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 P o edi Structural Integr ty 5 (2017) 19–26 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 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 Mixed mode fracture behavior of concrete pavement containing RAP - 3D finite element analysis M.A. Mubaraki a , A.A. Abd-Elhady a,b, * , S.A. Osman c , and H.E.M. Sallam a,d 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 College of Engineering, University of Dammam, Dammam, KSA. d On sabbatical leave from Faculty of Engineering, Zagazig University, Zagazig, Egypt. Reclaimed asphalt pavement (RAP) is commonly used to improve the sustainability of asphalt concrete pavement. The main objective of the present work is to study the effect of RAP content on the mixed mode fracture behavior of concrete pavement numerically. An extended finite-element model was adopted to simulate crack growth under mixed mode loading. Semi-circular bending (SCB) specimen was used with three different crack geometries, namely inclined crack at the middle with different inclination angles (SCB-1) and vertical crack subjected to asymmetric three point bending. The effect of specimen geometry on the mode I fracture toughness ( K IC ) has been studied. The relationships between both RAP content and specimen geometry and mixed mode fracture toughness have been correlated. It is found that, the present 3D finite element model is a good candidate to predict the fracture behavior of concrete pavement containing RAP. To examine the reliability of each type of specimen geometry for predicting K IC , the maximum undamaged defect size ( d max ) concept has been applied. It is found that, K IC predicted from the classical SCB (SCB-1) is reliable compared the values predicted from the other specimen geometries. Where the ratio of d max to the maximum aggregate size ( d max /MAZ) ranged between unity and 2 in the case of SCB-1, it ranged between 5 and 14 in the other cases. Furthermore, the relationship between the present numerical values of K IC predicted from SCB-1 speci en and the flexural strength measured experimentally by Hossiney et al. (2010) is strongly correlated. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Mixed mode f acture behavior of concrete pavement containing RAP - 3D finite element analysis M.A. Mubaraki a , A.A. Abd-Elhady a,b, * , S.A. Osman c , and H.E.M. Sallam a,d a Faculty of Engin ering, J zan Univers ty, Jazan 706, Kingdom of Saud Arabia. b On sabbatical leave from Faculty of Engineering, Helwan University, Cairo, Egypt. c Co l ge of Engineering, University of Dammam, Dammam KSA. d On sabbatical leave from Faculty of Engineering, Zagazig University, Zagazig, Egypt. Abstract Reclaimed asphalt pavement (RAP) is commonly used to improve the sustainability of sphalt concrete pavement. The ain objective of the present work is to study the ffect of RAP c ntent on the mixed mode fracture behavior f concrete pavement numeric lly. An extended finite-element model was adopted to simulate crack growth under mixed mod loa ing. Semi-circular bending (SCB) specimen was used with three different crack geometries, namely i clined crack at the middle with different inclination angles (SCB-1) and vertical crack ubjected to asymmetric thr e point bending. The ffect of specimen geometry on the mode I fracture toughness ( K IC ) has been studied. The relationships between both RAP content an specimen geometry and mixed mode fracture toughness have b en corr lated. It is found that, the present 3D finite element model is a good candidate to predict the fracture b havior of concrete pavem nt containing RAP. To ex min the reliability of each type of s ecimen ge etry for predicting K IC , the maximum undamaged defect size ( d max ) concept has been applied. It is found that, K IC predicted fro the classical SCB (SCB-1) is reliable compared the values predicted from the other specimen geometries. Where the ratio of d max to the maximum aggregate size ( d max /MAZ) ranged between unity and 2 in the case of SCB-1, it ranged between 5 and 14 in the other cases. Furthermore, the relationship betwee th present numerical values of K IC predicted from SCB-1 specimen and the flexural strength measured experimentally by Hossiney et al. (2010) is strongly correlated. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Com ittee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: Concrete pavement; RAP; mixed-mode fracture toughness; the maximum undamaged defect size concept. Keywords: Concrete pavement; RAP; mixed-mode fracture toughness; the maximum undamaged defect size concept.

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.2017.07.054 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +0-966-564-612865; fax: +0-966-173-232600. E-mail address: aelhady@jazanu.edu.sa , aaa_elhady@yahoo.com * Corresponding author. Tel.: +0-966-564-612865; fax: +0-966-173-232600. E-mail address: aelhady@jazanu.edu.sa , aaa_elhady@yahoo.com