PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 60 –607 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i ir t. 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Hyperelastic polymer material models for robust fatigue performance of automotive LED lamps C P Okeke a,b *, A N Thite a , J F Durodola a a d M T Greenrod b a Department of Mechanical Engineering and Mathematical Sciences, Oxford Brookes University, Oxford – OX33 1HX, UK b Wipac Ltd, London Road, Bucki gham, MK18 1BH, UK The object of this paper is to determine the statistics of parameters of hyperelastic models specific to Polybutylene Terephthalate filled with 30% glass fibre (PBT GF30) and Polymethyl Methacrylate (PMMA) materials used in automotive lamps. The hyperelastic behaviour of both materials, a semi-crystalline and an amorphous, is modelled using appropriate hyperelastic models. The stress-strain curves of the materials were measured under uniaxial tension using a non-contact video gauge. Five samples each were tested to measure the effect of manufacturing variability. The model parameter statistics were determined, the mean value of the model parameters were used to construct average stress-strain behavior, which is then compared to the experimental stresses. Among all the models and their associated parameters studied, the 3 - parameter Mooney-Rivlin model provided the most accurate prediction of the behaviour for both materials. The model showed excellent stability and is therefore the most appropriate model to represent variations due to the manufacturing process. The detailed study of the correlation of the model parameters provided a good understanding of h w the parameters are related to each other, enabling construction of complete pr bability distribution fu ctions f r further analysis. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Hyperelastic; material models; nonlinear s ress-strain; fatigu ; manufacturing variations 1. Introductio The modern automotive LED lamp housings and lenses are constructed of polymers providing a substantial weight saving and design flexibility. The material switch is attributed to the stringent emission legislations as well as functional requirements, allowing the realisation of highly sophisticated and complex lighting designs. tr t r l I t rit , I I , - t r , l, ir , rt l a,b , it a , l a n b a epart ent of echanical ngineering and athe atical Sciences, xford rookes niversity, xford – 33 1 , b ipac td, ondon oad, ucki gha , 18 1 , str ct e ject f t is a er is t eter i e t e statistic f ara eters f erelastic els ecific t l t le e ere t alate fille it lass fi re ( ) a l et l et acr late ( ) aterials se i a t ti e la s. e hyperelastic behaviour of both materials, a semi-crystalli e a a a r s, is elle si a r riate erelastic els. e stress-strai c r es f t e aterials ere eas re er ia ial te si si a -c tact i e a e. i e sa les eac ere teste t eas re t e effect f a fact ri aria ilit . e el ara eter statistics ere eter i e , t e ea al e f t e el ara eters ere sed to constr ct a era e stress-strai e a i r, ic is t e c are t t e e eri e tal stresses. Among all the models a t eir ass ciate ara eters st ie , t e - parameter Mooney-Rivlin model provided the most accurate prediction of the behavi r f r t aterials. e el s e e celle t sta ilit a is therefore the m st a r riate el to represent variations due to the manufacturing process. The detailed study of the correlation of the model ara eters r i e a ersta i f t e ara eters are relate t eac t er, e a li c str cti f c lete r a ilit istri ti f cti s f r f rt er a al sis. e t rs. lis e lse ier . . Peer-review under responsibility f t e cie tific ittee f I I . ey ords: yperelastic; aterial odels; nonlinear stress-strain; fatigue; anufacturing variations . I t ti r t ti l si s l s s r str t f l rs r i i s st ti l i t s i si fl i ilit . ri l s it is ttri t t t stri t issi l isl ti s s ll s f ti l r ir ts, ll i t r lis ti f i l s isti t l li ti si s. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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. Abstract I t r ti l f r

* Corresponding author. Tel.: +44-(0)1865-423011 E-mail address: 14101309@brookes.ac.uk * Corresponding author. Tel.: +44-(0)1865-423011 E-mail address: 14101309@brookes.ac.uk

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.022 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f I I .