For any particular value of the mean stress it is possible to determine an SIN
graph. When the mean stress is zero the fatigue limit that is given is that which
occurs in the absence of any stress, however when the mean stress is tensile
strength for the material, then the fatigue limit is zero since the material fails
without any cycles being undertaken. Between these two limits of mean stress,
increasing the mean stress decreases the fatigue limit. A number of empirical
relationships have been devised to describe the relationship between fatigue
limit and the mean stress.
-Fatigue limit with
zero mean stres ...
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