From 3D CAD model to shell model for FEM structural analysis

[thegasperus]

Dear fellow engineers!

I have a question about creating correct model for FEM structural analysis of thin plate that has one dimension significantly smaller than other two. Approx. dimensions of plate (X)800 x (Y)600 x (Z)(+-30) mm and thickness is 0.8 mm. Plate has cuts/holes on it on multiple positions and bend edges in Z directions. For now I only have 3D CAD model of that plate. However I want to prepare a FEM structural simulation (in ABAQUS or similar) which would require a usage of shell elements for analysis to be physically correct. For static structural simulation with 3D I would use at least 5 finite elements per thickness. The static structural simulation would be created with load in the Z direction.

Therefore I am wondering if there is a way to prepare this kind of FEM model? To create a shell model from 3D CAD model or is there any other suggestions to this problem?

I could simplify the model by leaving out details in +-Z direction, but they are very important for the result of the simulation. Also I don't know if a use of submodel could help here since the thickness is really small compared to the other dimensions?

I hope I explained the problem good enough for you to understand. I am happy to give additional information, but I cannot send the real 3D model. I can create (in general) a similar part and put a picture of it on here for better understanding of the geometry and loads.

Thank you upfront.

Best regards.

TheGasperus

 

[FEA way]

It would be good if you could share a picture of similar model. Generally speaking, many FEA programs (including Abaqus) provide an option to create shell model from solid (either by making it hollow and leaving only boundary faces or by creating surface in the middle of the solid). It’s highly automatized but in case of more complex geometry you may have to do it manually.

 

[thegasperus]

@FEA way

it looks like something like this back panel of washing machine on this link:

https://www.google.com/url?sa=i&sou...PxerlAhWkMewKHb6HCXcQjRx6BAgBEAQ&url=https://

http://www.repairclinic.com/PartDet...aw2S0L6M5tFrdeJaHRMW-j0m&ust=1573849815487527

Best regards

TheGasperus

 

[FEA way]

Those sitffening beads indeed are important for the correct evaluation of the plate’s response. I would leave bigger holes/cuts too. But the smallest holes as well as some other little features can be ignored for the sake of good accurate mesh. Defeaturing is standard procedure in FEA model preparation.