Compound isotropic materials

A compound isotropic material is a single material that consists of multiple isotropic materials whose properties you define directly or that are calculated with available methods that you specify. When you create a compound isotropic material, you can add a fluid material, such as air, which you can use to define void regions within the compound material. Defining a compound material allows you to create 3D printed materials for additive manufacturing, and to create axisymmetric models where the cross section represents multiple materials to be modeled.

Note:

• The default void material is Air from the Default Library.

• You can control the default material and library location in the Customer Defaults dialog box.

The following tables provide information about the options you should use to define properties for compound isotropic materials. The options are available on the Compound page in the Compound Material dialog box.

Constituent Materials
Specifies several isotropic materials that compose the Compound Material along with their percentage of volume.You must choose an existing material or define a new material for each constituent material.
Percent Material	Specifies percentage of volume. The total of these percentages must be less or equal to 100%.Enter a constant value or click for other magnitude options. For information about other magnitude options, see DesignLogic list options menu.
Choose material	Lets you define a new material or select an existing material from the Material List.
Void Material
Specifies a fluid material that defines the void regions.The software calculates the percentage of the void material. It will be equal to 100% minus the total percentage of the constituent isotropic materials.
Void Material	Lists the default material that is set in the Customer Defaults dialog box.
Choose material	Defines a new material.
Property Calculation
Specifies how the software calculates the Mass Density (RHO) in the Properties group and the resultant properties from the constituent materials for the other isotropic material pages, such as Mechanical, Strength, and so on.
Density Method	Lists the method to calculate the Mass Density (RHO) in the Properties group for informational purposes only.
Method	Controls the method to calculate the resultant material property values for the other isotropic material pages.**Voigt (Volume Based)**This is also known as Upper Bound and is used in isostrain situations. The value is calculated from\sum \left( {ConstituentFraction * ConstituentValue} \right)**Reuss (Volume Fraction Based)This is also known as Lower Bound and is used in isostress situations. The value is calculated from\sum {\left( {ConstituentFraction/ConstituentValue} \right)^{ - 1}}Voigt-Reuss-Hill AverageThis averages the calculated Voigt and Reuss values.(Voigt + Reuss) \div 2User Specified (reset to defaults)**The software resets the property values to default values. This allows you to enter your own values, for example, from physical tests, that are not based on the above calculation methods.
Calculate Resultant Properties	Calculates the resultant properties using the specified Method.Note: For detailed information about how the resultant properties calculation affects values on other isotropic materials pages besides the Compound page, see Resultant properties below.When you do not click Calculate Resultant Properties , the software uses your own specified values.

Resultant properties

When you choose a method and click Calculate Resultant Properties, the software calculates a value for each material property, for example, Yield Strength, on each material page, for example, Strength, for the new compound material. To calculate these new values, the software compares each property value for each constituent material based on the percentage value and uses the following rules to determine the final value.

Example:

Constituent Materials	Percent Materials	Yield Strength [kPa]	Method	Final value [kPa]
Steel-Rolled	50	23500	Voight (Volume Based)	0.5 * 235000 + 0.25 * 226000 + 0.25 * 275000 = 242750
AISI_Steel_1005	25	22600
Titanium-Annealed	25	27500

Type of value	Handling
Boolean	When all values match, the software uses that value.
Coordinate system	When all values match, the software uses that value.
Text	This type includes multiple line inputs, file names, directory paths, and so on.When all values match, the software uses that value.
Enumerated lists	When all values match, the software uses that value.
Integer	When all values match, the software uses that value.
Scalar	The software combines the values using the specified Method.
Scalar array	When the same number of values exist, the software combines each value with the corresponding values in the other scalar array values using the specified Method.
Scalar tables	When the same number of rows and columns exist, the software combines each value with the corresponding values in the other scalar tables using the specified Method.
Matrix	When the same dimensions exist, the software combines each value with the corresponding values in the other matrices using the specified Method.
Scalar field	When all constant values exist, the software combines the values using the specified Method.When at least one table or formula exists, and the domains are consistent, the software constructs a table that combines the values using the superset of independent values from the original fields.
Complex	The software combines only the real or magnitude portion of the complex value. However, the software allows you to enter your own combined imaginary (or phase) complex value.
Complex field	Only, when the same field is used, the software combines only the real or magnitude portions of the field values. However, the software allows you to enter your own combined imaginary (or phase) complex values.Also, the software combines the scale factors using the specified Method.
General field	The software combines each dependent value into a new table using the superset of independent values.
Referenced material properties	Only, when the material is the same, the software combines referenced material properties.
Note: The software uses default values for all other conditions and types.You can also choose to specify different values than what the software calculates or clear values.When inconsistent units exist, the software returns the values in the default units.When one or more of the properties are not specified on a constituent material, the software does not combine the values and uses the default value.Field domains must be consistent to merge. Otherwise, the software returns default values.The software merges fields by finding common independent values and retrieving the dependent values from the fields.When multiple independent variables exist, the group of independent values must be consistent. For example, when the first independent variable has a value of 10.0 in common fields, the second independent variable values must be common as well.

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Compound isotropic materials, Simcenter 3D 2021.1 Series

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