The endurance limit () is the maximum stress amplitude that a material can withstand under cyclic loading without experiencing fatigue failure over an infinite number of cycles. The formula for calculating the endurance limit of a material is typically expressed as:
where:
-
- = Endurance limit or fatigue limit (in pascals, Pa)
- = Ultimate tensile strength of the material (in pascals, Pa)
- = Factor of safety for fatigue (unitless)