PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 5 (2017) 4 –47 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. Structural Integrity Procedia 00 (2017) 000 – 000

www.elsevier.com/locate/procedia . l i r. /l t / r i

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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Mixed-mode fracture characteristics of metal-to-metal adhesively bonded joints: experimental and simulation methods M G Droubi * , J Mcafee, R C Horne, S Walker, C Klaassen, A Crawford, A K Prathuru and N H Faisal * School of Engineering, Robert Gordon University, Garthdee Road, Aberdeen, AB10 7GJ, UK Fracture behavior of adhesively bonded joints subjected to mixed-mode (i.e. mode I+II) loading conditions is of importance in many industrial applications. This research therefore aims to characterise the failure behaviour of metal-to-metal (i.e. both aluminium adherends) adhesive joints using the mixed mode bending test (MMB), adapted from ASTM D6671/D6671M standard, along with instrumentation using acoustic emission (AE) sensor. Twenty-four adhesively bonded specimens were prepared using two types of adhesive bond materials (acrylic, cyanoacrylate) with two different bonded area 65% and 100%. To understand the effect of mixed-mode loading conditions on the failure behavior, two different mixity ratios were achieved through the design of the MMB test fixture and tested for each bonded joint. The AE results during mechanical testing shows that the time domain signals were spread over the loading phase with distinct features for different mixity ratios. They successfully identified the moment of adhesive fracture during every test. Also, the fracture behavior f t e bonded joints was simulated using virtu l crack closure technique (VCCT) method using finite element method to understand the loading dyna ics in specimen when considering a combination of various design parameters. In addition, an analytical method ( .g. correc ed beam theory or CBT) was used to det rmi e strain energy r lease ates f ach specimen. The resu ts show that both the brittle and ductile specimens xhibited higher energy rel as rates w en mode II prop rtion of loadi g increase during the c ack initi tio phas . The proposed m asur ment can be useful to assess the over ll structural health of bonded systems. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. d * School of Engineering, Robert Gordon University, Garthdee Road, Aberdeen, AB10 7GJ, UK t i i l j i t j t t i i. . l i iti i i t i i t i l li ti . i t i t t i t il i t l t t l i. . t l i i rends) ad i j i t i t i i t t , t / t , along with instrumentation using acoustic emission (AE) sensor. Twenty-four adhesively bonded specimens were prepared using t t i t i l li , l t it t i t . t t effect of i l i iti t il i , t i t i it ti i t t i t t t i t t t j i t. lt i i l t ti t t t ti i i l t l i it i ti t t i t i it ti . ll i ti i t t i t i t t. l , t t i t j i t i l t i i t l l t i t i i it l t t t t t l i i i i i i i ti i i t . iti , l ti l t . . t t t t i t i l t i . t t t t t ittl til i i it i l t ti l i i i t i i i ti . t l t t r l t t l lt t . © 2017 The Authors. Published by Elsevier B.V. -r i i ilit t i ti i itt . © 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: mixed-mode fracture; adhesively bonded joints; acoustic Emission : i - fr t r ; i l j i t ; ti i i Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +44(0)1224-26-2336. E-mail address: m.g.droubi@rgu.ac.uk; n.h.faisal@rgu.ac.uk; i t r. l.: ( ) - - . - il : . . r i r . . ; . .f i l r . . ; * rr

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.2017.07.059 * 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. l i r . . i i ilit t i ti i itt . - t r . li