PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 273–280 Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com cienceDirect Structural Integ ity Procedia 00 (2016) 000 – 00 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Numerical analysis of damage evolution for materials with tension compression asymmetry Shenghua Wu a *, Nannan Song b , F.M.Andrade Pires a a Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias 4200-465 Porto, Portugal b INEGI , Rua Dr. Roberto Frias 4200-465 Porto, Portugal Abstract In recent decades, with the increasing attention to the carbon emission problem and shortage of energy, the development of lightweight metallic materials with Hexagonal closed packed (HCP) crystal structures, such as magnesium and titanium alloys, has become an important topic of research. The study and prediction of their mechanical behavior has become increasingly more important and has attracted growing interest in both academic and industrial communities. Metallic materials with a Hexagonal closed packed (HCP) crystallographic microstructure have an unconventional mechanical behavior including an anisotropic plastic response and strength differential effect (SD) in te sion nd compression. This behavior poses considerable challenges that are intensified in the presence of microstructural damage processes. In this contribution, a fully coupled continuum damage model with elasto- plastic Cazacu’s orthotropic plasticity criterion has been implemented. The coupling between damaging and material behaviour is accounted for within the framework of Continuum Damage Mechanics (CDM). The closest point projection methods (CPPM) are used to implement the continuum damage constitutive model in an implicit quasi-static finite element environment to update stress and state variables. Finite element simulation of damage evolution and fracture initiation in ductile solids is investigated. The results obtained are compared against both numerical and experimental results available in the literature and good agreement is found between them. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Numerical analysis of damage evolution for materials with tension compression asymmetry Shenghua Wu a *, Nannan Song b , F.M.Andrade Pires a a Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias 4200-465 Porto, Portugal b INEGI , Rua Dr. Roberto Frias 4200-465 Porto, Portugal Abstract In recent decades, with the increasing attention to the carbon emission problem and shortage of energy, the development of lightw ight metallic materials with Hex go al closed pa ked (HCP) crystal structures, uch as magnesium and titanium alloys, has become an important topic of research. The study and prediction of their mechanical be avior has become increasingly more important and has attr cted growing interest in both aca emic and industrial communities. Metallic materials with Hexagonal closed p ke (HCP) rystall graphic microstructure have an unconventional echanical behavior including an anisotr pic pla tic response and a st ength differential effect (SD) in tension and compression. T is behavior poses considerable challenges th t a e intens fied in the presenc of microstructural da age processes. In his contribution, a fully co pled continuum d mage m del with ela to- plastic Cazacu’s orthotropic plasticity crit rion has been implemented. The coupling b tween damaging and material be aviour is ccounted for within the framework of Conti uum Damage Mechanics (CDM). he clos st point projection methods (CPPM) are us to implement the continuum damage constitutive model in an implicit qua i-static finite lement environment to update stress and state variables. Finite ele ent simulation of damage evolution and fracture initiation in ductile solids is investigated. The results obtained are compared against both numerical and experimental results available in the literature and good agreement is found between them. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Fracture, strength differential (SD) effect, Continuum Damage, Constitutive modelling, HCP Metals. Copyright © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://cr ativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Fracture, strength differential (SD) effect, Continuum Damage, Constitutive modelling, HCP Metals.

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

* Shenghua Wu. Tel.: +351 939786091; fax: +351 225574199. E-mail address: shwoo2001@gmail.com * Shenghua Wu. Tel.: +351 939786091; fax: +351 225574199. E-mail address: shwoo2001@gmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2015 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 PCF 2016. 10.1016/j.prostr.2016.02.037