assembly
assembly
(OP)
in ne nastran how do i model different parts and then assemble them. like in abaqus u create different parts and then in assembly module u create an instance and assemble the model. is there a way i can follow this method in nastran?





RE: assembly
For instance, if I bring in an FE model from another software package, it will have groups that FEMAP understand and it will characterize those groups as "properties" and "materials". Look up "Create Group" in the FEMAP documentation and it will tell you how to group the different properties for visualization, but this does not alter the (virtual) physical characteristics. You may also select individual elements or entire groups and update their properties and/or materials.
Hope this gets you headed in the right direction.
Garland E. Borowski, PE
RE: assembly
RE: assembly
If you have a reasonable complex project, with more than thirty parts, you may want to develop some modeling guidelines. Things to consider are 1) nodes from different parts lining up, 2) the consistent resolution of details (curves, holes, thickness changes, etc), and 3) the fastening of the different parts. Also, detailed models of multiple, assembled parts don’t make much practical sense due to the large volume of output and the run times required. You may want to divide the assembly into sub assemblies based on loaded area. Or, develop a total assembly model using a reasonably coarse grid with the ability to transfer internal loads from the coarse model to detailed models of the parts.
Also, if you have a lot of parts to assemble, you may want to generate the part finite element models programmatically, in case you have to change some of your guidelines. Pick an area of your assembly with five to ten parts in multiple planes, connected with different types of fasteners, in order to evaluate/develop the modeling guidelines.
RE: assembly
RE: assembly
In summary, to tie the nodes, use rigid elements if you just want to transfer load, or use bolt / solid elements if you are concerned about the failure of the fastner.
RE: assembly
RE: assembly
RE: assembly