Comments

• John M Thanks for the tip. I'll give it a shot when I get back to my pc

  in Moselling of arrow vibration Comment by barrti June 2021
• Here is one paper that discusses the complexities https://www.ocf.berkeley.edu/~archery/wp-content/uploads/docs/knsu.pdf It is discussing an olympic recurve bow which has the same issues I discussed with the traditional bow.

  in Moselling of arrow vibration Comment by barrti June 2021
• Victor,thanks for your input. I found a few papers on this phenomenon and it seems that when the arrow is released using 3 fingers on the bowstring, this imparts a lateral displacement to the arrow at the string. Also, this phenomenon is most pr…

  in Moselling of arrow vibration Comment by barrti June 2021
• Victor, Prop-Design and Sergio Thanks for your suggestions. I will check them out.

  in Deflection of bar using 3 different methods: - laminations, solid, merged nodes/shell offset Comment by barrti April 2020
• Thanks Victor for your suggestion RE STL option. Also thanks for the suggestion/warning on the tri6. Problem solved:) Much appreciated

  in Can one save nodes and line elements from Mecway as dxf file? Comment by barrti April 2020
• Thanks to Hengre and Victor. I appreciate the quick response. Its another reason I like Mecway! I didn't use this feature much until recently and normally wouldn't have noticed so soon. Anyway, hope you can update that one soon as it is a great …

  in v13 New Node question - trouble adding new nodes Comment by barrti April 2020
• Oops, it behaves as expected now that I've added a constraint at the ID! With E=200 GPa and 1MPa external pressure, get 1.13mm deflection along x which is now symmetrical about x as expected. Oh, done on V13Beta 2 BTW

  in Help with a 2-D mesh Comment by barrti March 2020
• Here's my play around. I imported the dxf, automeshed 2D, revolved 360 degrees around x-axis, cut out central section (for fun), pressurised to 1MPa on outside Can't figure out why the deformation is not symmetrical around x?

  in Help with a 2-D mesh Comment by barrti March 2020
• Wow thank you both. I am not home at the moment. I will investigate this when I am. Cheers

  in Crankshaft torsional vibration Comment by barrti February 2020
• Victor will;it ever be possible to trigger forces or pressures based on position as well as time?

  in Crankshaft torsional vibration Comment by barrti February 2020
• Hi Victor Thanks for you reply. I'll try your second suggestion first. If I use a simple spring that the piston can contact as it approaches TDC then this will simulate a piston compressing and expanding. This is a good fix for that part of the…

  in Crankshaft torsional vibration Comment by barrti February 2020
• Thanks Victor. That was the problem. Thanks Disla as well. I appreciate both of your help and advice. I got to learn a little more tonight. Cheers

  in V11 Meshing failed exit 1 Comment by barrti February 2019
• Hi Disla thanks for your comments. The file that worked had tet10 3d elements and I used v11 with that too. The file that does not work (v11) has 2d elements (tet3 or quad4). I'm confused because I cant see any bad geometry and additionally, I us…

  in V11 Meshing failed exit 1 Comment by barrti February 2019
• Great job - I couldn't think of anything technical to say but it looks like one of spongebobs friends at a disco wibbly-wobbly.

  in Jello animation Comment by barrti November 2018
• Disla and Victor Are 10 node tets going to help? Here is a good discussion by VMH on this forum Aug 2015. https://mecway.com/forum/discussion/comment/431/#Comment_431 I remember being impressed with the 10 node tet thinking that for some thin str…

  in Storage tanks. Comment by barrti November 2018
• Disla Thanks for your help. Brainstorming is great when it works isn't it!

  in Creating force actuator Comment by barrti November 2018
• This a great method Disla - thank you. You have reminded me that yet another way is to click "show element surface" and then add a pressure to the end of the element.

  in Creating force actuator Comment by barrti November 2018
• Works well but I had problems with the shell element rotating on the beam element. I think this is because there is no drilling degree of freedom in this case. I put extra beam elements in to stop rotation Thanks Disla for the tip

  in Creating force actuator Comment by barrti November 2018
• Thats clever. Thanks Disla. I will experiment later.

  in Creating force actuator Comment by barrti November 2018
• Victor and Disla Thank you.

  in Creating force actuator Comment by barrti November 2018
• Hi Victor No, i didn't get to it. Is it as easy as going to Tools/Labs/and clicking CCX Reduced Integration on Linear Elements?

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Victor, Thanks for that. FEA is an art often it seems! Cheers

  in Applying Moments to line 3 beam using ccx and nonlinear 3d dynamic Comment by barrti October 2017
• Sergio Thankyou for your advice too. Greatly appreciate your efforts. Cheers

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Simon Thanks for all of your work and advice. That has helped a lot. Yes, I am convinced you are correct - it is hard. I did a little with several big name codes a few years back. Can't say I was impressed then. I was trying to model impact fo…

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Thanks Victor That is very wierd? Do u think that this is a ccx bug/peculiarity? Maybe the arm you added gives the moment something to push on:) Some searching of the Calculix ccx info on beam elements: http://web.mit.edu/calculix_v2.7/CalculiX…

  in Applying Moments to line 3 beam using ccx and nonlinear 3d dynamic Comment by barrti October 2017
• Sergio I finally finished a run with a refined 8 node version of the test strip. I have attached the liml and inp files as requested below as well as a few images. This version use fairly realistic material - Bilinear withe 250MPa yield and Tange…

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Sergio I meant that I ran your model down and up to completion to 29.9mm deflection (T=1.0 sec) on my machine using v7.0. When I first ran your model on v7.0 , it stopped at T=0.33 sec. When I unticked automatic time steps, it ran to completion (T…

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Sergio I ran your exact file in v7.0 with automatic steps unticked and it ran to completion which it would not do before. Before with automatick ticked, V7.0 would stop at T=0.33sec. I stopped its motion at 29.9 sec to avaoid explosion. Barrti

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Sergio Thanks so much for all of the work you have put into this. I'm not finished yet but I followed your suggestions and got an improvement when I used 8 node elements and also simplified the restraint. I got greater movement and the strip was a…

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
• Victor, Thanks for this. I am trying to get about 10mm movement of the big block -i.e 90 degrees bend. I followed your instructions and eventually got about 5mm by increasing the Contact stiffness to about 100xE. I still cant get the 90 degree b…

  in Sheet Metal Bending Simulation- Non Linear CCX , Steel Strip using Contacts Comment by barrti October 2017
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