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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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