Second order element in composite modeling

Hey Guys!

I've just wondering, it is useful to apply second order element for composite in Hypermesh using Optistruct as a solver? I think the composite theories use pretty much linear approximation between layers that's why I'm asking this 'silly' question.

Thanks for answers in advance!

Have a nice day,

Imre

ps.: if you have any good tutorial, books etc. for composite modeling I would be grateful if you can share with me!