The main step is to decide how you are going to model and what kind of answer you need. Of course you have to know merits and drawbacks of each element. Example: a table or chair is optimaly to model with combination of shell and beam elements - enough to answer about its deformation, but if you need predominantly 3D stress especially at the connection between plates and beam then you are modeling with solid elements at least at this part of the connection
Combination of the low order FE like shells and beams etc. are always computationally faster than direct modelling with solid element. Characteristical example - export geometry from CAD and direct meshing with solid elements leads to a very computationally costly model and even not very precise from the stress point of view
Identify your model whether volumeteric or surface model.
In case of surfaces ,better to read in shell elements.
In case of volumeteric read about beam elements !
The main step is to decide how you are going to model and what kind of answer you need. Of course you have to know merits and drawbacks of each element. Example: a table or chair is optimaly to model with combination of shell and beam elements - enough to answer about its deformation, but if you need predominantly 3D stress especially at the connection between plates and beam then you are modeling with solid elements at least at this part of the connection
Combination of the low order FE like shells and beams etc. are always computationally faster than direct modelling with solid element. Characteristical example - export geometry from CAD and direct meshing with solid elements leads to a very computationally costly model and even not very precise from the stress point of view
See also this answer here:
https://www.researchgate.net/post/When_should_we_choose_Linear_or_Quadrilateral_elements_for_meshing
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