Corrugated Skin

A surface that has a waveform for stronger strength,
Corrugated skins  provide  a good solution to morphing airfoils  due  to their highly anisotropic behavior. If the low  stiffness corrugation  plane  is  aligned in  the chordwise direction the airfoil  shape  change is possible. In contrast to the traditional smooth skin of an airfoil, a corrugated skin influences both the local and global aerodynamics of a airfoil.