# Mesh error problem **URL:** \ **Category:** General Questions\ **Created:** [May 1, 2022, 10:56am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181 "2022-05-01T10:56:24Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 1, 2022, 10:56am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/1 "2022-05-01T10:56:24Z")
I made U-Type shape aluminium material stamping nonlinear analysis. Before finish analysis, mesh has error like below figure. ![Error](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/8d16b615fc02a75fa2d44d04cf2a7dd5dcae53e9.jpeg) I don’t know how to solve it. If possible ,could you give me advise ? -----Material Setting---------- Density 2.7E-09 Young modulus 69000MPa Poisson’s ratio 0.33 Yield sterss Plastic strain 183 0 2450 0.2 —Surface behavior---- Type Linear K 30000 N/mm2 Co Deault — My code (Condition part only ) – > **[Pastebin.com - Locked Paste](https://pastebin.com/7HjYDNFV)** > > Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time. PW : JfaBSxW7uZ ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [May 1, 2022, 11:33am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/2 "2022-05-01T11:33:40Z")
Can you share the whole input file or .pmx file ? Even in private message if you don’t want to make it public. It will be hard (if not impossible) to help without it. ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 1, 2022, 1:11pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/3 "2022-05-01T13:11:36Z")
Thank you very much for your message. I found uploader site. If possible, could you download and check my pmx code ? > **[BestMeshTest\_FineSurface\_28PL\_0.2.pmx (BestMeshTest\_FineSurface\_28PL\_0.2.pmx)...](https://ux.getuploader.com/Yasuhiro_Suzuki/download/2)** > > YS より、BestMeshTest\_FineSurface\_28PL\_0.2.pmx (BestMeshTest\_FineSurface\_28PL\_0.2.pmx) をダウンロードします。 Download PW: prepomax I have not solved this mesh problem for many years by myself. ![Stamping](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/411aec5c8f23f593a52d9272860369f8d2c8f971.jpeg) ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 1, 2022, 1:23pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/4 "2022-05-01T13:23:47Z")
I would like to change parameter as follows – Surface behavior – K value 60,000 Min (from 30,0000 to 60,000 Min N/mm2 ) –Yield stress Plastic strain– 183 0 1,300 (from 2,450 to 1300 ) 0.2 ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [May 1, 2022, 3:18pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/5 "2022-05-01T15:18:33Z")
First of all, assign the rigid body constraints to the whole parts instead of just their surfaces to make tools entirely rigid. In the case of a die you will also have to change the region of a fixed BC to the reference point. Then try refining the mesh of the stripper plate. You may also have to refine this region of the blank: ![mesh](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/a4c8da93c003b43570e46a7b3c5eac2ba4daba76.jpeg) It seems that there are problems with mesh transition in this area. Also, have you tried solving this problem with the explicit dynamics step ? ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [May 1, 2022, 5:05pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/6 "2022-05-01T17:05:33Z")
Using a smoother shape of the material yield stress - plastic strain curve instead of a bi-linear curve might also help with the convergence. ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 2, 2022, 2:32pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/7 "2022-05-02T14:32:26Z")
FEAnalyst san, Matej san, Thank you very much for your kindly message!!! I tried analysis again. But i had mesh error again… If possible ,could you confirm uploaded file ? > **[File on MEGA](https://mega.nz/file/cv5DAAjR#EwchCS6URt5JuW6OYR7MU-HBfJ2CIjGaJIFVZ2IJkz4)** > **[File on MEGA](https://mega.nz/file/lvoWDCrA#JQdrt8_uMqbc9IAeRRzMBULiIFnNvrBTEsk77UYHZMo)** > Also, have you tried solving this problem with the explicit dynamics step ? I don’t know how to select “explicit dynamics step” on PrePoMax. If possible ,could you let me know how to select it ? Remark: I use Mega storage first time. If you cannot download my file, could you let me know it ? ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [May 2, 2022, 5:15pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/8 "2022-05-02T17:15:23Z")
I downloaded the files without any issues. I would recommend Google Drive or Dropbox for storage since the files don’t disappear there after some time (which is often a problem in case of forums) but this one is also fine. What I would still improve: - rigid body constraints should be applied to whole parts, as I’ve mentioned before (just switch the selection mode to Part) - refine also the mesh of the stripper plate - it’s very coarse now The explicit dynamics step is not implemented in PrePoMax yet but you can define it using keywords. Check the CalculiX user’s manual for the \*Dynamic keyword: [http://www.dhondt.de/ccx\_2.19.pdf](http://www.dhondt.de/ccx_2.19.pdf) ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 3, 2022, 12:26am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/9 "2022-05-03T00:26:11Z")
FEAnalyst san, Thank you very much for your reply!! Is “rigid body constraints should be applied to whole parts” attached photo setting stage ? If so , i cannot select part. ![rigid body constraints](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/dcd7561d5adca8cba886af0c0fd9ee4e2f102b0c.jpeg) ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [May 3, 2022, 10:41am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/10 "2022-05-03T10:41:10Z")
You have to switch to part selection here: ![rb](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/52b7064b69fbaa97120fcee23767a7f9f52c5312.jpeg) ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 3, 2022, 3:19pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/11 "2022-05-03T15:19:43Z")
body, table, td, th, h1, h2, h3 { font-family: Arial, sans-serif !important; } Dear FEAnalyst san, Thank you for your kindly reply! If possible, could you let me know which is best on “Set selection” ? Surfaces,edges and vertices Part Edge angle Surface angle ![Edit_Contact_Set_Selection](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/1560dd3a157c0a2daf93928a8796da5c735132e5.jpeg) ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [May 3, 2022, 5:36pm UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/12 "2022-05-03T17:36:56Z")
It depends on what you want to select. Usually, the first option is enough if your selection is based on geometry. ---
**Author:** ![PaoPao1970](https://avatars.discourse-cdn.com/v4/letter/p/d9b06d/32.png) [@PaoPao1970](https://prepomax.discourse.group/u/PaoPao1970)\ **Post date:** [May 4, 2022, 11:30am UTC](https://prepomax.discourse.group/t/mesh-error-problem/181/13 "2022-05-04T11:30:12Z")
Dear FEAnalyst san, Thank you for your message many times! I had mesh error again. Is “Static Analysis” difficulty with finishing analysis ? > **[22.23 MB file on MEGA](https://mega.nz/file/xu5UmCzT#t97RPaee1VaIA6YBc8fRY04LUSdoxG6TsSlHRlCNznw)** I tested Dynamic analysis as follows. But it was failure… \*Step, Nlgeom, Inc=10000 \*DYNAMIC,ALPHA=0,SOLVER=SPOOLES 1.E-2,1,1.E-30,1.E-4 > **[346.8 KB file on MEGA](https://mega.nz/file/JihikCBL#DFmy9c9eb0w4l_ZmLXJS-5O9HauIE25u0ZQXwPzcWGE)**