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?
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.
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)
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.