PSI - Issue 2_A

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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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Experimental and numerical investigation of fracture in fillet welds by cross joint specimens Benjamin Werner a , Horst Heyer a , Manuela Sander a, * a Institute of Structural Mechanics (StM), University of Rostock, Albert-Einstein-Str. 2, D-18059 Rostock, Germany Abstract The load capacity of fillet welds is investigated experimentally and numerically in cross joint specimens with the objective of calibrating multiple failure criteria for the ductile fracture of weld metal. The cross joint specimens are composed of mild shipbuilding steel with plate thicknesses of 20 mm and 30 mm respectively. The fillet welds are manually produced by flux-cored arc welding, using the filler metal Elgacore MXX100. To achieve different stress states in the weld joints, forces in two different directions and moments about two different axes are applied separately on various specimens. A uniquely designed specimen is employed for each load scenario. For the numerical investigations, an appropriate discretization of the weld joints is established by taki g into account the distribution of the metallographic structure with the weld metal and the heat-aff cted zone. The distribution of the different materials is determined by a macrosection of a weld joint. The material behavior, in terms of true stress-strain curves for the weld metal and the material of the heat-affected zone, is identified by hardness measurements. With the established discretization of the weld joints and true stress-strain curves of the different materials, the experimentally determined force-displacement curves are reproduced in finite element analyses. Furthermore, the Rice and Tracey (1969) failure criterion and the Gurson (1977) damage model are successfully calibrated for the weld metal. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Experimental and numerical investigation of fracture in fillet welds by cross joint specimens Benjamin Werner a , Horst Heyer a , Manuela Sander a, * a Institute of Structural Mechanics (StM), University of Rostock, Albert-Einstein-Str. 2, D-18059 Rostock, Germany Abstract The load capacity of fillet welds is investigated experimentally and numerically in cross joint specimens with the objective of calibrating multiple fa ure criteria for the ductile fracture of weld metal. The cross joint specimens are composed of mild shipbuilding steel with plate th cknesses of 20 mm and 30 mm resp ctively. The fillet welds are manually p oduced by flux-core arc welding, using the fi ler metal Elgac re MXX100. To achieve differ nt stress states in the weld joints, f rces in two different directions and moments about two different axes are applied s parately on variou specimens. A uniquely designed spec m n is employed for each load scenario. For the umeric l investigations, an appropriate discretization of the wel joints is established by taking into count th distribution of th metallographic structure with th weld me al and the h at-affected zone. The distribution of the different a e ials is determin d by a macro ection of a weld joint. The m terial be avior, in terms of tru str s-str in curv s for the w ld metal and the material of the heat-affected zone, is identified by h rdness m asure ents. With the establ shed di cretization of the wel joints and true stress-strain curves of the d ferent materials, the experimentally determined force-displaceme t curv s are reproduced in finite element analyses. Furthermore, the Rice and Trac y (1969) failure crit io and the Gurson (1977) damage model are successfully calibrated for the weld metal. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: fracture; fillet welds; cross joint specimens; finite elements 1. Introduction Collisions between ships are a danger to human life and may lead to env ronmental pollution through the loss of carg and the spillage of oil. Active measures such as electronic navigat on aids help improve maritim traffic Copyright © 2016 The Authors. Published by El evier B.V. This is an open access article u der the CC BY-NC-ND licen e (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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 Collisions between ships are a danger to human life and may lead to environmental pollution through the loss of cargo and the spillage of oil. Active measures such as electronic navigation aids help improve maritime traffic Keywords: fracture; fillet welds; cross joint specimens; finite elements

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +49 (0) 381 498-9341; fax: +49 (0) 381 498-9342. E-mail address: manuela.sander@uni-rostock.de 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +49 (0) 381 498-9341; fax: +49 (0) 381 498-9342. E-mail address: manuela.sander@uni-rostock.de

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.258