Metal forming

14 Mar 25

When I run forming simulation, I had such message as “Error: slaves nodes may cross the surface, please check your model, job continues.” I’ve checked my input deck and didn’t find any obvious mistake for the mesh. How can I fix this problem?

This problem results from bad mesh of the rigid tools. If one of the parts is not connected, LS-DYNA will…

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14 Mar 25

Will the mesh coarsening affect the accuracy of springback prediction?

A properly coarsened mesh will not affect the springback prediction. It has been found that when we specify the proper…

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14 Mar 25

When I tried to trim the mesh after forming, the generated ‘dynain’ file contains the mesh without trimming, what is the problem and how can I fix it?

In LS-DYNA, there are only two occasions that you can trim the mesh, i.e. before and after forming analysis. If…

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14 Mar 25

When I trim the blank using IGES file, there is a message such as “Entity type xxx form 0 not supported # lines = x”. What does it mean?

It means that one of the entities in the IGES file is not supported by LSDYNA. If you encounter this…

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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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