problem in modeling an FRP composite 1

[frztrb]

To model an FRP composite with fibers in one direction , in material properties and section definition , if the data are as bellow , how should I define this material ?

Material parameters
Characteristic stiffness values and transverse contraction

Elasticity modulus GPa E0° 17/23/28*
Elasticity modulus GPa E90° 8,5
Shear modulus MPa G 3,00
Poisson’s ratio - V0°,90° 0,23
Poisson’s ratio - V90°,V0° 0,09

also I am not sure that how many layers are there in this composite , due to the difference btw the E1 and E2.


using Engineering Constants requires E in 3 directions and also v , but the data are as mentioned

 

[isyhadh]

you need to find other values of E1,E2, G1, G2, v11,v12,v23 from literature

otherwise set your section as solid, and material type elastic isotropic rather than engineering constant

 

[compositesFEAguru]

The following blog posts address how to use what data you have available to create a full composite material definition:

http://info.firehole.com/blog/bid/184546/Composite-Material-Properties-Part-1-Required-UD-Properties

http://info.firehole.com/blog/bid/1...erties-Part-2-Determine-Unknown-Lamina-Values

I would define the material using Engineering Constants (all the values can be determined or estimated using the information in the above blog posts and your data). If you don't know the number of layers, do you at least know the percentages of various orientations (ex. 50/40/10 meaning 50% 0s, 40% 45s and 10% 90s)?

Regards

Firehole Composites

http://www.firehole.com

 

[frztrb]

That's a very good help , The composite is just one layer , and unidirectional polyester resin with glass fiber material , the problem is v12 and v21 are not equal here and engineering constants can not take both of them and assume them symmetric! I think maybe it doesn't make so much difference .

 

[compositesFEAguru]

v12 and v21 should not be the same as they represent the Poisson effect in two different directions, transverse to the fiber direction and parallel to the fiber direction. Use v12 when defining your material using Engineering Constants.

Firehole Composites

http://www.firehole.com