Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Schematic representation of lamellar twist.
(b) Schematic view normal to fold plane of lamellar crystal showing repulsion (shaded areas) leading to surface stress f.
(c) Macroscopic model of surface stress. A similar stress pattern exists on the opposite side of the body.
