SteveDoyle2
commented
8 months ago Also for cylindrical/spherical coordinate systems:
Open SteveDoyle2 opened 8 months ago
SteveDoyle2
commented
8 months ago Also for cylindrical/spherical coordinate systems:
The mcid option (integer) on the theta/mcid is not supported. The default is theta=0.0. Anyways, the MCID/material coordinate system is the preferred way to specify a coordinate system for an orthotropic (e.g., carbon fiber composite) material.
The math is below:
MICD (material coordinate system)
n = normal i = x-axis of material coordinate system jmat = cross(normal, i) # k x i jmat = jmat / norm(jmat) imat = cross(jmat, normal)
Theta (element coordinate system)
imat = xyz2 - xyz1 imat = imat / norm(imat) jmat = cross(normal, imat) # k x i jmat = jmat / norm(jmat)
The Mystran QRG has:
The MSC Nastran QRG has:
Also for completeness, almost nobody uses the tflag and differential thicknesses