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18.104.22.168 The in-situ stretch update rule
The idea behind this update rule is to enforce the fiber stretch induced by the initial prestrain gradient. As with the in-situ stretch generator option, this rule has an isochoric version and an uniaxial version for the update rule.
where , is the fiber stretch induced by the distortion.
|isochoric||Choose the isochoric update rule or not||1(=true)|
<constraint type="in-situ stretch"> <tolerance>0.01</tolerance> <isochoric>1</isochoric> </constraint>