PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1595–1599 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Structural integrity assessment of rigid polyurethane components using energy methods Lesiuk G. a* , Junik K. a , Smolnicki M. a , J.A.F.O. Correia b , De Jesus A. M. P. b , Babiarczuk B. a , Otczyk K. a a Department of Mechanics, Materials Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland b INEGI/Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal Abstract In the paper, the experimental results of the mechanical investigation have been presented. The main attention was paid to fracture toughness, tearing resistance and fatigue crack growth rate characterization of polyurethane elastomers in terms of two different hardness configurations; 80ShA and 90ShA. The impact of material hardness on the fracture properties (static and cyclic) is reflected in experimental results. For fracture toughness characterization, the EWF (essential work of fracture) method was involved. It has been shown, that the 80ShA and 90ShA materials demonstrate completely different behavior under high stress concentration condition. From the perspective of usefulness of fracture mechanics, the energy approach seems to be crucial in the context of the real operating conditions of the bushing in suspension system of vehicles. For this purpose the fatigue crack growth rate test was performed on planar specimens PS (Pure Shear). Based on the experimental results, it can be concluded that fatigue crack growth rate in 90ShA PUR elastomer was significantly higher in comparison to the 80ShA PUR elastomer. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: polyurethane elastomers; static properties; teari g energy; fatigue crack growth rate; ECF22 - Loading and Environmental effects on Structural Integrity Structural integrity assessment of rigid polyurethane components using energy methods Lesiuk G. a* , Junik K. a , Smolnicki M. a , J.A.F.O. Correia b , De Jesus A. M. P. b , Babiarczuk B. a , Otczyk K. a a Department of Mechanics, Materials Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50-370 Wrocław Poland b INEGI/Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal Abstract In the paper, the experimental results of the mechanical investigation have been presented. The main attention was paid t fracture tough ess, tearing resistance and fatigue crack growth rate characterization of polyurethane elastomers in terms of two different hardness configuratio s; 80ShA and 90ShA. The impact of material hardness on the fracture pr perties (static an cyclic) is reflected in experimental results. For fracture toughness characterization, the EWF (essential work of fracture) method was involved. It has been shown, that the 80ShA and 90ShA materials demonstrate completely different behavior under high stress c centration condition. From the perspectiv of usefulness of fracture mechanics, the energy approach seems to be crucial in the context of the real operating conditions of the bushing in suspension system of vehicles. For this purpose the fatigue crack growth rate test was performed on planar speci ens PS (Pure Shear). Based on the experimental results, it can be concluded that fatigue crack growth rate in 90ShA PUR elastomer was significantly higher in comparison to the 80ShA PUR elastomer. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: polyurethane elastomers; static properties; tearing energy; fatigue crack growth rate;

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

1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Polyurethane (PUR) material is a commonly used material, as a rubber replacement, in suspension system of vehicles (Fig. 1). The knowledge about static and cyclic behavior of this materials with consideration of the manufacturing discontinuities or fatigue cracks behavior is limited. The classical fracture toughness tests are not suitable to the nonlinear and visco-elastic behavior of such a type materials like rubber or rubber-similar elastomers. Polyurethane (PUR) material is a commonly used material, as a rubber replacement, in suspension system of vehicles (Fig. 1). The knowledge about static and cyclic behavior of this materials with consideration of the manufacturing discontinuities or fatigue cracks behavior is limited. The classical fracture toughness tests are not suitable to the nonlinear and visco-elastic behavior of such a type materials like rubber or rubber-similar elastomers.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 201 8 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 201 8 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

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.2018.12.336