PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 2 (2016) 549–556 Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Visualization of Dam ges of the Main Pipelines Using Cyclic Hydro Testing Oleksandra Student a, *, Halyna Krechkovs ’ ka a a Karpenko Phisico-Mechanical Institute of the National Academy of Sci ncies of Ukraine, 5, Naukova Str., Lviv, 79601, Ukraine The fracture of the pipelines is often occurred in the vicinity of weld joints. It is important to consider the scattered damages in the bulk material and their effect on the mechanical properties. These damages could be visualized by hydro testing of long-term exploited pipes with following fractography investigation of the obtained fracture surfaces. The bulk damages of 10G2C1 steel after 45 years of operation on the pipeline were analyzed using mechanical characteristics of metal and fractography features of fracture. Strength and ductility characteristics, impact toughness of the exploited steel (as a base metal) and metal from different zones of longitudinal weld joint on the pipe were analyzed. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: pipelines; steel; fractography analysis; damage; fracture; mechanical properties. 1. Introduction Hydro stress testing of pipelines is aimed to the checking of their tightness. Hydro stress testing of isolated section of the pipeline is carried out at a pressure greater than the working one in 1.5 times. The pipeline is considered to be hermetic if the pressure water in the pipe remains unchanged during 0.5...6 hours. As a rule the fracture of pipelines is occurred in the vicinity of weld joints (WJ) (Nykyforchyn et.al. (2004)). Studying the real pipe damages enables us to identify the points of cracks initiation, and mechanism and energy intensity of their propagation, to reveal the causes of their appearance and qualitatively estimate the crack growth kinetics (Hull 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Visualization of Damages of the Main Pipelines Using Cyclic Hydro Testing Oleksandra Student a, *, Halyna Krechkovs ’ ka a a Karpenko Phisico-Mechanical Institute of the National Academy of Sciencies of Ukraine, 5, Naukova Str., Lviv, 79601, Ukraine Abstract The fracture of the pipelines is often occurred in the vicinity of weld joints. It is important to consider the scattered damages in the bulk material and their effect on the mechanical properties. These damages could be visualized by hydro tes ing of long-term exploited pipes with following fractography investigation of the obtained fracture surface . The bulk damag s of 10G2C1 steel after 45 years of operati n o the pipeline were analyzed using mecha ical characteristi s of m tal an fractography features of fracture. Strength and ductility characteristics, imp ct toughness of t e exp oited st el (as a base metal) and met l from diff rent zones of longitudinal weld joint on the pipe were analyzed. © 2016 The Authors. Published by Elsevier B.V. Peer-review under respons bility of the Scientific Committee of ECF21. Keywords: pipelines; steel; fractography analysis; damage; fracture; mechanical properties. 1. Introduction Hydro stress testi g of pipelines is aimed to the ch ck ng of their tightness. Hydro stress testing of isolated section f h pipel e is carried out at a pressur gr ater than worki g one in 1.5 times. The pipeline is considered to be h rm t c if th pressure water in the pip remains unchanged during 0. ...6 hours. As a rule the fractur of pipelines is oc urred in the vicinity of weld joints (WJ) (Nykyforchyn et.al. (20 4)) Studying the rea pip d mag s enables us t identify t po ts f cracks itiation, and me a ism and energy intensity of their prop atio , to reveal the causes of the r appearan e a d qualitatively stimate the crack rowth kinetics (Hull Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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. Abstract

* Corresponding author. Tel.: +38-032-229-6213; E-mail address: student@ipm.lviv.ua * Corresponding author. Tel.: +38-032-229-6213; E-mail address: student@ipm.lviv.ua

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.071