PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1367–1374 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Int rfacial fracture strength property of micro-scale SiN/Cu components Yoshimasa Takahashi a, *, Kazuya Aihara a , Itaru Ashida a , Masanori Takuma a , Kenichi Saitoh a , Tomohiro Sato a , Kimitaka Higuchi b , Yuta Yamamoto b , Shigeo Arai b , Shu suke Muto b a Department of Mechanical Engi eering, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan b Institute of Materials and Systems for sustainability (IMaSS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan The strength against fracture nucleation from an interface free-edge of silicon-nitride (SiN)/copper (Cu) micro-components is evaluated. A special technique that combines a nano-indenter specimen holder and an environmental transmission electron microscope (E-TEM) is empl yed. The critical load at the onset of fractur nucleation from a we ge-shaped fre -edge (opening angle: 90°) is measured both in a vacuum and in a hydrogen (H 2 ) e vironment, and the critical stress distribution is evaluated by the finite element method (FEM). It is found that the fracture nucleation is dominated by the near-edge elastic singular str ss fiel that xtends about a few tens of n nometers from the edge. The fracture nucleation st ength expr ssed in ter s of the stress intensity factor ( K ) i found to be eminently reduc d in a H 2 environment. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Micro-components; Silicon-nitride; Copper; Interface free-edge; Fracture nucleation; Hydrogen; Transmission electron microscope 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Interfacial fracture strength property of micro-scale SiN/Cu components Yoshimasa Takahashi a, *, Kazuya Aihara a , Itaru Ashida a , Masanori Takuma a , Kenichi Saitoh a , Tomohiro Sato a , Kimitaka Higuch b , Yuta Yamamoto b , Shigeo Arai b , Shunsuke Muto b a Department of Mechanical Engineering, Kansai University, 3-3-35 Yamate-cho, Suita-shi, Osaka 564-8680, Japan b Institute of Materials and Systems for sustai abili y (IMaSS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan Abstract The strength against fracture nucleation from an interface free-edge of silicon-nitride (SiN)/copper (Cu) micro-components is evaluat d. A special te hnique that combines a nano-indent r specimen h lder and an environmental transmission el ctron microscope (E-TEM) is employed. The critical load at the o s t of fracture nucl ation from a wedge-sh ped free-edge (opening angle: 90°) is measured both in a vacuum and in a hydrogen (H 2 ) environme t, and the critic l stress distribution is evaluat d by the finite element method (FEM). It is found that the fracture nucleation is dominated by the near-e ge elastic singular stress field at ext nds ab ut a few tens of nanometers from the edge. Th fracture nucleation strength expr ssed n terms of the str ss intensity factor ( K ) s ound to be eminently educed in a H 2 nvironment. © 2016 The Authors. Published by Els vier B.V. Peer-review und r espons bility of the Scientific Committee of ECF21. Keywords: Micro-components; Silicon-nitride; Copper; Interface free-edge; Fracture nucleation; Hydrog n; Transmission electron micro ope 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. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction Advanced micro-devices such as large-scale integration (LSI) or micro-electromechanical systems (MEMS), as they are fabricated via multi-step mask-etching/deposition processes, contain many micron / submicron-scale structu al compon nts and their in rfaces. The structural integrity of these devices then depends trongly on th Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Advanced micro-devices such as large-scale integration (LSI) or micro-electromechanical systems (MEMS), as they are fabricated via multi-step mask-etching/deposition processes, contain many micron / submicron-scale structural components and their interfaces. The structural integrity of these devices then depends strongly on the Abstract 1. Introduction

* 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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +81-6-6368-0748; fax: +81-6-6368-0748. E-mail address: yoshim-t@kansai-u.ac.jp * Corresponding author. Tel.: +81-6-6368-0748; fax: +81-6-6368-0748. E-mail address: yoshim-t@kansai-u.ac.jp

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.2016.06.174