JOHNSON HOLMQUIST MODEL PROBLEM 1

[Oluwakay]

Good morning Guys.
Please I need help!
I am trying to run a simulation of a steel projectile impacted on alumina plate. I used J-C model for the projectile and Johnson Holmquist model for the ceramic. Below is the feedback I got and the simulation was aborted:
THESE CHARACTERS DO NOT CONVERT TO FLOATING POINT VALUE
INVALID FLOAT VALUE
*USER MATERIAL,TYPE=MECHANICAL CAN ONLY BE GIVEN ONCE FOR A MATERIAL
Analysis Input File Processor aborted due to errors.


I have attached the INP file to this post.
I would appreciate every help I can get.
Thank you so very much!

 

[FEA way]

Is this keyword necessary ?

*User Material, constants=1
32.,

 

[Oluwakay]

I do not really know. It is my first time of trying out this model. Do you suggest I erase it?

 

[FEA way]

Yes, try without it. Compare your input file with the one provided in the "High-velocity impact of a ceramic target" example problem.

 

[Oluwakay]

I tried to erase it and the part of "*USER MATERIAL,TYPE=MECHANICAL CAN ONLY BE GIVEN ONCE FOR A MATERIAL" has been addressed. Now I am left with "THESE CHARACTERS DO NOT CONVERT TO FLOATING POINT VALUE
INVALID FLOAT VALUE"

 

[FEA way]

There's a small typo in the material properties - replace D2 = 0,7 with D2 = 0.7. Dot must be used as a decimal separator everywhere in Abaqus.

 

[Oluwakay]

WOW WOW WOW!
You are really a great help. It has worked.
However, I got this feedback "The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively" It just a trial version. I guess I need to sketch them to scale because the ceramic material seems to be too thin for the huge projectile. Do you also think that might be the case?

 

[FEA way]

Make sure that element deletion is enabled and proper damage variables are requested. The aforementioned example problem might be helpful also in this regard.

 

[Oluwakay]

Thank you for your feedback. How do I enable element deletion please?

 

[Oluwakay]

Seen! I think I cannot enable element deletion in this case since I already enabled "convert to particles" for the ceramic plate. The elements automatically delete with the above command. However, I could enable it for the impactor. I will run it again and see what changes.
Thank you!