A special combined stress pulsator is described which was used to subject thin-walled cylindrical tubes to various ratios of combined (in phase) pulsating stresses. The material investigated was annealed SAE-1020 steel. Stress ratios in both the (+, +) and the (+, −) quadrants were applied. In addition, tension tests and uniaxial completely reversed rotating bending fatigue tests were made in the axial and tangential directions to study the anisotropy of the material. The combined stress-fatigue tests agreed best with the distortion-energy theory of strength.

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