PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1244–1249 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 High Rate Response and Dynamic Failure of Aluminosilicate Glass under Compression Loading Sheikh Muhammad Zakir a , Wang Zhen a , Suo Tao a, *, Li Yulong a , Zhou Fenghua b , Ahmed Sohail a , Uzair Ahm d Dar a a School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, PR China. b Ningbo University, Ni gbo 315211, PR China. Abstract The mechanical behavior of un-strengthened aluminosilicate (ALS) glass is studied experimentally by using modified Split Hopkinson pressure bar and electronic universal testing machine. The compression tests on glass specimens are performed at strain rates in the range of 10 �� to 10 � �� . The compression tests data revealed that ALS glass is strain-rate sensitive vis-à-vis the compressive strength of the glass. In dynamic compression tests, failure process of glass is investigated using a high-speed camera and the failure process in ALS glass is explicated with the associated stress-time history. The initiation of crack, development, and glass debris are discussed to explain the failure process of glass specimens. Test results showed that the axial splitting lead to final rupture of the glass. From both static and dynamic compression tests, the compressive strength, failure strain and energy absorption results for ALS glass specimens are also compared. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Aluminosilicate glass; Compressive strength; High-speed photography; Rate sensitivity; Split Hopkinson pressure bar (SHPB); 1. Introduction Glass because of its properties like low density, high compressive, high impact/shock resistance, transparency and low manufacturing cost are extensively used in civil, military and aerospace applications. In order to improve ballistic impact resistance of aircraft windshield, buildings and vehicle bulletproof windows, glass panes are bonded together by using a transparent polymer interlayer (usually TPU- thermoplastic polyurethane and PVB- polyvinyl butyral) to © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity High Rate Response and Dynamic Failure of Aluminosilicate Glass under Compression Loading Sheikh Muhammad Zakir a , Wang Zhen a , Suo Tao a, *, Li Yulong a , Zhou Fenghua b , Ahmed Sohail a , Uzair Ahmed Dar a a School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, PR China. b Ningbo University, Ningbo 315211, PR China. Abstract The mechanical behavior of un-strengthen d aluminosilicate (ALS) glass is tudi d experimentally by using modified Split Hopkinson pressur bar and electronic universal testing machine. The compression tests on glass specimens are performed at strain rates in the range of 10 �� to 10 � �� . The compression tests data revealed that ALS glass is strain-rate sensitive vis-à-vis the compressive strength of the glass. In dynamic compression tests, failure process of glass is investigated using a high-speed camera and th failure process in ALS glass is explicated with the associated stress-time history. The initiation of crack, development, and glass debris are discussed to expl in th failure process of glass sp cimens. Test results showed that the axial splitting lead to final rupture of the glass. From both static and dynamic compression tests, th compressive strength, failure strain and energy absorption results for ALS glass specimens are also compared. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Aluminosilicate glass; Compressive strength; Hig -speed photography; Rate sensitivity; Split Hopkinson pressure bar (SHPB); 1. Introduction Glass because of its properties like low density, high compressive, high impact/shock resistance, transparency and low manufacturing cost are extensively used in civil, military and aerospace applications. In order to improve ballistic impact resistance of aircraft windshield, buildings and vehicle bulletproof windows, glass panes are bonded together by using a transparent polymer interlayer (usually TPU- thermoplastic polyurethane and PVB- polyvinyl butyral) to © 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.: +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. * Corresponding author. Tel.: +86-29-88494381; fax: +86-29-88491544. E-mail address: suotao@nwpu.edu.cn * Corresponding author. Tel.: +86-29-88494381; fax: +86-29-88491544. E-mail ad ress: suotao@nwpu.edu.cn

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.2018.12.255