A new method is presented to obtain the effect of mean stress components in high-cycle, biaxial fatigue. It is assumed that the time-varying stress state can be represented as a superposition of mean components, and proportionally applied alternating components. The method takes into account the relative orientation of the mean and alternating principal stress axes by making the ‘equivalent mean stress’ depend on the alternating components as well as the mean stress components. The method correlates well with the available data. The new method is compared with three popular methods.
MundayE. G. and MitchellL. D., ‘The maximum distortion energy ellipse as a biaxial fatigue criterion in view of gradient effects’, Experimental Mechanics, 29(1) (1989), 12–15.
2.
ShigleyJ. E. and MischkeC. R., Mechanical Engineering Design, 5th edition (McGraw-Hill, New York, 1989).
3.
SinesG., Failure of Metals Under Combined Repeated Stresses with Superimposed Static Stresses (NACA Tech., Note 3495, 1955).
4.
JuvinallR. C. and MarshekK. M., Fundamentals of Machine Component Design, 2nd edition, (Wiley, New York, 1991).
5.
GoughH. J.PollardH. V. and ClenshawW. S., Some Experiments on the resistance of Metals to Fatigue Under Combined Stresses (Ministry of Supply, Aeronautical Research Council Reports and Memoranda, His Majesty's Stationery Office, London, 1951).
