Metal forming

What can I do if the mesh for the last state was not written to the d3plot after restarting from d3dumpxx?

I performed springback analysis using the seamless method, but no converged solution was obtained. Then I wrote a small input deck and restarted the calculation from d3dumpxx. From the message file, the converged solution was obtained, but when I tried to use Taurus to display it, the mesh for the last stage was not written to the d3plot file. Is there a way to avoid this?

What is FLD?

What is the commonly used contact type in stamping analysis?

In LSDYNA, there are many choices for contact. What is the commonly used contact type in stamping analysis?

What is the effect of R value (material anisotropic parameter) on FLD?

What is the effect of R-value on material formability?

What is the material formability?

What is the proper punch speed that could be used in stamping simulation?

What is the proper strategy to switch from implicit and explicit method or from explicit to implicit method?

What is the use of defining a box for drawbead?

What is the use of RIGID-BODY_STOPPER?

What kind of velocity pattern is better for metal forming analysis?

When I a used drawbead in the forming analysis, it was observed that some of the elements which moved over the bead line were distorted, and there is no obvious reason for this effect. What might be the problem?

When I attempt to do a springback analysis, I sometimes have difficulty in obtaining a converged solution. What options are available to improve convergence of springback?

When I did dynamic relaxation analysis in gravity loading process, it took a long time to get a converged solution. Is there a way to make this analysis faster?

When I did forming simulation, I found that a material failure was predicted earlier then expected, what might be the problem?

When I do springback analysis, the prediction is not satisfactory. I didn’t find any problem in the input deck. What should I check to improve the solution quality?

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?

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?

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?

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?

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

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?

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?

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?

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 I used implicit method to do springback analysis, the iteration information was not output or displayed in the screen. I think this iteration information is important for me to monitor the convergence status. How can I display this information?

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?

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?

When the constraint contact is used, the calculation crashes during the forming analysis. What needs to be done to prevent this?

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?