Composite Design Basics
Quasi-isotropic lay-ups
A quasi-isotropic laminate uses equally represented directions—commonly 0°, +45°, −45° and 90°—to obtain approximately equal in-plane extensional stiffness in every direction.
In simple terms
A quasi-isotropic laminate uses equally represented directions—commonly 0°, +45°, −45° and 90°—to obtain approximately equal in-plane extensional stiffness in every direction.
Best for
Watch out for
Typical applications
General aircraft skins, plates, covers, vehicle structures and test coupons with multidirectional in-plane loads.
Related tools
Use the calculators to turn these concepts into preliminary engineering estimates.