Metal forming

14 Mar 25

In implicit analysis of springback process, there are both linear and non-linear methods. Can you advise which one is better?

Linear method is faster, but it gives unstable predictions. It is used only for trial stage when only approximation result…

14 Mar 25

In implicit forming analysis, I found that the friction force was not properly applied, what could have been the problem?

You have to turn on the consistency flag (the third parameter in the card of *CONTROL_PARALLEL). The default value of…

14 Mar 25

In LS-DYNA, there are different material models and I’ve found it difficult to choose the proper material model. Would you please give me some suggestions in selecting the proper material model?

It depends on the specific requirement. There are two popular material models, i.e. *MAT_3_PARAMETER_BARLAT (MAT 36), and *MAT_TRANSVERSELY_ANISOTROPIC_ELASTIC_PLASTIC (MAT 37)…

14 Mar 25

In my analysis of the sheet metal forming process, I frequently found that the calculation could not continue and it terminated unexpectedly. Is there a way to avoid this?

In the forming analysis, there are several possibilities that will result in the failure of the calculation, they are: a)…

14 Mar 25

In my simulation, some of the corner nodes can be put in the wrong place. Can you advise what the problem is?

In the sharp corner regions, such as narrow bead, when there is penetration of the node into the rigid body,…

14 Mar 25

In springback analysis I don’t have enough memory or the analysis takes too much time. What can I do ?

In springback analysis I’ve found I have two problems: 1) When I use the implicit method I don’t have enough…

14 Mar 25

In springback analysis, I found that my constraint hasn’t been taken into account during the simulation, what was the problem?

If you put the constraint in the adapted slave node, then this is a possibility that the constraint might not…

14 Mar 25

In springback analysis, I just changed the constrained nodes a little bit away from the original node. The convergence then became very different and the predicted result seems not to be reasonable. What can be the problem?

Usually, when change the constrained node properly, the springback prediction should be unaffected, or the effect should be very small….

14 Mar 25

In springback analysis, we had no problem when gravity effect is not considered. However, after gravity effect is included in the input deck, there were some strange error messages. What might be the cause?

Double-check the density of the material model. Some people prefer to use the unit system as (gm,mm,ms), while others prefer…

14 Mar 25

I think spring back prediction by using implicit is not realistic. What is your opinion regarding the convergence issue?

Implicit spring back analysis is better if converged solution can be obtained. However, over the past two years, I have…

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Metal forming