Nonlinear Material Data Form

Access the Nonlinear Material Data form as follows:

Click the Define menu > Materials command to access the Define Materials form. The Define Materials form also can be accessed by clicking the + (plus) symbol that may appear next to a drop-down list of available materials, such as the Material drop-down list on the Shell Section Data form, or the {Frame Section Type} Data forms.
Check the Show Advanced Properties check box.
Click the Add New Material button to access the Material Property Options form.
Click the Modify/Show Material Properties button to access the Material Property Data form.
Click the Nonlinear Material Data button.

Use the Nonlinear Material Data form to specify the nonlinear material property data to be used if property nonlinearity is considered during analysis.

Material Name display box. The name of the material property to which the nonlinear property data applies appears in this display box.
Material Type display box. The material type to which the nonlinear property data applies appears in this display box.
Property Temperature display box. If the material property has been defined as temperature dependent, this area is added to the form and the display box shows the temperature at which the specified parameters apply.
Hysteresis Type drop-down list. Select the hysteresis type for the curve.
Drucker-Prager Parameters and the Friction Angle and Dilatational Angle edit boxes. When available, use the defaults or type values in degrees in the edit boxes.
Stress-Strain Curve Definition Options. Choose to define the stress-strain curve parametrically or by specifying values directly.

Parametric option and drop-down list and Convert to User Defined button.

Parametric Strain Data area. Use the suggested default values or enter revised values in the edit boxes in this area to specify the Strain at the Unconfined Compressive Strength and the Ultimate Unconfined Strain Capacity.
Show Stress-Strain Plot button. Click this button to display the Material Stress-Strain Curve Plot form.

User Defined option. When this option is selected, specify the number of points to be used to define the plot in the Number of Points in Stress-Strain Curve edit box. The number specified in this edit box determines the number of rows of data required in the spreadsheet in the User Stress-Strain Curve Data area. Use the default or enter revised values in the cells in the Strain and Stress columns

Order Rows button. After entering data in this spreadsheet, click this button to reorder the rows in ascending order, which is necessary for the data to plot correctly.
Show Plot button. Click this button to display the Material Stress-Strain Curve Plot form.

After the nonlinear data has been specified as part of the material property definition, the definition can be assigned to a selected area(s), frame(s), cable(s), tendon(s) or solid(s).

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