Max Degradation Value ?

[yassou]

Hi every body.

Maximum degradation and choice of element removal


You have control over how Abaqus treats elements with severe damage. You can specify an upper bound,D_MAX , to the overall damage variable, D; and you can choose whether to delete an element once maximum degradation is reached. The latter choice also affects which stiffness components are damaged.

Specifying the value of maximum degradation
The default setting of D_MAX depends on whether elements are to be deleted upon reaching maximum degradation (discussed next). For the default case of element deletion and in all cases for cohesive elements,D_MAX=1.0 ; otherwise,D_MAX=0.99 . The output variable SDEG contains the value of D. No further damage is accumulated at an integration point once D reaches D_MAX(except, of course, any remaining stiffness is lost upon element deletion).

Now my main question is this:
How should we specify the Maximum Degradation Value ? And know this value is correct ?
As Far As i search in web different values (0.5 and Default and ...) set to it.
Or This a Trial,Error procedure ?
Because i have simulation of damage with element deletion, i run it (without Error and Warning) with default Maximum degradation, some elements get deleted but some stick to the part and distorted slowly (without warning and error).
But if Max Degradation Value set to 0.5 that elements will be remove from analysis. But how much this value affect on simulation is a question ?
Image 1 (Max Degradation=0.98):

Image 2 (Max Degradation=0.5):

With Best Regards.
yassou.

 

[Mustaine3]

When you know what this parameter means and does, then you can answer the question yourself. So check the Users Manual again. There it is explained quite well.