Fatigue dimples? – Fractured bulkhead ring bolts in a large gas turbine engine
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M. Giller
Madeleine Giller Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.Erhan Cagliyan trained as a state-certified technical assistant for metallography and physical material analysis at the Lette-Verein in Berlin. He has been working in the laboratory of the Siemens gas turbine plant in Berlin for 6 years, where his work focuses on fibre analysis, quantitative image analysis, microstructure characterisation with the field emission scanning electron microscope and X-ray fluorescence analysis.
Abstract
Bulkhead ring fasteners, four in total, were found fractured in a large gas turbine engine after 1700 operating hours and a high number of engine starts and shut-downs for such a relatively short time in service. A metallurgical failure investigation was ordered by the client for determining the metallurgical cause of the cracking. The subject bolts failed due to high-stress low cycle fatigue fracture.
Kurzfassung
In einer Großgasturbine wurden nach 1700 Betriebsstunden und einer für diese relativ kurze Betriebszeit hohen Anzahl von An- und Abfahrvorgängen Risse in insgesamt vier Befestigungsschrauben des Schottblechs festgestellt. Der Kunde ordnete eine metallurgische Schadensuntersuchung an, um die metallurgische Ursache für die Risse zu ermitteln. Die betreffenden Schrauben versagten aufgrund von Ermüdungsbrüchen bei hoher Belastung und niedrigen Zyklen.
About the authors
Madeleine Giller Apprenticeship as a materials testing technician at the welding institute SLV Berlin-Brandenburg. After that, she studied materials science at the Berlin Institute of Technology. She graduated with a masters degree in materials science in 2012. Since November 2012 employment as engineer at the Metallography Laboratory of the Siemens Gas Turbine Works in Berlin. She has been appointed laboratory manager within the Berlin Testing Center of the Large Gas Turbine Engineering Group in 2014. Her main fields of expertise comprise failure analysis and microstructural investigations using the field emission scanning electron microscope.
Erhan Cagliyan trained as a state-certified technical assistant for metallography and physical material analysis at the Lette-Verein in Berlin. He has been working in the laboratory of the Siemens gas turbine plant in Berlin for 6 years, where his work focuses on fibre analysis, quantitative image analysis, microstructure characterisation with the field emission scanning electron microscope and X-ray fluorescence analysis.
References / Literatur
[1] Neidel, A.; Cagliyan, E.; Giller, M.: Metallurgical Failure Investigation of Bulkhead Ring #1 Fractured Bolts in ... Large Gas Turbine Engine. Internal report BLN MT/2022/0238a. Berlin, July 29, 2022.Search in Google Scholar
[2] Curtin, B.: Personal communication, July 19, 2022.Search in Google Scholar
[3] Bettge, D. et al.: Yearly session of AG Frakto, BAM Berlin, November 19, 2021.Search in Google Scholar
[4] Griebel, A.: Technical Brief: Fatigue Dimples. J Fail. Anal. and Preven. (2009) 9, pp. 193–196. 10.1007/s11668-009-9228-zSearch in Google Scholar
[5] Neidel, A.; Giller, M.: Material Behaviour of High Temperature Materials – Case Studies on Component Failure Analysis of High Temperature Failures. Keynote lecture, MPA-Seminar, October 10, 2023, Stuttgart, Germany.Search in Google Scholar
[6] Neidel, A.: Interdisziplinäre Schadensanalyse. Kolloquium, Bundesanstalt für Materialforschung und -prüfung, Berlin, 15.03.2023.Search in Google Scholar
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- Imaging of microcrack propagation in 3D nanostructures applying laboratory nano-XCT
- Specimen preparation for atom probe tomography
- FIB/SEM serial sectioning as a versatile tool for microstructural analysis
- Failure Analysis
- Fatigue dimples? – Fractured bulkhead ring bolts in a large gas turbine engine
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Imaging of microcrack propagation in 3D nanostructures applying laboratory nano-XCT
- Specimen preparation for atom probe tomography
- FIB/SEM serial sectioning as a versatile tool for microstructural analysis
- Failure Analysis
- Fatigue dimples? – Fractured bulkhead ring bolts in a large gas turbine engine
- Picture of the Month
- Picture of the Month
- People
- Interview with Prof. Ehrenfried Zschech
- News
- Sicherheit, Effizienz und Nachhaltigkeit in der Wasserstoffwirtschaft
