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Drucker-Prager Help

Drucker-Prager Help

Drucker-Prager Help

(OP)
Hello,

I am trying to run a powder compaction analysis using Standard and I keep getting the following warnings and error.  Can anyone help me out with this or give me a good place to look.


 ***WARNING: THE STRAIN INCREMENT IS SO LARGE THAT THE PROGRAM WILL NOT ATTEMPT
             THE PLASTICITY CALCULATION AT 35 POINTS

 ***WARNING: THE PLASTICITY/CREEP/CONNECTOR FRICTION ALGORITHM DID NOT CONVERGE
             AT 6 POINTS
 

 ***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE
          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.

 ***WARNING: CONVERGENCE JUDGED UNLIKELY.  INCREMENT WILL BE ATTEMPTED AGAIN
             WITH A TIME INCREMENT OF 1.95313E-02


  INCREMENT     1 STARTS. ATTEMPT NUMBER  5, TIME INCREMENT  1.953E-02

 ***WARNING: THE PLASTICITY/CREEP/CONNECTOR FRICTION ALGORITHM DID NOT CONVERGE
             AT 1 POINTS
 

 ***NOTE: MATERIAL CALCULATIONS FAILED TO CONVERGE OR WERE NOT ATTEMPTED AT ONE
          OR MORE POINTS. CONVERGENCE IS JUDGED UNLIKELY.

 ***WARNING: CONVERGENCE JUDGED UNLIKELY.  INCREMENT WILL BE ATTEMPTED AGAIN
             WITH A TIME INCREMENT OF 4.88281E-03
 

 ***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT






Thanks,

Chris

RE: Drucker-Prager Help

Some advice:
-set the NLGEOM on
a.-set the maximum time increment to a small value (say 0.1)
b.-set the initial time increment to a very small value (say 0.01)
c.-set the minimum time increment to a very very small value (say 10^ -10)
-verify to have the loadings applied in a "ramp" manner

If it still does not converge try to reduce the values from a. b. c.
Also you can try to remesh your model.

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