Abaqus USDFLD使用教程

1. From the menu bar in the Edit Material dialog box, select General → Depvar.

(For information on displaying the Edit Material dialog box, see ―Creating or editing a material,‖ Section 12.7.1.)

2. Click the arrows to the right of the Number of solution-dependent state variables field to specify how many solution dependent state variables you want to allocate space for at each applicable integration point or contact slave node.

3. If applicable, enter the state variable number controlling the element deletion flag in the field labeled Variable number controlling element deletion (Abaqus/Explicit only). For more information, see ―Deleting elements from an Abaqus/Explicit mesh using state variables‖ in ―User-defined mechanical material behavior,‖ Section 25.7.1 of the Abaqus Analysis User's Manual.

4. Click OK to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see ―Browsing and modifying material behaviors,‖ Section 12.7.2, for more information).

CAE手册 12.8.5 Defining field variables at a material point

In Abaqus/Standard you can introduce dependence on solution variables with user subroutine USDFLD. This subroutine allows you to define field variables at a material point as functions of time, of any of the available material point quantities listed in ―Abaqus/Standard output variable identifiers,‖ Section 4.2.1 of the Abaqus Analysis User's Manual, and of material directions. Material properties defined as functions of these field variables may, thus, be dependent on the solution.

User subroutine USDFLD is called at each point for which the material definition includes a reference to the user subroutine.

To include a reference to user subroutine USDFLD in a material definition:

1. From the menu bar in the Edit Material dialog box, select General→User Defined Field.

(For information on displaying the Edit Material dialog box, see ―Creating or editing a material,‖ Section 12.7.1.)

2. Click OK to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see ―Browsing and modifying material behaviors,‖ Section 12.7.2, for more information).