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Definitions

Endurance Limit

As the alternating stress gets smaller, the material can take more stress cycles before it fails due to fatigue. The endurance limit is the highest alternating stress that does not result in fatigue failure. In other words, if the alternating stress is equal to or lower than the endurance limit, the number of stress cycles to cause failure becomes very large (practically infinite). The endurance limit is usually defined for zero-mean alternating stresses. The endurance limit is also called the fatigue limit. Some metals do not have a measurable endurance limit.

Alternating Stress

The alternating stress is defined as (s max - s min)/2 where s max and s min are the maximum and minimum stresses respectively.

Stress Range

Stress =  (smax - smin)

Mean Stress

Mean stress = Sm = (smax + smin)/2

Mean stress correction

Stress Ratio

Stress ratio =  smin/smax

Fatigue Life

Fatigue life, at a given alternating stress level and mean, is the number of cycles required to cause failure due to fatigue.

Fatigue Strength

The stress at which fatigue failure occurs after a given number of  loading cycles.

Related Topics

Fatigue Analysis

Fatigue Events

Performing Fatigue Analysis

Fatigue Plots



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