Hosford-Coulomb damage

The Hosford-Coulomb damage initiation criterion is a special case of the ductile criterion in which the equivalent plastic strain at the onset of damage is a function of the stress triaxiality, material parameters, and strain rate.

The Hosford-Coulomb criterion can be used in conjunction with the Mises, Johnson-Cook, Hill, and Drucker-Prager plasticity models. It can also be specified together with any other initiation criteria; each initiation criterion is treated independently.

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Damage Initiation for Ductile Metals
  1. From the menu bar in the Edit Material dialog box, select Mechanical Damage for Ductile Metals Hosford-Coulomb Damage .

    (For information on displaying the Edit Material dialog box, see Creating or editing a material.)

  2. Enter the material parameter, Accumulation power, equal to the value of the power coefficient, N.
  3. To define material damage data that depend on temperature, toggle on Use temperature-dependent data.

    A column labeled Temp appears in the Data table.

  4. To define behavior data that depend on field variables, click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables.

    Field variable columns appear in the Data table.

  5. Enter the damage parameters in the Data table:

    a

    Material parameter a.

    b

    Material parameter b.

    c

    Material parameter c.

    n

    Material parameter n.

    d

    Material parameter d.

    ε ˙ 0

    Reference strain rate.

    Temp

    Temperature, θ .

    Field n

    Predefined field variables.

    You might have to expand the dialog box to see all the columns in the Data table. For detailed information on how to enter data, see Entering tabular data.

  6. Select Suboptions Damage Evolution to define the material degradation that takes place once damage begins.

    For more information, see Damage evolution.

  7. Click OK to exit the material editor.