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4.6.2.5 Step
The material type for a step c.d.f. is “CDF step”. The following material parameters must be defined:
<mu> | Parameter (same units as | [ ] |
<Dmax> | Maximum allowable damage (optional, default is 1) | [ ] |
For this material the c.d.f. is given by where is the Heaviside unit step function. The step c.d.f. may be used to model fracture.

Example:
<damage type="CDF step"> <mu>1.0</mu> <Dmax>1</Dmax> </damage>