Metal forming Archives - Page 9 of 10 - LSDYNA

Metal forming

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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14 Mar 25

When we do springback analysis, we have two choices to do it, i.e. using implicit and explicit method (dynamic relaxation). What is the advantage of using the implicit method in springback analysis?

Springback process is purely a static process, and if dynamic relaxation is used, the CPU cost will be prohibitive long…

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14 Mar 25

Why does the restart of the springback analysis not work?

I attempted to restart the springback analysis from the d3dump01. The springback analysis was not performed even though the “message”…

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14 Mar 25

Why dynamic relaxation doesn’t seem to work at times?

For the analysis of static loading process, such as gravity loading, dynamic relaxation method is commonly used with the keyword…

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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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