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Non-Destructive Pressure Pulse Examination for Fatigue Crack Detection in Hydraulic Components

Michiels, Lukas ORCID iD icon 1; Geimer, Marcus 1
1 Institut für Fahrzeugsystemtechnik (FAST), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The growth of fatigue cracks in hydraulic components limits their lifetime. In consequence, many components are oversized for their operating life to prevent crack growth and premature component failures. As an alternative, condition monitoring prevents machine downtime by closely monitoring the components’ state of life. However, due to the harsh operating conditions of hydraulic components, detecting fatigue cracks is difficult. We propose a new approach for non-destructive crack detection that employs a pressure pulse with a high drop rate while measuring the component’s deformation. The oil has to flow out for a fatigue crack to close, which delays the closing of the crack. In consequence, an existing crack causes an offset between the load pressure and the mechanical strain. The offset is measured in order to detect possible cracks. We demonstrate the approach on a test specimen with single-grid linear strain gauges. In our experiments, the offset reached up to 5%. The magnitude of the offset increases with the crack length and can be used as an indicator or threshold in condition monitoring. In addition to a possible online assessment, the proposed approach can be utilized on test rigs as an inspection method or for trial runs.


Zugehörige Institution(en) am KIT Institut für Fahrzeugsystemtechnik (FAST)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 17.11.2023
Sprache Englisch
Identifikator ISBN: 978-0-7918-8743-1
KITopen-ID: 1000164710
Erschienen in Proceedings of the ASME/BATH 2023 Symposium on Fluid Power and Motion Control, Sarasota, 16th-18th October 2023
Veranstaltung ASME/BATH Symposium on Fluid Power and Motion Control (FPMC 2023), Sarasota, FL, USA, 16.10.2023 – 18.10.2023
Verlag The American Society of Mechanical Engineers (ASME)
Seiten Art.-Nr.: 110728
Serie Fluid Power Systems Technology
Schlagwörter Crack detection, Fault analysis, Condition monitoring, Non-Destructive Testing
Nachgewiesen in Dimensions
Scopus
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