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4.15.2.1 prestrain gradient
The prestrain gradient generator defines the full prestrain gradient matrix either for the entire material or for each element separately. It has one parameter, namely the prestrain gradient for the entire material.
| parameter | description |
| F0 | 3x3 initial prestrain gradient matrix |
Example:
<material id="1" type="prestrain elastic">
<elastic type="neo-Hookean">
<E>1.0</E>
<v>0.3</v>
</elastic>
<prestrain type="prestrain gradient">
<F0>1,0,0,0,1,0,0,0,1</F0>
</prestrain>
</material>