Metal forming

14 Mar 25

When I trimmed the mesh after forming, I only used one trim curve (in IGES format), but LSDYNA found 10 trimming curves. Accordingly, the result was not acceptable. What was the problem?

It is found that when there are multiple semicolons (;), then the IGES file contains multiple trimming curves. Even though…

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14 Mar 25

When I use constrain method (SOFT=4 in the FORMING_ONE_WAY_xx card), the calculation terminates immediately, what is the problem?

Constrain method cannot be used with the rigid body which is applied by load.

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14 Mar 25

When I use FEA, I don’t know how big the mesh size should be. Would you please tell me what is the proper mesh size?

For the blank, there should be at least four to six elements to cover a 90-degree radii region. A coarse…

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14 Mar 25

When I use mesh adaptivity in my stamping simulation I don’t know how to define the proper adaptive frequency. Would you please give me some suggestions?

It depends on the specific case. If the initial mesh is too coarse, it is necessary to have a very…

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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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