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) 317–321 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Fracture mechanical investigations on selective laser melted Ti-6Al-4V J.-P. Brüggemann*, L. Risse, G. Kullmer, B. Schramm, H. A. Richard Paderborn University, Direct Manufacturing Research Center (DMRC), Mersinweg 3, 33098 Paderborn, Germany Paderborn University, Fachgruppe Angewandte Mechanik (Applied Mechanics), Pohlweg 47-49, 33098 Paderborn, Germany Additive Manufacturing (AM) techniques such as selective laser melting (SLM) enable material efficient production of individual and complex components in a short period of time. One typical material that is processable by SLM is the titanium alloy Ti-6Al-4V. This alloy is frequently used in medicine technology because of low density, very high strength and biocompatibility. The AM process leads to many advantages like the opportunity to produce complex parts with for instance undercuts or lattice structures. As AM parts are used in various high-quality sectors the material properties are of great interest. Many influencing factors have an impact on the resulting material properties of additively manufactured Ti-6Al-4V products. For a reliable application and a fracture-safe construction the influence of different changes in the production parameters on the material properties have to be known. As Ti-6Al-4V is already processable and th mechanical and fra ture mechanical roperties for a d fined powder particle size distribution re known, the influen e of a varied powder particle size, in this case of a sig ifica tly smaller, average particle size is investigated in th scope of this paper. In detail, the mechanical and fracture mechanical behavior under different heat treatments is compared to existing data for the higher average particle size. Because of the resulting residual stresses during the building process a heat treatment is always necessary for a reliable structure. To determine the material properties, tensile tests according to DIN EN 10002-1 were conducted. For the fracture mechanical examinations compact tension specimens, according to ASTM 647-08 standard, were used. Fatigue crack growth curves with an R-ratio of 0.1 were investigated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 Th Authors. Published by Elsevier B.V. Peer-review under responsibility f the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Fracture mechanical investigations on selective laser melted Ti-6Al-4V J.-P. Brüggemann*, L. Risse, G. Kullmer, B. Schramm, H. A. Richard Paderborn University, Direct Manufacturing Research Center (DMRC), Mersinweg 3, 33098 Paderborn, Germany Paderborn University, Fachgruppe Angewandte Mechanik (Appli d Mechanics), Pohlweg 47-49, 33098 Paderborn, Germany Abstract Additive Manufacturing (AM) techniques such as selective laser melting (SLM) enable material efficient production of individual and complex components in a short period of time. One typical material that is process l by SLM is the titanium alloy Ti-6Al-4V. This alloy is frequently used in medicine technology because of low density, very high strength and biocompatibility. The AM process lead to many advantages like the opportunity to produ e complex parts with for instanc undercuts r lattice structures. As AM parts are used in various high-quality sectors the material properties are of great interest. Ma y influencing factors have an impact on th resulti g material properties of additively nuf ctured Ti-6Al-4V products. For a reli ble application and a fracture-safe construction the influence of different changes in the production parameters on the material properties have to be known. As Ti-6Al-4V is already processable and the mechanical and fracture mechanical properties for a defined powder particle size distribution are known, the influ nce of varied powder particle size, in this case of a significantly smaller, average particle size is investigated in the scope of this paper. In detail, the mechanical and fracture mechanical behavior under different heat treatments is compared to existing data for t e higher average particl size. Because of the r sulting residual stress s during the building process a heat treatment is always necessary for a reliable structure. To det rmine th material properties, tensile tests according to DIN EN 10002-1 were conducted. For the fracture mechanical examinations compact tension specim ns, according to ASTM 647-08 standard, were used. Fatigue crack growth curves with an R-ratio of 0.1 were investigated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Additive manufacturing; selective laser melting; Ti-6Al-4V; particle size distribution; fatigue crack growth behaviour © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Additive manufacturing; selective laser melting; Ti-6Al-4V; particle size distribution; fatigue crack growth behaviour Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* 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 organizers. * Corresponding author. Tel.: +49-5251-60-4388; fax: +49-5251-60-5322. E-mail address: brueggemann@fam.upb.de * Corresponding author. Tel.: +49-5251-60-4388; fax: +49-5251-60-5322. E-mail ad ress: brueggemann@fam.upb.de

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.2018.12.053