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The material type for Simo's c.d.f.  is “CDF Simo”. The following material parameters must be defined:
|<a>||Parameter (same units as ,||[ ]|
|<b>||Parameter (||[ ]|
For this material the c.d.f. is given by Note that represents the maximum allowable damage. Therefore, regulates the maximum allowable damage, whereas controls the rate at which increases with increasing .
<damage type="CDF Simo"> <a>0.1</a> <b>0</b> <Dmax>1</Dmax> </damage>