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Staedtlerp

Honeycomb modeling with shell elements

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Good morning all,

 

I'm modeling a composite laminate made of carbon fiber layers and honeycomb.

I'm modeling using the pshell elements and MAT8 card. The question is that I don't really know how to fill the material card entries.

I'm using Nomex honeycomb and the properties provided by the supplier are those depicted in the attached photo.

Using MAT8 I need 9 mechanical properties (E1, E2, NU12, G12, Xt, Yt, Xc, Yc, and S, excluding density) but I haven't got these properties and I don't know how to insert the properties provided by the supplier's datasheet.

 

Can anyone help me??

 

Thank you very much

 

 

honeycomb_1.JPG

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I generally model Nomex honeycomb in the same way, and would make this MAT8 card for that core:

 

MAT8           1     1.0     1.0     0.3      1.0   41.0    20.0  3.2-11
                                     1.0      1.0    1.0     1.0    0.35

EDIT: You can put the real strengths in if you like, but generally I just use 1MPa since I don't check the failure of the core within my FEM analysis. I use 1.0 for E11 and E22 since the honeycomb doesn't carry load in these directions - the skins do.

 

Rahul R likes this

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Hi @Staedtlerp

Is there a reason for modeling honeycomb with the shell?

 

The std practice is to model with solid elements. but if you have a very large honeycomb cell size, shells can be used effectively as long as you are not resin filled.  If your core is a significant thickness in the total composite, it would be more appropriate to use a solid representation anyway rather than assuming it is a "layer" in a composite PCOMP

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19 hours ago, MattM said:

It depends on the model and the part. For example we don't use solid elements in GFEMs of whole aircraft models in the aerospace industry.

Yes, because of their large size.

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