3D Woven Composite Convert G31 to G13 1

[rstupplebeen]

I have composite material properties for a 3D woven composite. We have all 3 E's, all 6 nu's they only have 3 G's specifically G12, G23 and G31. Abaqus requires G13 not G31. Is there a closed form solution to convert for this different convention?

Thank you for your help.
Rob

Rob Stupplebeen
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[ESPcomposites]

G13 = G31

You may be thinking of how the elastic modulii are related to the Poisson's ratio. See attached (orthotropic material in 3D) to ensure those relationships are correct. No such coupling exists for the shear modulii.

http://files.engineering.com/getfil...732c-4cf7-8e58-d5869c870bc3&file=equation.jpg

Brian
www.espcomposites.com

 

[rstupplebeen]

Brian,

Thank you very much! I remembered that nu is dependent on the order and couldn't remember if G was as well. All I remembered was that nu was trickier. My friend's over at Abaqus pointed me to the same table in help files which may be useful to this group.

In the Abaqus Analysis User's Guide: Section 22.2.1 Linear Elastic Behavior: Defining orthotropic elasticity by specifying engineering constants.

Thank you again!

Rob

Rob Stupplebeen
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