z direction(out of plane)properties for composites
z direction(out of plane)properties for composites
(OP)
For an ansys analysis i need to know z direction(out of plane)material properties of on filament wound carbon/epoxy composite.but in handbooks i saw only the properties in x,y&xy directions.how can i have these properties.any help would be appreciated.
Cheers
alleak





RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites
It is necessary at least to enter Ez & Strenght in Z direction and it is sufficient to enter other modulus and strenghts relating to z direction.
Cheers
alleak
RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites
MODULUS: E1,E2,G12
STRENGHT: Xt,Xc,Yt,Yc,S
POISON RATIO:NU12
but there are more properties required by ansys,if i leave other blank ansys shows an error,until i use a value for modulus E3,and strenghts Zt,Zc,now ansys will solve the problem.I think this is because The Tsai-Wu failure criteria used in ansys are 3-D versions of the failure criterion.plus these there are other properties which leaving them blank does not make an error in ansys but this may influnce on the results.these properties are:
G23,G13,NU23,NU13,Zt,Zc,Syz,Sxz
Cheers
alleak
RE: z direction(out of plane)properties for composites
- what specific material are you using (fiber, resin, vendor)?
- what values are you entering for the in-plane properties? I know what the variables are; what is needed is the actual values.
RE: z direction(out of plane)properties for composites
your questions:
1-carbon fibers are TC-42 from TAIRYFIL co.
2-epoxy resin is LY5052,and hardener is HY5052,these are from CIBA co.
3-Wf(fiber weight ratio)is 0.625 so Vf(fiber volume ratio)is 0.5
4-values entered first are:
modulus:
Ex=1.103e11 pa
Ey=1.52e10 pa
Gxy=4.9e9 pa
poison ratio:
PRxy=0.25
strenght:
XTenstrs=1.918e9 pa
XComstrs=-1.569e9 pa
YTenstrs=2.74e8 pa
YComstrs=-1.245e9 pa
XYShstrs=6.895e7
by these values ansys shows an error
so i entered :
Ez=Ey
ZTenstrs=YTenstrs
ZComstrs=YComstrs
and i got a result but other values which may affect the final results are left blank:(G23,G13,NU23,NU13,Zt,Zc,Syz,Sxz )
Cheers
alleak
RE: z direction(out of plane)properties for composites
YT and YC appear to be way too high for a carbon/epoxy tape. I would use something like:
YT = 8 ksi (5.52E7 pa)
YC = -40 ksi (-2.76E8 pa)
for the thru-thickness properties:
EZ = 1.3 msi (8.97E9 pa)
(note your value for EY of 2.2 msi seems too high for an epoxy material at room temperature)
G13 = G12 = 4.9E9 pa
G23 = 0.67*G12 = 3.28E9 pa
NU13 = NU12 = 0.25
NU23 = [EZ/2/G23]-1 = 0.365 (assumes material is isotropic in the 2-3 plane)
ZT = YT = 8 ksi (5.52E9 pa)
ZC = YC = -40 ksi (-2.76E8 pa)
SXZ = SYZ = 5 ksi (3.45E7 pa)
Hope this helps.
RE: z direction(out of plane)properties for composites
Hyer M.W.,"Stress Analysis of Fiber Reinforced Composite Materials"McGrawHill 2001
perhaps these are for another kind of carbon/epoxy.
but i want to know how did you guess Ez and other formula,where are they from.are they from a reference or they are from your own experiments.
Cheers
alleak
RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites
Why don't you get your materials tested? You can get the material results in all directions you need. Some materials testing labs (like www.axelproducts.com) can help you out with that quite easily!
Ron
RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites
RE: z direction(out of plane)properties for composites