Abstract
The effects of mean stress on the fatigue properties of annealed and 50 per cent cold rolled commercially pure titanium sheets were studied on Schenck's vibrating sheet bending machine. The notch effects on the fatigue strength of annealed rods were studied on Ono's rotary bending machine.Following results were obtained:(1) The endurance limit diagram in bending is shown in Fig. 4. To construct a diagram, the experimental points under the mean stress are plotted along a line drawn through the complete reversal stress amplitude and the nominal tensile strength.(2) The relation between theoretical stress concentration factor and fatigue strength reduction factor is shown in Fig. 6.(3) In the case of 3.1 value of theoritical stress concentration factor, the fatigue strength reduction factor of annealed commercially pure titanium rod is approximately the same as that of 14S-T6 and 24S-T4 aluminium alloys.
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