I'm trying to determine which expanded foil (aluminum or copper) to use for lightning protection of the fuselage and wing of a business jet. I already followed SAE recommendations to establish the lightning zones and read through the lightning environment SAE document, which confused me even...
Does anyone know how to detect or display which elements are missing an orientation in Nastran 9. I use Femap as the modeler and before Femap calls Nastran I get an error that says: "18 laminate elements were written with default orientation. Usualy laminates require a specific orientation". My...
