Abstract
![CDATA[Shaft fatigue crack is one of the most common defects in rotating equipment, due to its extensive operation with continuous heavy loads. Finding an efficient way to evaluate the true stiffness variation due to the crack rotation is the key step to develop both on-line and off-line crack diagnostic techniques. This study analysed time-variant bending stiffness of elastic shafts with experimentally-induced fatigue, welding and wire cut transverse cracks. It was found that crack gap has a significant effect on the opening and closing behaviour of the transverse crack. As in the case of a cut crack, large crack gap could completely prevent the crack from closing during rotation. A fatigue crack without a clear gap shows a typical opening and closing behaviour. Further, it remains fully closed within a small angular range and most of time it is partially closed. It was also observed that both switch and harmonic models cannot describe periodic stiffness variation well enough to represent the actual breathing function of the fatigue crack.]]
Original language | English |
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Title of host publication | Proceedings of the 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), Byron Bay, Australia, 9-12 December 2014 |
Publisher | Southern Cross University |
Number of pages | 6 |
Publication status | Published - 2014 |
Event | Australasian Conference on the Mechanics of Structures and Materials - Duration: 9 Dec 2014 → … |
Conference
Conference | Australasian Conference on the Mechanics of Structures and Materials |
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Period | 9/12/14 → … |
Keywords
- cracks
- shafts
- fatigue
- stiffness
- vibration
- breathing