A crankshaft of a bulldozer whose crankcase had been repaired and reassembled cracked in a strange manner when test running was performed for only 20 min. Four cracks were found on the edge of the oil hole. Using mechanical analysis, microstructure and metallurgy the reason of this event has been revealed. Force of friction caused by improper crankshaft repair and assembling is main factor of the failure. Why friction occurs, how the crack initiates and expands and what the process of failure is were studied. The crankshaft cracked by shearing stresses, caused by unusual friction between the surface of the shaft and the main bush. Friction can cause slip on the surface of friction boundary, especially when the temperature goes up to a critical level. This critical temperature may lead to temper brittleness.
Analysis of an unusual crankshaft failure
Engineering Failure Analysis ; 12 , 3 ; 465-473
2005
9 Seiten, 15 Bilder, 1 Tabelle
Aufsatz (Zeitschrift)
Englisch
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