PSI - Issue 10

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 1 (2018) 1 4–111 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. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://cr ativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Investigating the fracture behavior of Portland limestone: an experimental study A. Marinelli*, M.R. Stewart School of Engineering and the Built Environment, Edinburgh Napier University, Merchiston Campus, EH10 5DT Edinburgh, Scotland Abstract An experimental investigation of the mechanical and fracture characteristics of the ‘Grove Whitbed’ Portland limestone is under taken aiming to enhance understanding of the structural behavior of this natural building stone, commonly used in both new and res toration projects in Edinburgh, Scotland. A series of prismatic specimens, bearing a machined notch at their mid-span and com prising combinations of three different geometries (span/depth ratios) and three different sizes (span lengths) were subjected to three point bending testing. The effect of specimen shape and size on flexural strength, deflection at mid-span, crack mouth opening dis placement (CMOD) and fracture energy was studied. Despite the scattering of results which is significant but common in studies of the mechanical behavior of similar geomaterials, trends observed comprise (a) the negative correlation between the flexural strength of Po tland limestone test specimens and their span lengths for all three shapes and (b) the positive correlati n be ween fracture en rgy and specimen siz . Conclusions drawn are in good agreement with imilar ones for other quasibrittl materials and contribut to the assessment of the fra ture b havior of full size structural m mb rs that are often beyond the range of p ssible failure t sting. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Keywords: Natural building stones; Portland limestone; mechanical properties; size effect; shape effect; fracture energy i e c e t the Greek Society of Experimental Mechanics of Materials Keywords: Natural building stones; Portland effect; fracture en

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Scotland’s istoric nvironment is an essential par of the country’s cultural background and its economy. Scotland has a long history of building with stone and is one of the countries with the richest legacies of traditional and historic

* Corresponding author. Tel.: +44 131 455 2553 E-mail address: A.Marinelli@napier.ac.uk Received: April 19, 2018; Received in revised form: July 08, 2018; Accepted: July 12, 2018

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 Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.016 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials st * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt