The object of the present tests was to study the effect of Tellus 15 oil and Grade 1 mercury at high pressure, on the fatigue behaviour of a 2½ per cent Ni–Cr–Mo steel, by subjecting thick-walled cylinders to a static internal pressure and push-pull fatigue loading along their longitudinal axis.
In the life range 106 to 107 cycles the fatigue strength of this steel is unaffected by Tellus 15 oil or Grade 1 mercury at ambient pressures up to 32 000 lbf/in2. The reductions in fatigue strength which occurred with increase in static internal pressure can be attributed to the increase in the maximum value of the normal stress on the planes of maximum range of shear stress.
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