PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 34 –346 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 Cruciform welded joints: hot-dip galvanization effect on the fatigue life and local energetic analysis. L. M. Viespoli a,* , F. Mutignani a , H. Remes b , F. Berto a a Department of Mechanical and Industrial Engi e rin , Norwegian University of Science and Technology (NTNU), Norway b Department of Applied Mechanics, Aalto University, Finland Abstract Even in a well-controlled technological process, a certain variability in the final product is present and this is very well the case of welded joints, where each single joint is slightly different from the others in terms of fillet dimensions, distortion, notch opening angle and root radius and material properties. When the fatigue life assessment of a welded joint is carried out using the Notch Stress Intensity Factors, their dimensions, so their critical values, vary as a function of the notch opening angle, according to William’s solution. This constitutes an adjunct level of complicacy in the implementation of the method, the most explicative case being the inability to use the same material property value in the same joint, this varying from weld toe to weld root. So considered, the local Stra n En gy Density, averaged on a critical volume of caref lly chosen radius on the base of the class of material and surrounding t e notch’s tip, has the great advantage of being a scalar value of rela ively simple numerical compu ation, almost ind pen ent of mesh refinement and independent of the notch-opening angle. The aim of the pap r is to adopt the l cal SED method to analyze the results of a series of test execute on fillet welded galvanized and non-galvanized cruciform steel joints. The tests are performed in atmosphere t room temperature. The interest is particularly focused on the influence of the zinc layer on the fatigue life of the joint and on the fitness of the method for its prediction, regardless of coating thickness. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Cruciform welded joints: hot-dip galvanization effect on the fatigue life and local energetic analysis. L. M. Viespoli a,* , F. Mutignani a , H. Remes b , F. Berto a a Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Norway b Depar ment of Applied Mechanics, Aalto University, Finland Abstract Even in a well-controlled technological process, a certain variability in the final product is present and this is very well the case of welded joints, where each single j int is slightly diff rent from the others in terms of fillet dimensions, distortion, notch opening angl an r ot radius and material properties. When the fatigue lif ssessment of a welde joint is carried out using the Notch Stress Intensity Factors, their dimensions, so their critical values, v ry as a function of the notch opening angle, according to William’s solution. This constitutes an adjunct level of complicacy in the implementation of the meth d, the most explicative case being he inability to use the same m terial property value in the same joint, this varying from weld toe to weld root. So considered, the local Strain Energy Density, averaged on a critical volume of carefully chosen radius on the base of the class of material and surrou ding the notch’s tip, has the g eat advantage f bei g a scalar value of relatively simple numerical computation, almost inde n ent of mes refinem nt and independent of the not h-opening angle. Th aim of the paper is to adopt the local SED method to analyz the results of a series of tests executed on fillet welded galvanized and non-galvaniz d cruciform steel joints. The tests are performed in atm sphere at room temperature. The interest is particularly focused on the influence of the zinc layer on the fatigue life of the joint and on the fitness of the m thod for its prediction, regardless of coating thickness. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: hot dip galvanization; strain energy density; welding; fatigue; structural steel; notch

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: hot dip galvanization; strain energy density; welding; fatigue; structural steel; notch

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

* Corresponding author. Tel.: +47 459 13 281. E-mail address: luigimv@stud.ntnu.no * Corresponding author. Tel.: +47 459 13 281. E-mail address: luigimv@stud.ntnu.no

* 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.

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.2018.12.057