Combined bending-torsion fatigue reliability of AISI 4340 steel shafting with K sub t = 2.34Results generated by three, unique fatigue reliability research machines which can apply reversed bending loads combined with steady torque are presented. Six-inch long, AISI 4340 steel, grooved specimens with a stress concentration factor of 2.34 and R sub C 35/40 hardness were subjected to various combinations of these loads and cycled to failure. The generated cycles-to-failure and stress-to-failure data are statistically analyzed to develop distributional S-N and Goodman diagrams. Various failure theories are investigated to determine which one represents the data best. The effect of the groove and of the various combined bending-torsion loads on the S-N and Goodman diagrams are determined. Three design applications are presented. The third one illustrates the weight savings that may be achieved by designing for reliability.
Document ID
19750032754
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kececioglu, D.
Chester, L. B.
Dodge, T. M. (Arizona, University Tucson, Ariz., United States)
Date Acquired
August 8, 2013
Publication Date
November 1, 1974
Subject Category
Structural Mechanics
Report/Patent Number
ASME PAPER 74-WA/DE-12
Meeting Information
Meeting: American Society of Mechanical Engineers, Winter Annual Meeting