You can save linear material properties (whether they are temperature-dependent or constant) to a file
or restore them from a text file. (See Using Material Library Files (p. 15) for a discussion of material library
files.) You also can use CDWRITE,MAT to write both linear and nonlinear material properties to a file.
If using the CDWRITE command in any related product (ANSYS Emag, ANSYS Professional, etc.), edit
the Jobname.CDB file that CDWRITE creates to remove commands which are not available in the
derived product. You must do this before reading the Jobname.CDB file.
1.1.4.2. Nonlinear Material Properties
Nonlinear material properties are usually tabular data, such as plasticity data (stress-strain curves for
different hardening laws), magnetic field data (B-H curves), creep data, swelling data, hyperelastic ma-
terial data, etc. The first step in defining a nonlinear material property is to activate a data table using
the TB command (see Material Model Interface (p. 8) for the GUI equivalent). For example,TB,BH,2
activates the B-H table for material reference number 2.
To enter the tabular data, use the TBPT command. For example, the following commands define a B-
H curve:
TBPT,DEFI,150,.21
TBPT,DEFI,300,.55
TBPT,DEFI,460,.80
TBPT,DEFI,640,.95
TBPT,DEFI,720,1.0
TBPT,DEFI,890,1.1
TBPT,DEFI,1020,1.15
TBPT,DEFI,1280,1.25
TBPT,DEFI,1900,1.4You can verify the data table through displays and listings using the TBPLOT or TBLIST commands.
Figure 1.2: Sample TBPLOT Display (p. 7) shows a sample TBPLOT (of the B-H curve defined above):
Figure 1.2: Sample TBPLOT Display
1.1.4.3. Anisotropic Elastic Material Properties
Some element types accept anisotropic elastic material properties, which are usually input in the form
of a matrix. ( These properties are different from anisotropic plasticity, which requires different stress-
strain curves in different directions.) Among the element types that allow elastic anisotropy are PLANE13
(the 2-D coupled-field solid),SOLID5 and SOLID98 (the 3-D coupled-field solids).
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