PSI - Issue 7

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 7 (2017) 11–18 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 il l li t . i ir t. i i tructural Integrity rocedia 00 (2017) 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. 3rd International Symposium on Fatigue Design and Material Defects, FDMD 2017, 19-22 September 2017, Lecco, Italy Defect Analysis and Fatigue Design Basis for Ni-based Superalloy 718 manufactured by Additive Manufacturing Yoichi Yamashita a , Takao Murakami a , Rei Mihara a , Masami Okada b ,Yukitaka Murakami b,c * a IHI Corporation, Yokohama, Japan b KMTL (Kobe Material Testing Laboratory Co. Ltd.), Kobe, Japan c Kyush Univ rsity, Fukuoka, Japan Abstract It is well known that high strength metallic mat rials with Vickers hardness HV >400 are very sensitive to small defe ts. This paper discusses fatigue properties of a Ni-based Superalloy 718 with HV =~470 which was manufactured by additive manufacturing (AM). The advantage of AM has been emphasized as t e potential application to high strength or hard steels which are difficult to manufacture y traditional machining to complex shapes. However, the disadvantage or challenge of AM has been pointed out due to defects which are inevitably contained in the anufacturing process. Defects of the material investigated in this study were mostly gas porosity and those made by lack of fusion. The √ area parameter model was confirmed the successful application. Although the statistics of extremes analysis is useful for the quality control of AM, the particular surface effect on the effective value of defect size must be carefully considered. Since the orientations of defects in AM materials are random, a defect in contact with specimen surface has higher influence and has the effective larger size termed as √ area eff than the real size, √ area , of the defect from the viewpoint of fracture mechanics. The guide for the fatigue design and development of higher quality Ni-based Superalloy 718 by AM processing based on the combination of the statistics of extremes on defects and the √ area parameter model is proposed. r I t r ti l i ti i t ri l f t , , - t r , , It l i i it , i , i i a , i a b ,Yukit i b,c * a I I r r ti , , b KMTL (Kobe Material Testing Laboratory Co. Ltd.), Kobe, c s i ersit , , str ct It is ell t at i str t etallic at rials it ic ers ar ess re er se siti e t s all efe ts. is a er isc sses fati e r erties f a i- ase erall t ic as a fact re a iti e a fact ri ( ). e a a ta e f as ee e asize as t e te tial a licati t i stre t r ar steels ic are iffic lt t a fact re tra iti al ac i i t c le s es. e er, t e is a ta e r c lle e f as ee i te t e t efects ic are i e ita l c tai e i t e a fact ri r cess. efects f t e aterial i esti ate i t is st ere stl as r sit a t se a e lac f f si . e area ara eter el as c fir e t e s ccessf l a licati . lt t e statistics f e tre es a al sis is s f l f r t e alit c tr l f , e artic lar s rfac effect e ff cti e al e f efect size st e caref ll c si ere . i ce t e rie tati s f efects i aterials are ra , a efect i c tact it s eci e s rface as i er i fl e ce a as t e effecti e lar er size ter e as re eff t a t real siz , re , f t e efect fr t e ie i t f fract re ec ics. e i e f r t e fati e esi a e el e t f i er alit i- ase erall r cessi ase t e c i ati f t e statistics f e tre es efects a t e a ea ara eter el is r se . © 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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. © 2017 The Authors. Published by Elsevier B.V. e t s. blished by Elsevi r B.V.

* Corresponding author. Tel.: +81-92-606-3832; fax: +81-92-606-3832. E-mail address: murakami.yukitaka.600@m.kyushu-u.ac.jp * orresponding author. el.: 81-92-606-3832; fax: 81-92-606-3832. - ail address: uraka i.yukitaka.600 .kyushu-u.ac.jp

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt efects. 2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 2452-3216 2017 he uthors. ublished by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f t e r I ter ati al si ati e esi a aterial

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of the 3rd International Symposium on Fatigue Design and Material Defects. 10.1016/j.prostr.2017.11.054