PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 511–516 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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 Experimental and Morphological Investigations of Fracture Behavior of PBT/TPEE Dani Abdo a,b , Andrew Gleadall a , Dirk Sprengel b , Vadim V. Silberschmidt a* a Wolfson School of Mechanical, Electrical and Manufacturing Engineeri g, Loughborough University, Loughborough, UK b School of Mechanical Engineering, Rheinische Fachhochschule Koeln, Cologne, Germany Short-fiber-reinforced polymers are widely used in industry. They are light-weight, have excellent mechanical properties and can be processed via injection molding. This allows the mass production of high-quality components with high geometric accuracy. Their superior electrical isolation properties make them a good choice for electrical housings in the automotive sector. Due to the importance and precise nature of applications, in which such products are employed, many studies have investigated the properties of these materials. Polybutylenterephthalat (PBT) with thermoplastic polyester elastomer (TPEE), an impact-enhancing additive, is a typical example. Still, there is a lack of knowledge regarding the effect of TPEE on mechanical and fracture behaviors of short-fiber-reinforced PBT and the effect of its microstructure on the dynamic performance. To study the characteristics of modified short-fiber reinforc d PBT and to assess the effect of the filament, two types of polymers - standard PBT-GF10 and PBT-GF10 blended with 10% TPEE - were co pare . Morphologic l investigation of fracture surfaces produced in tensile tests at different loading rates was undertaken with scanning electron microscopy (SEM). Further two-dimensional image analysis was completed with the image processing software ImageJ. The morphological analysis showed that TPE-E generally affected the microstructure of the material. Micrographs of fracture surfaces demonstrated a decrease in the size of area of ductility with increasing loading rate. These results will support the development and design of optimized parts and their processing methods. ECF22 - Loading and Environmental Effects on Structural Integrity Experimental and Morphological Investigations of Fracture Behavior of PBT/TPEE Dani Abdo a,b , Andrew Gleadall a , Dirk Sprengel b , Vadim V. Silberschmidt a* a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, UK b School of Mechanical Engineering, Rheinische Fachhochschule Koeln, Colog e, Germany Abstract Short-fiber-reinforced polymers are widely used in industry. They are light-weight, have excellent mechanical properties and ca be processed via injection molding. This allows the mass production of high-quality components with high geometric accuracy. Their superior electrical is lation properties make them a good choice for electrical housings in the automotive sector. Due to the importance and precise nature of applications, in w ich such products are employed, many studies have investigated the properties of these materials. Polybutylenterep thalat (PBT) with thermoplastic polyester elastomer (TPEE), an impact-enhancing additive, is a typical example. Still, there is a lack of knowledge regarding the effect of TPEE on mechanical and fracture behaviors of short-fiber-reinforced PBT and the effect of its microstructure on the dynamic performance. To study the characteristics of modified short-fiber reinforced PBT and to asse s the effect of the filament, two types of polymers - standard PBT-GF10 and PBT-GF10 blended with 10% TPEE - were compared. Morphological investigation of fracture surfaces produced in tensile tests at different loading rates was undertaken with scanning electron micr sc py (SEM). Further two-dimensio al image analysis was completed with the image processing software ImageJ. The morphological analysis showed that TPE-E generally affected the microstructure of the material. Micrographs of fracture surfaces demonstrated a decrease in the size of area of ductility with increasing loading rate. These results will support the velopment an design of optimized parts and their pr cessing methods. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published b Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V Peer-review under esponsibility of the ECF22 organizers. Keywords: microsctructure; PBT; SEM; fractogra hy; surfac morphology Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: microsctructure; PBT; SEM; fractography; surface morphology

* 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 o ganizers.

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.2018.12.084