Modified items All recently modified items, latest first. Is the order relevant in which I do triming and coarsening of the mesh? When I do springback analysis after trimming, I need to coarsen the mesh to decrease the memory requirement and increase the computation speed. We can trim the mesh first and then do coarsen the mesh; we also can coarsen the mesh first, and trim the mesh later. Is there any difference between the above two methods? Is it possible to do forming simulation by using both implicit and explicit method in the same run? Is it possible to coarsen a uniformly refined mesh, as well as an adaptively generated mesh? Is it possible to allow separation/gap between elements within one part? In springback analysis, we had no problem when gravity effect is not considered. However, after gravity effect is included in the input deck, there were some strange error messages. What might be the cause? In springback analysis, I just changed the constrained nodes a little bit away from the original node. The convergence then became very different and the predicted result seems not to be reasonable. What can be the problem? In springback analysis, I found that my constraint hasn’t been taken into account during the simulation, what was the problem? In springback analysis I don't have enough memory or the analysis takes too much time. What can I do ? In springback analysis I’ve found I have two problems: 1) When I use the implicit method I don’t have enough memory and can’t continue the calculation; and 2) At other times springback analysis takes too much time. Are there any methods available to solve these problem? In my simulation, some of the corner nodes can be put in the wrong place. Can you advise what the problem is? In my analysis of the sheet metal forming process, I frequently found that the calculation could not continue and it terminated unexpectedly. Is there a way to avoid this? In LS-DYNA, there are different material models and I’ve found it difficult to choose the proper material model. Would you please give me some suggestions in selecting the proper material model? In implicit forming analysis, I found that the friction force was not properly applied, what could have been the problem? In implicit analysis of springback process, there are both linear and non-linear methods. Can you advise which one is better? If wrinkling occurs, what can I do to get rid of it? If localized necking occurs what can I do to get rid of it? 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? If I didn’t find wrinkling and strain localization in from my simulation, can I say that my design is good? If a converged solution from springback prediction cannot be obtained after trying many different combinations of parameters, what else can I do? 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? 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 done over sixty forming simulations, and I only got two converged solutions for spring back simulation. So I think spring back prediction by using implicit is not realistic. What is your opinion regarding the convergence issue? Previous 20 items 1 ... 30 31 32 33 34 35 36 37 Next 20 items
