PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1644–165 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Behavior Determining of Bucket Wheel Drive Depending on the Wear Impact of the Cutting Elements Filip Miletić a , Predrag Jovančić a , Svetan Djenadić a a Faculty of Mining and Geology, University of Belgrade, 11120 Belgrade, Serbia Abstract The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. Due to the toothed teeth, the resistance to digging also increases, and in this connection there is an increased load on the gear unit, and the whole construction f he subsystem of digging. Finally, this results in a change in the mode of operation of the excavator, there is a reduction in its capacity, which negatively affects the economic effects of production. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: rotor xcavator, buck t wheel drive, cutting lements 1. Introduction On the surfa e min s in Serbia, as a basic mechanizatio for the continuous removal of waste material and coal, rotor excavators ar used. Because to the characteristic compos tion of the mat ri l, the buckets at the rotor whe l are equipped with cutting el ments. Exploitation conditions for the teeth on the rotor excavator that are in direct contact with the working environment that are digging are very difficult and complex. During operation, cutting elements are exposed to intensive abrasive wear and variable dynamic load. This leads to the progressive wear of the teeth, and in severe cases to its deformation or breakage. At that time, the teeth can not properly perform its basic function, which directly and indirectly reflects the capacity, load and power consumption of the excavator. As a result, the economic effects of coal production are reduced, along with the increase in costs, due to the time lag of the excavator and the replacement of the cutting elements. Costs due to the process of wearing the materials of cutting elements cannot be eliminated, but they can be significantly reduced. To perform buckets and teeth optimization, the first step is to have a good knowledge of the physical and mechanical characteristics of the material being excavated, knowledge of the specific resistance of the digging material and its compliance with the available digging power. The second step in the ECF22 - Loading and Environmental effects on Structural Integrity Behavior Determining of Bucket Wheel Drive Depending on the Wear Impact of the Cutting Elements Filip Miletić a , Predrag Jovančić a , Svetan Djenadić a a Faculty of Mining and Geology, University of Belgrade, 11120 Belgrade, Serbia Abstract The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the corre t and sharp teeth when the ca acity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. Due to the toothed teeth, t resistance to digging also increas s, and in this connection there is an increased lo d on the gear u t, and the whole cons ruction f the subsystem of igging. Finally, this result in a change in th mode of operati n of the xcavator, there is a reducti in its capaci y, which n gatively affects the economic effects of production. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: rotor excavator, bucket wheel drive, cutting elements 1. Introduction On the surface mines in Serbia, as a bas c mechanizati n for the continuous removal of waste ma erial and coal, rotor excavators are us d. Because to the characteristic composition of t m terial, the buck ts at the rotor wheel are equipped with cutting elements. Exploitation conditions for the teeth on the rotor excavator that are in direct contact with the working environ ent that are digging are very difficult and c mplex. During operation, cutti g elements are exposed to intensive abrasive wear and variable dynamic load. This leads to the progressive wear of the teeth, and in severe cases to its deformation or breakage. At that ti e, the teet can not properly perform its basic function, which directly and indirectly reflects the capacity, load and power consumption of the excavat r. As a result, the economic effects of coal prod ction are re uced, along with the increase in costs, due to the time lag of the excavator a d the replacement of the cutting elements. Costs due to the process of wearing the materials of cutting elements can ot be eliminated, but t ey can be significantly reduced. To perform buckets and teeth optimization, the first step is to have a good knowledge of the physical and mechanical characteristics of the material being excavated, knowledge of the specific resistance of the digging material and its compliance with the available digging power. The second step in t e © 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.

* 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.2018.12.345