PSI - Issue 13

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 204 –2 47 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 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 Steam turbine moving blade failure caused by corrosion fatigue – case history Marko Katinić a , Dražan Kozak a a Mechanical engineering faculty in Slavonski Brod, Trg Ivane Brli ć Mažurani ć 2, Slavonski Brod 35000, Croatia Abstract Corrosion fatigue has been identified as one of the leading causes of steam turbine rotor blades failure. Despite of numerous research and development in the area of preventing sudden rotor blades failure due to corrosion fatigue, in the practice these failures continue to occur. This paper just describes one of number historical cases of rotor blade fracture that was caused by corrosion fatigue. It was an industrial turbine installed in fertilizer production plant Petrokemija Kutina, Croatia. The broken blades were belonged to the turbine stage located in the phase transition zone (salt zone) of the turbine. The paper also describes the analysis of the failure cause and the modification of the turbine stage that was failed. © 2018 The Authors. Publishe by Elsevier B.V. Peer-review under res on ibility of the ECF22 organizers. Keywords: corrosion fatigue; steam turbin ; balde; failure 1. Introduction It is well known that catastrophic failure of a steam turbine, large or small, can cause serious injury or even death, result in the total loss of the machine, shut down the plant for an extended period, and be a public relations nightmare. Failures of turbine rotor blades have b en identified as the leading causes of unplanned outages for steam turbine. Blade failure sually occurs as a result of corrosi n fatigue. Despite of numerous research and development in the area of preventing sudden rotor blades failure due to corrosion fatigue (Schönbauer et al. (2012), Salzma et al. (2013), Schönbauer et al. (2014)), in the practice these failures continue to occur. This paper presents one of number historical cases of rotor blade fracture that was caused by corrosion fatigue. It was an industrial turbine installed in fertilizer production plant Petrokemija Kutina, Croatia. The steam turbine drives a process air compressor that is a vital part of ammonia plant. The paper also describes the analysis of the failure cause and the modification of the turbine stage that was failed. ECF22 - Loading and Environmental effects on Structural Integrity Steam turbine moving blade failure caused by corrosion fatigue – case history Marko Katinić a , Dražan Kozak a a Mechanical engineering faculty in Slavonski Brod, Trg Ivane Brli ć Mažurani ć 2, Slavonski Brod 35000, Croatia Abstract Corrosion fatigue has been identified as one of the leading causes of steam turbine rotor blades failure. Despite of numerous research and development in the area of preventing sudden rotor blades failure due to corrosion fatigue, in the practice these failures c ntinue to occ r. This paper just d scribes one of number historical cas s of rotor blade fracture that was caused by corrosion fatigue. It was an industrial urbin installed in fertiliz r production pl nt Petrokemija Kutina, Croat a. The brok n blades were belonged to the turbine st g loca e in the phase tra sition zone (salt zone) of the tu bine. The pap r also describes the analysis f the failure cause and the modification of th turbine stage that was failed. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. K ywords: corrosion fatigue; steam turbine; balde; failure 1. Introduction It is well known that catastrophic failure of a steam turbine, large or small, can cause serious injury or even death, result in the total loss of the machine, shut down the plant for an extended period, and b a public relations nightmare. Failur s of turbine rotor blades have been identifie as the l ading causes of unplanned outages for steam turbine. Blade failure usually occurs as a result of corrosion fatigue. Despite of numerous research and development in the area of preventing sudden rotor blades failure due to corrosion fatigue (Schönbauer et al. (2012), Salzma et al. (2013), Schönbauer et al. (2014)), in the practice these failures continue to occur. This paper presents one of number historical cases of rotor blade fracture that was caused by corrosion fatigue. It was an industrial turbine installed in fertilizer production plant Petrokemija Kutina, Croatia. The steam turbine drives a process air compressor that is a vital part of ammonia plant. The paper also describes the analysis of the failure cause and the modification of the turbine stage that was failed. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 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 responsibility of the ECF22 organizers.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.211

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