Fracture Analysis of Shaft due to the Second Higher Critical Speed (Vibration) for AISI 1018 Steel Shaft
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Date
2021-03
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Addis Ababa University
Abstract
This paper was devoted to analyze fracture of shaft failure due to the second higher
critical speed for AISI 1018 steel shaft. In this particular research, the influence of
transverse cracks in a rotating shaft was analyzed by comparing with the un-cracked
shaft which deflects at the second higher critical speed. The paper addressed the two
distinct issues of the changes in critical speed and the influence of crack on dynamic
response of shaft during operation. Moreover, the evolution of catastrophic failure of
a cracked rotor near the second higher resonance frequency was investigated.
Numerical calculation was made to calculate the critical speed and other dynamic
fracture parameters. ABAQUS was used to present the simulation result. The research
utilized whirling machine for experimental investigation to find out the critical speed
and the crack developed at the shaft. For homogeneity confirmation SPECTRO
MAXX was employed.
The dynamic response obtained from simulation and experimental investigation was
compared with those evaluated through numerical integration. It was observed that the
critical speed of the cracked shaft decreases by 8.2% and 6.93%. Combined mode I &
III of crack had been seen in the shaft.
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Keywords
Critical Speed, dynamic fracture, whirling of the shaft, AISI 1018 steel shaft, SPECTRRO max, ABAQUS