With the object of investigating the problem of very short life fatigue, the effect of atmospheric, 22 400, and 44 800 lbf/in2 pressures were investigated when the diametral mean strain of the strain cycle was in the range of–5 to +20 per cent. A new test apparatus was designed and developed for this purpose.
It was found that large hydrostatic pressure produced an increase in the short life fatigue strength of the metal. The advantageous effect of the fluid pressure was greater in short life than in the long life fatigue. The strain hardening and softening characteristic of the metal used appears to be independent of the surrounding pressure and depends on the relative values of the applied mean strain and cyclic strain range. The effect of the rate of straining on short life fatigue in the range of 1·7–72 per cent diametral strain per minute and the effect of environment (air or liquid paraffin) was found to be negligible.
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