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orthotropic lamina properties

thread327-340944

orthotropic lamina properties

orthotropic lamina properties

(OP)
Dear

i have lamina with orthotropic properties how i can derive an expression for Gxy (equivalent shear stress) in terms of E1, E2,v12,G12, and theta ????

where: E1: is the elastic modulus at the fiber direction
E2: elastic modulus at transverse direction
v12: is the main possion ratio

please advise since i am working on research and i can't obtain the equivalent shear modulus ?

RE: orthotropic lamina properties

Mike - This calculation gets rather complex and probably can't be expressed too easily in a single equation. I would look into obtaining a composite laminate analysis software package.

Firehole Composites
www.firehole.com

RE: orthotropic lamina properties

(1/Gxy) = 4(m^2)(n^2)(1+v12)/E1 + 4(m^2)(n^2)(1+v21)/E2 + [(m^2 - n^2)^2]/G12
v12/E1 = v21/E2
m = cos(theta)
n = sin(theta)

From "Engineering Mechanics of Composite Materials", Daniel and Ishai, 2nd edition, p. 84.
The Jones book probably has it too.

Brian
www.espcomposites.com

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