,Trento 38123,Italy b Eurocoating Spa, Pergine Valsugana, Trento 38057, Italy c Product Development and Materials Engineering,Jönköping University, Jönköping 55318, Sweden Abstract Additively manufactured porous structures find increasing applications in the biomedical context to produce orthopedic prosthesis and devices. In comparison with traditional bulk metallic implants, they permit to tailor the stiffness of the prosthesis to that of the surrounding bony tissues, thus limiting the onset of stress shielding and resulting implant looseni ng, and to favor the bone in-growth through the interconnected pores. Mechanical and biological properties of these structures are strongly influenced by the size and spatial arrangement of pores and struts. In the present work irregular and regular cellular as well as fully random porous structures are investigated through tensile and compression uniaxial tests. Specific point of novelty of this wo k is that, beside cl ssical compressive tests, which are standa d characterization methods for porous/ cellular materials, tensile tests are carried out. Mechanical tes s are complemented with morphological analysis and porosity measurements. An attempt is mad to find correlations betw n cell arrangements, poro ity and mechanical pr p rties. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Cellular structures; porosity; Strength © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Tensile and compression properties of variously arranged porous Ti-6Al-4V additively manufactured structures via SLM S.Raghavendra a *, A.Molinari a , V.Fontanari a , V.Luchin b , G.Zappini b , M.Benedetti a , F.Johansson c , J.Klarin c a Department of Industrial Engineering,University of Trento,Trento 38123,Italy b Eurocoating Spa, Pergine Valsugana, Trento 38057, Italy c Product Development and Materials Engineering,Jönköping U iversity, Jönköping 55318, Sweden Abstract Additively manufactured porous structures find increasing applications in the biomedical context to produce orthopedic prosthesis and devices. In c mparison with traditional bulk metallic implants, they permit to tailor the stiffness of the t i to that of the surrounding bony tissues, thus limiting the onset of stre s s ielding and resulting implant looseni ng, and to favor the b ne in-growth through the interconnected pores. Mechanical and biological properties of these structures are strongly influenced by the size and spatial arrangement of res and struts. In the present work irregular and regular cellular as well s fully random porous structures re investigated through tensile a d compression uniaxial tests. Sp cific point of novelty of this work is that, beside classical compressive tests, which are standard characterization methods or porous/ cellular mat rials, tensile tests a e ca ried out. M chanical tests are compl mente with morphological analysis and p ros ty measure en s. An attempt i m de to fin correlations betwe n cell arrangem nts, porosity and mecha ical properties. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Cellular structures; porosity; Strength 1. Introduction Titanium alloys are the most preferred materials for production of bio-implants, as they exhibit high strength-to weight ratio, good corrosion resistance and excellent biocompatibility. However, there is still a mismatch in the elastic modulus of titanium implants and bone tissues surrounding the implant, which leads to stress shielding in that region. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Titanium alloys are the most preferred materials for production of bio-implants, as they exhibit high strength-to weight ratio, good corrosion resistance and excellent biocompatibility. However, there is still a mismatch in the elastic modulus of titanium implants and bone tissues surrounding the implant, which leads to stress shielding in that region. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 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 o ganizers. * Corresponding author. Tel.: +39-348-381-7779; fax: +0-000-000-0000 . E-mail address: sunil.raghavendra@unitn.it * Corresponding author. Tel.: +39-348-381-7779; fax: +0-000-000-0000 . E-mail address: sunil.raghavendra@unitn.it

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.2018.12.025