PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1955–196 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. ECF22 - Loading and Environmental effects on Structural Integrity Study of Various Conical Projectiles Penetration into Inconel-718 Target Israr ul Haq *a , Guo Weiguo a , Mariyam Arif b , Muhammad Zakir Sheikh a a Dept. of Aeronautical Structural Engineering, School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China b School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China Abstract Impact behavior of a spherical and four different apex angles (40°, 60°, 80° & 100°) of rigid conical projectiles into the Inconel-718 target plates are studied numerically, by using ABAQUS/Explicit. Johnson Cook constitutive model is used to define plasticity and failure properties of Inconel-718 target, whereas projectile is considered as a rigid material. Firstly, experimental results of spherical projectile impact on 2mm thick Inconel-718 target at the ballistic limit i.e., 133m/s is compared with that one of the simulations. According to which, numerical results predicted the deformation behavior in the target plate and size & mass of the plug, precisely. Afterwards, numerical simulations for ballistic performances were done for conical nose shaped projectile’s impact on subject target, and it has been concluded that projectile with minimum apex angle has the minimum ballistic limit. It has also been found that the variation in apex angle on ballistic limit has an increasing trend from 40° - 80° and subsequently it drops at 100°. Also, deformation modes by various conical projectiles near ballistic limit has been considered. To conclude the research, it has been observed that change in apex angle has significant effect on number of petals, crack length, curling of petals and bending of the target plate. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Ballistic Impact; Nickel Based Alloy; Perforation; Conical Projectile, Apex Angle © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Study of Various Conical Projectiles Penetration into Inconel-718 Target Israr ul Haq *a , Guo Weiguo a , Mariyam Arif b , Muhammad Zakir Sheikh a a Dept. of Aeronautical Structural Engineering, School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China b School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, Sha nxi 710049, China Abstract Impact behavior of a spherical and four different apex angles (40°, 60°, 80° & 100°) of rigid conical projectiles into the Inconel-718 target plates are studied umerically, by using ABAQUS/Explicit. Johnson Cook constitutive model is used to defin plasticity and failure properties of Incon l-718 target, whereas projectile is considered as a rigid material. Firstly, experim ntal results of spherical projectile impact on 2mm thick Inconel-718 targ t at the ballistic limit i.e., 133 /s is compared with that one of the simulations. According to which, nu erical results predicted the deformation behavior in the target plate and size & mass the pl g, precisely. Afterwards, numerical simulations for ballistic performances were done for conical nos shaped projectile’s impa t on subject t rget, and it has been concluded that projectile with minimum ap x angle has the minimum ballistic limit. It has also be n found th t the variation in apex angle on ballistic limit has an increasing trend from 40° - 80° and subsequently it drops at 100°. Also, deformation modes by various conical projectiles near ballistic limit has been considered. To conclud the research, it has been observed that change in pex angle has significant ffect on number of p tals, crack l ngth, urling of petals and bending of the target plate. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organiz rs. Keywords: Ballis ic Impact; Nickel Based Alloy; Perforation; Conical P oj ctile, Apex Angle

© 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.

* Corresponding author. Tel.: +86-155-0297-0718 E-mail address: israrrind@hotmail.com * Corresponding author. Tel.: +86-155-0297-0718 E-mail ad ress: israr ind@hotmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under r sponsibility of the ECF22 organizers.

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

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.265