Failure analysis of a tool steel torque shaftA low design load drive shaft used to deliver power from an experimental exhaust heat recovery system to the crankshaft of an experimental diesel truck engine failed during highway testing. An independent testing laboratory analyzed the failure by routine metallography and attributed the failure to fatigue induced by a banded microstructure. Visual examination by NASA of the failed shaft plus the knowledge of the torsional load that it carried pointed to a 100 percent ductile failure with no evidence of fatigue. Scanning electron microscopy confirmed this. Previously announced in STAR as N82-11184
Document ID
19840034759
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Reagan, J. R. (NASA Lewis Research Center Cleveland, OH, United States)