Is

Altair Forum User

Would some one help me please. I want to do non linear static analysis on a plastic component. The plastic is ABS and We don't have the stress strain curve of this material the only info we have are shown in the below table. Is there any way to define this plastic material with out having the curve?

<?xml version="1.0" encoding="UTF-8"?>

 

Here is problem description

The following shows the part. The boss breaks due to applying 1nM torque in the center of the boss in real case

This is the result (in this case, It is assumed that material is in elastic domain). The result of analysis shows the maximum stress of 133 Mpa and the yield stress based on the material data in the above table shows is 49 Mpa

Can I from this model that, the part has failed since the maximum stress is more than the yield stress and confirm what is happening in reality (breakage of the boss)??

<?xml version="1.0" encoding="UTF-8"?>

 

 

Altair Forum User

In another trial I checked MATS1 and I did turned the TID off (because I don't have the stress -strain data) and set type to plastic

but I got this error message

*** ERROR # 941 ***
 NON-CONVERGENT NONLINEAR ITERATIONS FOR SUBCASE 1

 Suggestions:
 * This problem has elasto-plastic materials and the maximum plastic strain 1.56e+006
   is beyond the limit of small deformation theory. This may be the cause of
   non-convergence. Using fully integrated plastic elements may improve convergence,
   although possibly create overly stiff results.
 

Would you please send me drop box link. I appreciate if you can check my model.

gopal_rathore

Hi,

Is the location of breakage coming near the max. stress location ?

Altair Forum User

Hi,

Please share the model to my dropbox.

Altair Forum User

I just shared the file with you.

Altair Forum User

Hi Gopal

 

Yes It is close to where breakage happens.

Altair Forum User

Hi Bita,

Can you try with fully integrated elements and try running the analysis. In PSOLID property, change the ISOP to full (full integration) and try.
Also please re-check the material curve defined.
 

 

Rahul Rajan_21763

Did you try PARAM EXPERTNL.See attached screenshot.

<?xml version="1.0" encoding="UTF-8"?>