Metal forming

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…

14 Mar 25

I tried to use LSPOST to compare the strain state with FLD. When I selected the element and clicked the plot button, nothing was plotted. What was the problem?

You need to output the strain and strain components during the forming simulation. You can output strain data by setting…

14 Mar 25

If a converged solution from springback prediction cannot be obtained after trying many different combinations of parameters, what else can I do?

Use dynamic relaxation method. Usually this is not necessary. For most of the application jobs, converged solutions can be obtained…

14 Mar 25

If I didn’t find wrinkling and strain localization in from my simulation, can I say that my design is good?

For most of the problem, the answer is yes. When we form a part by using die and punch, to…

14 Mar 25

If I use very coarse mesh for the pre-deformation (such as pre-bending, gravity loading etc), and then refine the mesh in the later forming analysis. Will it result in obvious numerical error for the final results?

With coarse mesh, it is very efficient to obtain results for the pre-deformation. However, if the mesh is too coarse,…

14 Mar 25

If localized necking occurs what can I do to get rid of it?

Localized necking is the result of too much stretching. There are two possible ways to avoid localized necking, i.e. 1)…

14 Mar 25

If wrinkling occurs, what can I do to get rid of it?

Since wrinkling result from compressive stress, it is possible to decrease wrinkling by increasing stretching. Two commonly practices are: increase…

14 Mar 25

I’ve found that when I use several CPUs with the SMP code that only one CPU is working and the other CPUs are idle. What is the problem and how can it be corrected?

In the forming analysis, sometimes when the mesh is distorted, the slave node is pushed too far away from its…

14 Mar 25

I generated a dynain file after forming analysis. Additionally, I used DYNAFORM to trim the mesh, and did springback prediction. However, I found that the predicted springback is too small to be true. What is the problem?

This is a difficult question, there are many factors affecting springback prediction. However, it is said that there is a…

14 Mar 25

I had no problem in running a forming job, however, when I used adaptive method, the contact does work properly even from the beginning without adaptivity. What is the problem?

If the forming contact is used, the automatic reorientation of contact interface segments during initialization is selected automatically. However, the…

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Metal forming