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The material type for a log-normal c.d.f. is “CDF log-normal”. The following material parameters must be defined:
|<mu>||Parameter (same units as ,||[ ]|
|<sigma>||Parameter (||[ ]|
|<Dmax>||Maximum allowable damage (optional, default is 1)||[ ]|
For this material the c.d.f. is given by Note that which shows that is the value of at which half of the bonds break. Here, regulates the rate at which damage increases with increasing , with smaller values of producing a more rapid increase.
<damage type="CDF log-normal"> <mu>1</mu> <sigma>0.5</sigma> <Dmax>1</Dmax> </damage>