Rod Lakes
Elasticity: Poisson
honeycomb

honeycomb 2



Normal foam



Re-entrant foam
R. S. Lakes, Foam structures with a negative Poisson's ratio, Science, 235 1038-1040 (1987).


Atomic scale



foam detail



neg cover



Poisson vs. strain



micro-cell Poisson



micro-cell structure



Chiral honeycomb structure



Chiral honeycomb properties



Chiral honeycomb movement