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Glossary
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Defining Fatigue SN Curves

SN curves are defined in the fatigue study, after you define a fatigue event. You can define SN curves:
  • In the Material dialog, on the Fatigue SN Curves tab, or
  • Right-clicking the top document icon and selecting Define Function Curves.

Creating a New SN Curve

To create a new SN curve:

  1. In a Fatigue study, add a fatigue event.
  2. In the Material dialog, on the Fatigue SN Curves tab, in the Source box do the following:
    1. For Interpolate, set the scheme for interpolating alternating stresses against the number of cycles of S-N curve.
    2. Select Define and select a curve from the ten curves that appear in the menu.
  3. In the Table data box, do the following:
    1. In the Stress ratio (R) box, enter the stress ratio associated with the curve.

      R = Smin/Smax

      where:

      Smin is the minimum stress in the stress cycle and Smax is the maximum stress.

      and,

      Smean=(Smax + Smin)/2

      where:

      Smean is the mean stress in the stress cycle.

    2. Set the unit of stress.
    3. Populate the curve data by entering Alternating Stress values versus number of Cycles, or click File to import a Curve Data Points File (*.dat).

      To add a new row, double-click in cell under the Points column.

      The format of the Curve Data Points File (*.dat) should have two columns: Number of Cycles (first column) and Alternating Stress (second column).

    4. Click View to graph the data or Save to save the curve to a library.

      Preview box shows the curve as it is defined.

    5. To delete a row, highlight it and click the Delete key or right-click it and select Delete.
    6. Type a source of reference for the SN curve data in Source.

    The format of the Curve Data Points File (*.dat) should have two columns: Number of Cycles (first column) and Alternating Stress (second column).

  4. Click Apply.

Defining an SN Curve for a Material

Some materials in the material library have SN curves defined. These material are identified by a (SN) attached to the end of their names in the list box. Materials with stress-strain curves are identified by (SS), and materials with both SN curves and stress-strain curves are identified by (SS,SN).

To define an SN curve for a material:

  1. In the Material dialog, on the Fatigue SN Curves tab, in the Source box do the following:
    1. Set the scheme for interpolating alternating stresses against the number of cycles of SN curve for Interpolate.
    2. Select Derive from material Elastic Modulus and select Based on ASME Austentic Steel curves or Based on ASME Carbon Steel curves.
  2. Click Apply.


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