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Drilling in Composite with Hashin Damage

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Peterle123

Peterle123

Aerospace
Oct 26, 2020
14
Hello,

Im modelling a Drilling operation in Abaqus for a composite Material. I used the following Materialparameters to define the composite:
I used Hashin Criteria for Damage modelling. But when i try to simulate it, there is no damage and an error occurs and the modell looks like this:
How can i make the Model work, so that the Elements get deleted? Do I need more parameters? I tried to use Element Deltion oin, but it doesnt work either.

Thanks for your help.
 
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You have to add the STATUS variable to field output requests and then, after the simulation, make sure that it’s selected in Result —> Field Output —> Status Variable.
 
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It seems that the damage criterion wasn't fulfilled. You can plot special variables such as DAMAGEFT to see this. Check the documentation chapter "Damage evolution and element removal for fiber-reinforced composites" for more details.
 
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You should check the output variables representing other criteria as well. You may have to adjust the material properties to achieve the desired goal.
 
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I checked the output variable for the hashin damage and it looks like this:
The other Hashin criteria modes look the same.
It is weird because the red parts should fail and thus should be removed from the modell. Or am I wrong? I cant change the material properties because these are given.
 
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Maybe I did something wrong with the units. I use mm for lenght, kg for mass and MPa. What unit do I have to use for the Fracture Energies? I used kj/m^2. Is this wrong? If yes what would be the correct unit?
 
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Indeed, units in Abaqus can be quite confusing and cause some problems. With mm used for dimensions you should define mass in tonnes. Fracture energy would be in mJ/mm^2.
 
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Are you sure that deletion is enabled in Element Type window ? Which type of elements do you use for the deformable part ?
 
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Now I got this Error message:

"Excessive incremental rotation of the elements in element set ErrElemExcessIncrementalRotation-Step1.

There is only one element with excessive rotations"

I also get this in message files:
"The ratio of deformation speed in element CFK_45-2.1050 vs. the
wave speed of the element, 553.613E-03 exceeds 0.3.


The maximum ratio of deformation speed to wave speed is 0.55361 in element
1050 of instance CFK_45-2 at increment 757595.
"

ow can I fix this?
 
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I looked at the STATUS plot and I saw that it is still 1 for every Element, even if the MAtrix Damage is 1. How can I change the STATUS of the Element to 0 so it fails?
 
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