Abstract
As the screw threads profile to improve the fatigue strength, ISO high fatigue resistance screw threads profile has been proposed. This profile is as follows : nut threads have ISO general purpose screw threads profile, and bolt threads have the flank angle modification of +5°in the pressure flank and the pitch modification of -0.15%. This paper deals with the theoretical and experimental analyses on the screw threads profiles to improve the fatigue strength, taking ' account of the above ISO proposal. The obtained conclusions are as follows : (1) From the analysis by the finite element method it is found that the improvement of fatigue strength of screw threads is expected by the pitch modification, but not by the flank angle modification. (2) From the fatigue experiments with the bolts 10 mm in nominal diameter and 12. 9 in strength grade, it is found that the pitch modification shows a significant effect on the improvement of the fatigue strength, while the flank angle modification does not.
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