Has anyone ever simulate a Sparse Double Dense or honeycomb structure? seems that Solidworks underestimate these part's stiffness for my case 300 or 500 percent smaller than actual deformation. the calculation was realatively quick, but I guess Solidworks took some shortcut instead of using a lot of memory. Is there anyway to improve the accuracy? I used the smallest mesh size already.
If you use only solid elenments , you can use h-adaptive or p-adaptive methods
I prefer using the H-Adaptive, When you go into the dialogue to "Create Mesh", you can click the drop down under Mesh Settings and type in a value. The trick here is to make sure you have at least 2 mesh elements across the thickness of your solid, to ensure that your part can create a strain through the thickness. Hope this helps!!
thank you! unfortunately my memory ran out.is there any way to say its a shell element just like abaqus?
Definitely!! just RMB on the Solid and select "Define Shell by Selected Faces", then follow the dialogue box, if you have issues there is a little "?" in the top right of every dialogue box that will take you to Help.
Approach 1:
Use midplane extraction to create surfaces bodies of the lattice structure, then use shell elements.
Downfall- many local bonded connections needed with increased error at the bonding sites between shell and solid elements. And a fair amount of investment in modeling time.
Approach 2:
Create a representative model of a portion of the lattice structure, mesh it as solids, and perform displacement-only analysis. Be sure ot ploace a minimum of two high-qiuality saolid elements across the thickness/web direction. Use these results to determine an equivalent stiffness and then apply that as a custom material to dummy lattice bodies in your original model. (can be solid "panels" even if they are thin so long as out-of-plane stresses are not too great)
Approach 3:
Simplify the lattice to exclude fillets or chamfers and use a very fine solid element mesh.
Downfall- increased computational effort, especially if one is only looking for displacements.
