Model validation

[cirokos]

Hi,

What boundary conditions and loads ( how to apply the load) do I have to apply in order to validate my model and calculate the in-plane elastic properties?
The model is composed of a unit cell, meshed with Shell elements, with uniform thickness.

I want to compare them with the theoretical ones from Gibson and Ashby.

Thanks a lot!

 

[rb1957]

?

one way of validating your model, after you've done all the QC checks, is to model a solution that you've done a hand calc for.

it sounds like you've done a hand calc ... "Gibson and Ashby". So, what boundary conditions did this use ?

are you going to reply to our questions (on your other thread) ?

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[cirokos]

Yes, I have done some calculations by hand but I am not sure how to load the unit cell in order to get the in-plane properties.

The ones I applied are to restrain the bottom nodes in x,y,z displacement(UX,UY,UZ) then loaded the cell with a displacement on the top nodes in the direction I want to calc the modulus.

Do you have any experience with fea?

 

[rb1957]

I have a tonne of experience with FEA, but little that would help here.


"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[cirokos]

Have any suggestions on how to approach the problem in general?

 

[rb1957]

I haven't seen the failure so I can't comment intelligently.

My own 2c ... figure out a better way to solve the problem, rather than sharpening the biggest pencil around (ie FEA). I'm sure something unusual is happening locally to the failure (rather than analyzing a honeycomb cell).

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.