PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 123–13 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

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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 Failure Analysis of Composite Repaired Pipelines with an Inclined Crack under Static Internal Pressure Amr A. Abd-Elhady a,b, *, Hoss m El-Din M. Sallam a,c , Muhammad A. Mubaraki a a Faculty of Engineering, Jazan University, Jazan 706, Kingdom of Saudi Arabia. b On sabbatical leave from Faculty of Engineering, Helwan University, Cairo, Egypt. c On sabbatical leave from Faculty of Eng., Zagazig University, Zagazig, Egypt. The aim of the present work is to study the efficiency of the glass fiber reinforced polymer patch for repairing cracked steel pipe subjected to internal pressure. The effect of fiber orientation, [0 o ] 8s , [90 o ] 8s , and [0 o /90 o ] 4s , of bonded composite repair on reducing J -integ al of stationary crack with different inclination angles (  ) is studied using the 3-D finite element method, FEM. Extended FEM has been adopted to simulate the crack growth of different inclined stationary cracks in steel pipe subjected to internal pressure. It as been found that, the growing crack manated from inclined sta ionary crack witche its path to be under pure mode I. The r ck initiation pressure of i clined stationary crack in steel pipe with composite repair is high r than that of pipe without composite repair. The composite repair reduced the value of J -integral of stationary crack in steel pipe. This reduction is strongly affected by the crack length and  of the stationary crack and it is fairly affected by the fiber orientation. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Mode of mixity; stress intensity factors; J-integral; composite repair patch; 3-D FEM Amr A. Abd-Elhady a,b, *, Hossam El-Din M. Sallam a, m a a a lt f i i , i it , , i f i i . b ti l l f lt f i i , l i it , i , t. c ti l l f lt f ., i i it , i , t. ct i t t i t t t i i t l i i l t i i t l i j t t i t l . t i rientatio , o s , o s , o / o s , it i i i t l t ti it i t i li ti l i t i i t i it l t t , . t t t i l t t t i t i li t ti i t l i j t t i t l . t t, t i t i li t i it it t t . i iti ti li t ti i t l i it it i i i t t t i it t it i . it i t l i t l t ti i t l i . i ti i t l t t l t t t ti it i i l t t i i t ti . t s. Published by Elsevier B.V. Pe r- i under re i ilit t i ti i itt . : f i it ; tr i t it f t r ; -i t r l; it r ir t ; - © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

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Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Steel pipelines are increasingly used for a variety of applications, such as in the oil, gas and high pressure container industries. Operating steel pipe in cru l environmental con itions can expose it to a variety of damage types such as erosion, corrosion, and mechanical damage (El-Bagory et al., 2013, 2014, and 2015). i t i . ti t l i i l t l iti it t i t t i , i , i l l t l., , , .

* Corresponding author. Tel.: +966-564-612-865 ; fax: +966-173-232-600. E-mail address: aelhady@jazanu.edu.sa , aaa_elhady@yahoo.com i t r. l.: - - - ; f : - - - . - il : l j . . , l . 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.2017.07.077 * 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