The effect of mean shear stress on the fatigue behaviour of thick-walled pressure vessels has been studied by two methods. First, repeated internal pressure tests, with zero minimum pressure, have been carried out on two-component compound cylinders. These tests were designed to show the effect of low mean shear stress on the fatigue behaviour of the inner component (liner). Second, by adjusting the maximum and minimum pressure of the fatigue cycle, monobloc cylinders have been tested with high mean shear stress.
These tests show that in the life range 106 to 107 cycles the fatigue strength of thick-walled cylinders is primarily dependent on the maximum range of bore shear stress and secondarily on the associated mean shear stress. Fatigue strength increases as the mean shear stress decreases. However, a comparison of cylinder, torsion and push-pull fatigue data shows that there must be other, as yet ill-defined, factors that reduce the fatigue strength of cylinders subjected to repeated internal pressure.
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