Search
Close this search box.
Notifications
Clear all

strange error/message: panic54: ode3_iter=500

1 Posts
1 Users
0 Reactions
260 Views
Posts: 5
Topic starter
(@valeryanpilov)
Active Member
Joined: 2 years ago

Good afternoon,

I'm trying to model the cyclic compression of a hyperelastic foam, given a non-linear viscosity.

*** From the experimental data, it can also be assumed that the material has the Mullins effect.

I'm trying some combinations of TNV ,Micromechanical Foam Model and Parallel Network Model models

the beginning of the solution is very safe, but then suddenly this message appears:

SPRINGBACK: artificial stabilization is now 5.487 percent removed
Iteration: 1 *|du|/|u| = 2.2886202E-03 *Ei/E0 = 9.9999530E-01
Iteration: 2 *|du|/|u| = 2.3446773E-03 *Ei/E0 = 2.6076704E-05
Iteration: 3 *|du|/|u| = 1.5140868E-03 *Ei/E0 = 7.0546274E-06
Iteration: 4 *|du|/|u| = 1.8750130E-03 *Ei/E0 = 5.9217354E-06
Iteration: 5 *|du|/|u| = 7.5868495E-04 *Ei/E0 = 3.2110337E-06
Equilibrium established after 5 iterations 05/14/23 06:29:33

BEGIN implicit dynamics step 558 t= 5.4969E+01 05/14/23 06:29:46

SPRINGBACK: artificial stabilization is now 5.497 percent removed
Iteration: 1 *|du|/|u| = 2.0209830E-03 *Ei/E0 = 9.9998732E-01
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500
ode step: panic= 54
panic 54: jbloop=501
panic54: ode3_iter=500

------------------------------------

 

the duration of such messages is very long... from 10,000 to 60,000 lines, after which the solution continued...

-----------------------------------------------------

ode step: panic= 54
panic 54: jbloop= 501
panic 54: ode3_iter= 500
ode step: panic= 54
Iteration: 2 *|du|/|u| = 3.0485406E-02 *Ei/E0 = 4.0227709E-03
panic 54: jbloop= 501
panic 54: ode3_iter= 500
ode step: panic= 54

Iteration: 3 *|du|/|u| = 2.1502948E-03 *Ei/E0 = 2.1260036E-05
Iteration: 4 *|du|/|u| = 1.4214971E-03 *Ei/E0 = 5.8464379E-06
Iteration: 5 *|du|/|u| = 1.6393704E-03 *Ei/E0 = 1.6233349E-05
Iteration: 6 *|du|/|u| = 1.6093846E-03 *Ei/E0 = 9.2325898E-06
Iteration: 7 *|du|/|u| = 4.1000254E-03 *Ei/E0 = 3.0288250E-05
Iteration: 8 *|du|/|u| = 6.7627042E-04 *Ei/E0 = 5.0217483E-06
Equilibrium established after 8 iterations 05/14/23 17:45:44

I would appreciate any help.

I have changed the Jacobian and ODE solver global variables - but it didn't help me.

Share: