Browsing by Author "Semihar, Ayalew"
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Item Fracture Analysis of Shaft due to the Second Higher Critical Speed (Vibration) for AISI 1018 Steel Shaft(Addis Ababa University, 2021-03) Semihar, Ayalew; Samuel (PhD)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.