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Subsection 3.14.3: The Prestrain Update Rules Up Subsection 3.14.3: The Prestrain Update Rules Subsubsection 3.14.3.2: prestrain update rule

#### 3.14.3.1 Using Update rules

In order to apply an update rule, a constraint definition must be added to the Constraints section of the input file. The type attribute is used to specify which update rule to use.
<Constraints>
<constraint type="[name of update rule]">
<!-- parameters go here -->
</constraint>
</Constraints>

The following table lists the available update rules.
 type description prestrain Eliminate distortion due to incompatibility in-situ stretch Enforce the given in-situ fiber stretches
Below, the supported update rules are presented in more detail. All of them share parameters for controlling the convergence of the update algorithm and these shared parameters are listed in the following table.
 parameter description initial value update update flag (1) 1 tolerance convergence tolerance 0.0 min_iters minimum number of iterations 0 max_iters maximum number of iterations -1 (i.e. ignored)