Indicates the anticipated number of applications of this load on the system for load cases using the Expansion (EXP) or Fatigue (FAT) stress types. The value is typically in the thousands or greater.
The software uses the Load Cycles value to determine the allowable stress from the fatigue curve for the material or the cyclic stress range reduction factor F1, F2, ... F9 for an EXP case. The value calculated from Load Cycles overrides the value defined for F1, F2, ... F9.
When a value is not defined, the software assumes the model has no reduction and uses a default value of 7000 for Load Cycles, equivalent to a cyclic stress range reduction factor F1, F2, ... F9 of 1.0.
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For static cases, the software calculates stresses at full range.
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For dynamic cases, the software calculates stresses at half range, which is the amplitude of the full stress range.
B31.1 only
For B31.1 load cases with an Expansion (EXP) stress type, you can define Load Cycles as 1.0 to indicate that the stress range is caused by noncyclic support movements. In this situation, the software replaces the allowable stress range value, Sa, with a special noncyclic allowable calculation according to the B31.1 code. The software continues to calculate the displacement stress range, Se.