PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 35 –357 ScienceDire t Structural Integrity Procedia 00 (2016) 000–000 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Controlled disi tegration of reinforced concrete blocks based on wave and fracture dynamics Koji Uenishi a *, Naoyuki Shigeno a , Shintaro Sakaguchi a , Hiroshi Yamachi b , Junichiro Nakamori b a Department of Aeronautics and Astronautics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan b Sumitomo Mitsui Construction Co., Ltd., 518-1 Komagi, Nagareyama, Chiba 270-0132, Japan In this contribution, field experiments of dynamic fracture by electric discharge impulses (EDI) are performed and fracture development in rectangular concrete blocks with reinforcing steels bars is analyzed also numerically in the three-dimensional context. It is found that the development of fracture network depends very sensitively on the geometrical settings (e.g. positions of empty dummy holes prepared for controlling crack propagation directions) in the blocks, and cracks extending from blast holes may tend to arrest on the (pre-)existing planes of weakness (e.g. interfaces between concrete material and reinforcing steel bars). This characteristic can be used to actualize more efficient and precise disintegration of a given structure, for instance, removal of reinforced concrete (RC) lining segments from the surroundings in an underground space. Optimal positions of blast and empty dummy holes for predictable and controlled dynamic destruction may be determined for each specific structure by the established simulation technique, which is effective for both conventional and modern dynamic disintegration methodologies, namely, fragmentati n by blasting using explosives as well as by EDI. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of he Sci ntific Committee of ECF21. Keywords: Controlled dynamic disintegration; wave interaction; fractur dynamics; lectric disch rge impulse 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Controlled disintegration of reinforced concrete blocks based on wave and fracture dynamics Koji Uenishi a *, Naoyuki Shigeno a , Shintaro Sakaguchi a , Hiroshi Y machi b , Junich ro Nakamori b a Department of Aeronautics and Astronautics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan b Sumitomo Mitsui Construction Co., Ltd., 518-1 Komagi, Nagareyama, Chiba 270-0132, Japan Abstract In this contribution, field experiments of dynamic fracture by ele tric discharge impulses (EDI) are performed and fracture development in rectangular concrete bl cks with reinforcing ste s bars is an lyzed also numerically in the three-dimensional context. It is found that the development of fracture network depend ve y sensitively on the geometrical set ings (e.g. positions of empty dummy holes prepared for controlling rack propagation direction ) in he bl cks, and cracks ext nding from blast holes may tend to arrest on th (pre-)existi g pla es of weakness (e.g. int rface betwe n concrete material and rei forcing steel bars). This characteristic can be used to actualize more efficient and precise disintegration of a given structure, for instance, removal of reinforced concrete (RC) lining segments from the surroundings in an under ound sp ce. Optimal positi ns of blast and empty dummy holes for predictable and controlled dynamic destruction may be determined for each specific structure by the established simulation technique, which is effective for both conventional nd mod n dynamic disint gration methodologies, namely, fragmentation by blasting using explosi s as well as by EDI. © 2016 The Authors. Published by Elsevier B.V. Peer-review under respons bility of the Scientific Committee of ECF21. Keywords: Controlled dynamic disintegration; wave interaction; fracture dynamics; electric discharge impulse 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. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introductio 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Developing controllable disintegration (fragmentation) techniques for geomaterials such rocks and concrete is of critical significance in order to achieve safer and more efficient operation in tunneling, mining, structural demolition Developing controllable disintegration (fragmentation) techniques for geomaterials such rocks and concrete is of critical sign ficance in ord r to achieve safer and more efficient operati n in tunn l ng, mining, structural demol ti n

* 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.: +81-3-5841-6574; fax: +81-3-5841-6574. E-mail address: uenishi@dyn.t.u-tokyo.ac.jp * Corresponding author. Tel.: +81-3-5841-6574; fax: +81-3-5841-6574. E-mail address: uenishi@dyn.t.u-tokyo.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.2016.06.045