Converted document
$\newcommand{\lyxlock}{}$
Section 4.7: Multigeneration Solids Up Section 4.7: Multigeneration Solids Section 4.8: Biphasic Materials

### 4.7.1 General Specification of Multigeneration Solids

The material type for a multigeneration solid is “multigeneration” [J]  [J]  As of FEBio version 2.0, the format for definining multi-generation materials has changed. The previous format where the generations are defined in the Globals section is no longer supported.. This material describes a mixture of elastic solids, each created in a specific generation. It is a container for any combination of the elastic materials described.
 Definition of a generation.
The <generation> tag defines a new generation. It takes the following child elements.
 “birth”-time for this generation [t] Specification of the constitutive model for this generation
The solid element defins the solid matrix constitutive relation and associated material properties.
Example:
<material id="1" name="Growing Solid" type="multigeneration">
<generation id="1">
<start_time>0.0</start_time>
<solid type="Holmes-Mow">
<density>1</density>
<E>1</E>
<v>0</v>
<beta>0.1</beta>
</solid>
</generation>
<generation id="2">
<start_time>1.0</start_time>
<solid type="Holmes-Mow">
<density>1</density>
<E>1</E>
<v>0</v>
<beta>0.1</beta>
</solid>
</generation>
</material>

The corresponding value of for each of the generations is provided in the <Globals> section.
Example:
<Globals>
<Generations>
<gen id="1">0.0</gen>
<gen id="2">1.0</gen>
</Generations>
</Globals>


Section 4.7: Multigeneration Solids Up Section 4.7: Multigeneration Solids Section 4.8: Biphasic Materials