Fatigue Curves - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Displays the Material Fatigue Data dialog box, where you specify cycle and stress values.

Stress - Typical units (depending on your unit system):

  • lb/in2

  • KPa

  • N/mm²

Use material fatigue curve data to evaluate fatigue load cases and cumulative use scenarios. The software considers fatigue curves to be specified using a logarithmic interpolation.

IGE/TD/12 provides the opportunity to type up to five fatigue curves, representing fatigue classes D, E, F, G, and W. Fatigue evaluations are explicitly specified by IGE/TD/12. CAESAR II offers them as extensions to other codes.

Cycles / Stress

Defines cycles and stresses in pairs. You must type the values in ascending order by cycles. Type stress values as the allowable stress range rather than allowable stress amplitude. You can type up to eight cycle-stress pairs.

Read from File

Displays the Open dialog box where you can select a .fat file containing cycle and stress data. The software provides some .fat files.

  • Cycle and stress values carry forward (in cycle/stress pairs) to succeeding elements until you manually change a value. When you change a cycle or stress value, the software retains the values of the cycle/stress pair even if the values later change in a preceding element.

  • The software always replaces a blank field with 0.

  • Static fatigue cases are evaluated against the full range of the fatigue curve, while dynamic fatigue cases are assumed to represent amplitudes, and are therefore evaluated against half of the range of the fatigue curve.