PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1828–1833 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

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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 Fracture analysis of axially flawed ring-shaped bending specimen Walid Musrati a , Bojan Medjo a , Nenad Gubeljak b , Primož Štefane b , Darko Velji ć c , Aleksandar Sedmak d , Marko Rakin a, * a University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade 11000, Serbia b University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, Maribor 2000, Slovenia c IHIS Techno Experts Research & Development Center, Batajni č ki drum 23, Belgrade 11000, Serbia d University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade 11000, Serbia *marko@tmf.bg.ac.rs Application of pipelines is common in process industry and energetic facilities, as parts of storage and transport systems. Structural integrity and fracture resistance of the pipeline elements is typically assessed by testing fracture mechanics specimens, like compact tensile CT or single-edge notched bending, SENB. However, fabrication of these geometries is often not possible for thin-walled pressurized elements, commonly used in structures of process and energetic facilities. Therefore, some proposals for non-standard specimens have been given in the literature, differing by the position of the initial defects, in circumferential or axial direction, and by the degree of complexity of procedures for fabrication and testing. Recently proposed ring-shaped specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture resistance of pressurized cylinders with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or exploitation conditions. In this work, the ring specimens are cut from the thin-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testing and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels. ECF22 - Loading and Environmental effects on Structural Integrity Fracture analysis of axially flawed ring-shaped bending specimen Walid Musrati a , Bojan Medjo a , Nenad Gubeljak b , Primož Štefane b , Darko Velji ć c , Aleksandar Sedmak d , Marko Rakin a, * a University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade 11000, Serbia b University f Maribor, Faculty of Mechanical Engin ering, Smetanova 17, Maribor 200 , Sloveni c IHIS Techno Experts Research & Development Cent , Batajni č ki drum 23, Belgrade 1100 , Serbia d University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, Belgrade 11000, Serbia *marko@tmf.bg.ac.rs Abstract Application of pipelines is common in process industry and energetic facilities, as parts of storage and tr sport system . Stru tural integrity and fracture r sistance of the pipeline elements is typically assessed by testin fracture mechanics specimens, like comp ct tensile CT or singl -edge notched ben ing, SENB. H wever, fabrication of these geometries is often not possible thi -w lled pressuriz d elements, commonly used in st uctures of process and energetic facilities. Therefore, so e proposals for non-standard specimens hav been giv n in the literat , differing by the positio of the initial defects, in circumferential or axial directi n, and by the degree of complexity of procedures for fabrication and testing. Recently propose ing-shap d specimen (PRNB - Pipe Ring Notched Bend) is used here to assess the fracture r sistanc of pressurized cylind rs with defects in axial direction, critical for the internal pressure loading. The specimens are simple to fabricate and have the same material history as the actual structure, such as thermo-mechanical treatment, assembly or e loitation conditions. In this work, the ring specimens are cut from the t in-walled non-alloy steel pipes for pressure purposes. Experimental-numerical procedure is applied for prediction of fracture behavior. The methods include material characterization, fracture testin and micromechanical analysis of specimen failure. The results obtained so far lead to conclusion that PRNB specimen is a good option for testing of fracture resistance of pipelines and small-scale vessels. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsib lity of the ECF22 organizers. Keywords: Ductile fracture; Steel pipes; Stress concentrator; Micromechanical analysis. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Ductile fracture; Steel pipes; Stress concentrator; Micromechanical analysis. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th Authors. Published by Elsevie B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 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.2018.12.333