FEA on assembly yes/no
FEA on assembly yes/no
(OP)
If you are dooing FEA on assembly can you please point some major reasons why not to do it separately on parts instead
when doing assembly, i found that lnumber of parts should be limited to two (e.g. press fit and other contact stress on 2 surfaces)
In all of other case i try to stay away from assembly, the more parts the more errors.
Assembly contains numerous non-natural constraints that multiply error downstream.
On one part, using free-body diagram, i can always adjust and make-up for any expected irregularity, through load or constraints or material metalurgy non-consistancy.
Just one example is a problem with martensite structure only on the surface, which cannot be modeled on FEA, so it has to be compensated manually.
what are your oppinions?
when doing assembly, i found that lnumber of parts should be limited to two (e.g. press fit and other contact stress on 2 surfaces)
In all of other case i try to stay away from assembly, the more parts the more errors.
Assembly contains numerous non-natural constraints that multiply error downstream.
On one part, using free-body diagram, i can always adjust and make-up for any expected irregularity, through load or constraints or material metalurgy non-consistancy.
Just one example is a problem with martensite structure only on the surface, which cannot be modeled on FEA, so it has to be compensated manually.
what are your oppinions?





RE: FEA on assembly yes/no
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: FEA on assembly yes/no
But you probably think about that there are so complex assemblies that really need whole things. I have no experience with such thinks as a whole car frame from sheet metal interacting with something else. That should be really tough.
I would rather like to explore something, say, like heavy industry machinery.
RE: FEA on assembly yes/no
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: FEA on assembly yes/no
there are a few techniques for do spot welds with a single element per spot to gather forces, moments etc but assessment needs to be based on criteria developed for such an approach. many are inhouse and propriety for companies.
ive assemblies of hundreds of parts welded or bolted together and ive done breakaway analysis or sub models. there is no single answer to all this