Abaqus/CAE User's Manual 12.8.5 Defining field variables at a material point （在一个材料点定义场变量） 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. （在ABAQUS 里面，你能够用子程序USDFLD 来求解变量。USDFLD 允许你将一个材料点上的场变量定义为时间函数，能够使用到的材料点在用户使用手册4.2.1节中“abaqus 输出变量的标识码”中被提及到。材料的特性被定义作为场变量的函数，因此依赖于求解方法。） （在每个被定义材料性能的点USDFLD 能够被调用） To include a reference to user subroutine USDFLD in a material definition: 1. From the menu bar in the Edit Material dialog box, select GeneralUser 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). Abaqus/CAE User's Manual （子程序USDFLD 在材料中的定义过程可参考下面： 1. 在编辑材料的对话框中，选择General- User Defined Field 2. 点击OK 关闭编辑材料的对话框，或者在编辑对话框中选择另外的一个材料特性。） ============================================...
