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 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.
<generation> Definition of a generation.
The <generation> tag defines a new generation. It takes the following child elements.
<start_time> “birth”-time for this generation [t]
<solid> 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