Piezoelectric nanobeams having circular, rectangular and hexagonal cross-sections are synthesized and used in various Nano structures; however, piezoelectric nanobeams with hexagonal cross-sections have not been studied in detail. In particular, the physical mechanisms of the surface effect and the role of surface stress, surface elasticity and surface piezoelectricity have not been discussed t...

We present results of a hybrid experimental, theoretical, and simulation-based investigation the postbuckling behavior thin elastic rods axially impacted by projectile. find new mechanism: mode coarsening. Much akin to inverse energy cascade phenomena in other nonlinear dynamic systems, is transferred during coarsening from higher lower wave numbers---unless rod breaks, abruptly dissipating cou...