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Shrinaath

roll bending

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Springback results are sensitive to the magnitude of damping factor, especially when unphysically high damping is used.

 

Check the following papers for details:

https://www.sciencedirect.com/science/article/pii/S0924013604003577

https://www.sciencedirect.com/science/article/pii/S1000936113001751

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Hi @Ivan

 

i facing problem during running the job that my simulation remaining time is keep on increasing with error percentage. i attached the text file ERROR.txt for reference. does the model have any issue in the contact??

 

i have attached my model file please check

 

2D_SHELL_0000.rad

2D_SHELL_0001.rad

2D_SHELL_0002.rad

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Hi,

 

Looks like the contacts are causing the large negative energy error. But the root cause is the too high timestep imposed by AMS. First, run with DT/NODA mass scaling until you get reasonable negative energy (15%) and mass error (2%) throughout the simulation. Then set up the AMS run trying to hit the energy error % of DT/NODA run (as well as stress and displacements). Set the Iflag=2 and Nprint=1000 to output the number of iterations before the convergence of the conjugate gradient in the out file (less than 30 is good). There should be only a few cycles where INTER is controlling the timestep. 

 

It is recommended to use Iform=2 with contact friction.

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