PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 523–528 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t 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 Numerical investigation of climate change impacts on European wood species vulnerability Seif Eddine Hamdi a, *, Rostand Mouttou Piti a,b a Université Clermont Auvergne, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France b CNAREST, IRT, BP 14070, Libreville, Gabon Abstract Moisture levels are considered as a critical environmental impacting factor for wood and its components, as the moisture content (MC) influences virtually all the physical and mechanical properties. Adsorbed moisture is known to cause significant dimensional changes, as well as changes in mechanical properties such as the modulus of elasticity, stress factors and brittleness. In green wood, water droplets moved away from the cell lumens around the crack tip. Drying of wood induces micro-cracking and crack bridging as toughening mechanisms. To quantify the effect of humidity, fracture patterns and properties at various moisture levels are numerically investigated. Finite element simulations were performed on a modified Douglas Mixed-Mode Crack Growth specimen (MMCG). The crack growth process as well as the opening crack under temperature and moisture variations were calculated under various mixed mode ratios, and mixed modes energy releas rates were evaluated. The distributed damage patterns in the m st stressed reg ons between the area where concentrated force is applied and t e notch plane where the fracture i itiates is also taken int account here. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Fracture mechanisms; moisture; finite element analysis; numerical modelling; solid wood. 1. Introduction Cur ntly, worldwide, and arguably European industries, are showing increasing interest in wood based structures. Economic and environmental contexts have enabled the emergence of new markets for green constructions that have thus far been confined for steel and concrete based structures. The work on improving the mechanical properties of © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Numerical investigation of climate change impacts on European wood species vulnerability Seif Eddine Hamdi a, *, Rostand Mouttou Piti a,b a Université Clermont Auvergne, CNRS, Institut Pascal, F-63000 Clermont-Ferrand, France b CNAREST, I T, BP 14070, Libreville, Gabon Abstract Moisture levels are considered as a critical environmental impacting factor for wood and its components, as the moisture content (MC) influences virtually all the physical and mechanical properties. Adsorbed moisture is known to cause significant dimensional changes, as w ll a changes in m chanic l properties su h as th modulu of elasticity, stress factors and brittleness. In green wood, water droplets moved away from the cell lumens around the crack tip. Drying of wood induces micro-cracking a d crack bridging as toughening mechanisms. To quantify the ffect f humidity, fracture patterns and properties at various moisture levels are numerically investigated. Finite element simulations wer performed on a modified Dougl s Mixed-Mode Crack Growth specimen (MMCG). The crack growth process as well as the opening crack un er temperature and moisture variations were calculated under various mixed mode ratios, and mixed modes en rgy release rates w re evaluated. The distributed damage patt rns in th most stressed regions between the area where concentrated force is applied and th notch plane where the fracture initiates is also taken into account here. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Fracture mechanisms; moisture; finite element analysis; numerical modelling; solid wood. 1. Introduction Currently, worldwide, and arguably European industries, are showing increasing interest in wood based structures. Economic and environmental contexts have enabled the emergence of new markets for green constructions that have thus far been confined for steel and concrete based structures. The work on improving the mechanical properties of © 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.

* 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. * Hamdi Seif Eddine. Tel.: +33 (0) 540006588; fax: +33 (0) 540003113. E-mail address: seif-eddine.hamdi@u-bordeaux.fr * Hamdi Seif Eddine. Tel.: +33 (0) 540006588; fax: +33 (0) 540003113. E- ail address: s if-eddine.hamdi@u-bordeaux.fr

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.2018.12.086