Metal forming

14 Mar 25

When I use the implicit method to do springback analysis I cannot obtain a converged solution no matter what I’ve done. Do I have some other choices to obtain a converged solution for springback prediction?

Yes, you still have one more choice to get a converged solution. In LSDYNA3D, if you cannot get a converged…

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14 Mar 25

When I used coarsening, I found that there is an error message:’ Something is wrong, sub: nextele’. What is the problem, and how can I avoid it?

When the normal of the initial blank mesh is not uniform, this problem might happen. It is easy to avoid…

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14 Mar 25

When I used implicit method to do springback analysis, the iteration information was not output or displayed in the screen. I think this iteration information is important for me to monitor the convergence status. How can I display this information?

In the card of *CONTROL_IMPLICIT_NONLINEAR, there is a parameter NLPRT (the fourth parameter in the second line of this card),…

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14 Mar 25

When I used switch method in my calculation, I used explicit method and then I changed to implicit method. In the later implicit calculation process, it was seen that the contact didn’t work properly. What was the problem, and how can I avoid this?

In implicit analysis, the constraint approach for FORMING contact is not implemented (this contact is activated when SOFT=4, the first…

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14 Mar 25

When I used the seamless method to do both forming and springback analysis, a converged solution wasn’t obtained. I don’t want to repeat the forming analysis. Is there a way I can repeat the springback analysis from the previous output files?

There are two ways to repeat the springback analysis: a) Generate a ‘dynain’ file from the d3dump01, which was generated…

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14 Mar 25

When the constraint contact is used, the calculation crashes during the forming analysis. What needs to be done to prevent this?

There is a limitation in the constraint method. It is not permitted to have constrained contact on both sides of…

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