Fatigue Capabilities in Dynamic Analysis - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Fatigue analysis capability is also available for harmonic and dynamic analyses. Harmonic load cases are entered as they always have been. They can be designated as being stress type FAT by entering the number of expected load cycles on the harmonic input dialog box:

This produces the same types of reports as are available for the static analysis. They can be processed as discussed earlier.

The only difference between the harmonic and static fatigue analyses is that for harmonic jobs the calculated stresses are assumed to be zero-to-peak calculations so that they are compared to only half of the stress value extracted from the fatigue curve. Likewise, when creating the Cumulative Usage report, the number of allowable cycles is based upon twice the calculated stress.

For other dynamic applications (response spectrum and time history), the stress type can be identified as fatigue by selecting the stress type from the drop list for the Load Case or Static/Dynamic Combination, and by entering the number of expected cycles in the provided field.

Note that as with the harmonic analyses, the calculated stresses are assumed to be zero-to-peak calculations so that they are compared to only half of the stress value extracted from the fatigue curve. Likewise, when creating the Cumulative Usage report, the number of allowable cycles is based upon twice the calculated stress.