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problem in modeling an FRP composite

problem in modeling an FRP composite

problem in modeling an FRP composite

(OP)
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

RE: problem in modeling an FRP composite

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

RE: problem in modeling an FRP composite

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...

http://info.firehole.com/blog/bid/190436/Composite...

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
www.firehole.com

RE: problem in modeling an FRP composite

(OP)
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 .

RE: problem in modeling an FRP composite

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
www.firehole.com

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