PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 14 (2019) 384–394 Available online at www.sciencedirect.com Science irect 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. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect f Elev ted Temp ratures on the Mechanical Properties f Concrete Anupama Krishna.D a , Priyad rsini R S b , Narayanan S c * a Reserach Scholar,Department of Civil Engineering College of Engineering, Trivandrum 695016, Kerala,India b Professor, Department of Civil Engineering, College of Engineering, Trivandrum 695016 , Kerala, India c Prof. & Head of Department, Department of Civil Engineering, Mohandas College of Engineering, Trivandrum 695544, Kerala, India Abstract Cement concrete is widely used as structural material in building construction where fire resistance is one of the key considerations in design. High temperature is well known for seriously damaging micro- and meso-structure of concrete, which results in a generalised mechanical decay f the concrete and ev n detrimental effects at the structural level, due to the concr te spalling and bar exposure to the flames, in case of fire. Concrete, at elevated tempera ures undergoes significant physico chemic l changes. Fire response of the concrete structural members is depend on t e thermal, mechanical, and deformation prop rties of concrete. The aim of this work is to investigate the ffect of elevated temperature on the mechan cal properties of concrete. The mech nical properti s of concrete tha are of primary i terest in fire resis ance d sign are compressive strength, tensile strength, elastic modulus, and the stress-strain r sponse in compression. To study th e, cubes and cylinders of tandard size have been casted and subjected to elevated temperature of different regimes from 100 o C to 1000 o C in an electric heating furnace and then tested. The values thus obtained have been compared with the values in Eurocode (EN 1991-1-2), ASCE (American Society of Civil Engineers) and Published literature Keywords: Concrete Spalling; Elevated temperature; Elastic Modulus; Stress – Strain response 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Elevated Temperatures on the Mechanical Properties of Concrete Anupama Krishna.D a , P iyadarsini R S b , Nar yanan S c * a Reserach Scholar,Department of Civil Engineering Colleg of Engineering, Trivandrum 695016, Kerala,India b Professor, Department of Civil Engineering, College of Engineering, Trivandrum 695016 , Kerala, India c Prof. & Head of Department, Department of Civil Engineering, Mohandas College of Engineering, Trivandrum 695544, Kerala, India Abstract Cement concrete is widely used as structural material in building construction where fire resistance is one of the key considerations in design. High temperature is well known for seriously damaging micro- and meso-structure of concrete, which results in a generalised mechanical decay of the concrete and even detrimental effects at the structural level, due to the concrete spalling and bar exposure to the flames, in case of fire. Concrete, at elevated temperatures undergoes significant physico che ical changes. Fire response of the concrete structural members is dependent on the thermal, mechanical, a d deformation properties of co cr te. The aim of this work is to investigate the effect of elevated temperature on the mechanical prop rties of concrete. Th mechanical properties of concrete that ar of primary inter s in ire resis ance design are compressiv strength, tensile strength, elastic modulus, an the stress-strain response in compression. To study thes , cub s and cyli ders of stand rd siz have bee casted and subj cted to elevated temper ture of differ nt r gimes from 100 o C to 1000 o C n an electric he ng furnace and then t sted. The values thus obtained have b en compared wit he valu s in Eurocode (EN 1991-1-2), ASCE (Amer can Society of Civil En ine rs) and Published literature Keywords: Concrete Spalling; Elevated temp ratur ; Elastic Modulus; Stress – Strain response 1. Introduction Thermal properties of concrete are more complex than those of many other materials because not only is the concrete a composite material whose constituents have different properties, but its properties also depends on © 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.

1. Introduction

Thermal properties of concrete are more complex than those of many other materials because not only is the concrete a composite material whose constituents have different properties, but its properties also depends on

* Corresponding author. Tel.: +919961140744. E-mail address: hodcivil@mcetonline.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.047 2452-3216© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt * Corresponding author. Tel.: +919961140744. E-mail address: hodcivil@mcetonline.com