PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 939–946 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Finite Element Analysis of Fatigue Response of Nickel Steel Compact Tension Samples using ABAQUS Danilo D’Angela 0F * , Marianna Ercolino University of Greenwich, Department of Engineering and Science, Central Avenue, Chatham ME4 4TB, United Kingdom Fatigue is a major issue for critical structures, and it can be very significant for structural systems composed of metal plate-like components. Finite Element (FE) analysis has been proved to be an efficient and reliable simulation tool for damage assessment of plate structures under fatigue. However, this approach is still quite challenging and some issues still need to be fully addressed. The FE models are often extremely complex as well as the required computational costs are frequently high. This study presents the numerical simulation of the fatigue fracture in Nickel steel compact tension (CT) samples by means of FE analysis in ABAQUS. The eXtended Finite Element Method (XFEM) is coupled to the direct cyclic Low-Cycle Fatigue (LCF) approach to address the issues related to ommon modelling of fracture. The fatigue response is implemented by using the well-known Paris law . The model is easy to implement and the analysis does not require high computational time. The numerical crack propagation curves fit the experimental results better than the analytical solution. The umerical assessment of the fatigue life and fracture toughness also agrees with the experimental data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue fracture; Compact Tension; XFEM technology; ABAQUS; fatigue life; © 2018 Th Authors. P blished by Elsevi r B.V. Peer-review und responsibility of the ECF22 organiz rs. ECF22 - Loading and Environmental effects on Structural Integrity Finite Element Analysis of Fatigue Response of Nickel Steel Compact Tension Samples using ABAQUS Danilo D’Angela 0F * , Marianna Ercolino University of Greenwich, Department of Engineering and Science, Central Avenue, Chatham ME4 4TB, United Kingdom Abstract Fatigue is a major issue for critical structures, and it can be very significant for structural systems composed of metal plate-like components. Finite Element (FE) analysis has been proved to be an efficient and reliable simulation tool for damage assessment of plate structures under fatigue. However, this approach is still quite challenging and some issues still need to be fully addr ssed. The FE models are often xtremely complex a well as the req ired computational co ts are frequently high. This study presents t numerical simulatio of the fatigue fracture in Nickel st el compact tension (CT) samples by means of FE analysis in ABAQUS. T eXtended Finite Element Method (XFEM) is coupled to the dire t cyclic Low-Cycle Fatigue (LCF) approach to address the issues relate to common modelling of fracture. The fatigu response is implemented by using the w ll-known Paris law . The model is easy to implement and the analysis does not require hi h com utational time. Th numerical crack propagation curves fit t e exp rim ntal results better than the analytical solution. Th numerical assessment of t e fatigue life and fracture toughness also agrees with the experimental data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue fracture; Compact Tension; XFEM technology; ABAQUS; fatigue life; 1. Introduction Fatigue is a major pro lem for all the ngineering fields and, in particular, for metal structures. Relevant engineering systems such as bridges or planes are often affected by repeated loads and their structural components likely undergo fatigue. Among the many possible failure modes, fatigue is the most common cause of mechanical collapse (Stephens © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Fatigue is a major pr blem for all the eng neering f elds and, in particular, for metal structures. Relevant engineering systems such as bridges or planes are often affected by repeated loads and their structural components likely undergo fatigue. Among the many possible failure modes, fatigue is the most common cause of mechanical collapse (Stephens Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +44 (0) 7447 156365 E-mail address: d.dangela@greenwich.ac.uk * Corresponding author. Tel.: +44 (0) 7447 156365 E-mail ad ress: d.dangela@greenwich.ac.uk

* 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.2018.12.176