Los Alamos National Laboratory
Lab Home  |  Phone
 
 
LANL Home >> EES Home >> EES-17

Research Highlights

CONTACTS

Nonlinear, Nonequilibrium Elasticity in Diverse Materials


Summary

Dynamic nonlinear elastic behavior, nonequilibrium dynamics, first observed as a curiosity in earth materials has now been observed in a great variety of solids. The primary manifestations of the behavior are characteristic wave distortion, and slow dynamics, a recovery process to equilibrium that takes place linearly with the logarithm of time, over hours to days after a wave disturbance. The link between the diverse materials that exhibit nonequilibrium dynamics appears to be the presence of soft regions, thought to be primarily 'damage' at many scales, ranging from order 10-9 m to 10-1 m at least. The regions of soft matter may be distributed as in a rock sample, or isolated, as in a sample with a single crack. The precise physical origin of the behavior is clear in some cases such as granular media where the source of the nonequilibrium dynamics, grain-to-grain interaction, is well understood. In other materials, it appears that the origin must be due fundamentally to shear sliding, related to crack and possibly dislocation dynamics, as well as less clear origins. Because the physical origins of the behavior are related to damage, damage diagnostics in solids, Nonlinear NonDestructive Evaluation, follows naturally. Nonequilibrium dynamics also plays a significant role in other areas such as earthquake strong ground motion and potentially to earthquake dynamics.

For more information, please contact Paul Johnson.


 

Book Published - Nonlinear Mesoscopic Elasticity


Authors Robert A. Guyer and Paul A. Johnson have published Nonlinear Mescopic Elasticity. This book is available from both Amazon and the publisher, Wiley VCH.

Sample Chapter

  • Print ISBN: 9783527407033
  • Online ISBN: 9783527628261
  • DOI: 10.1002/9783527628261
  • Copyright © 2009 Wiley-VCH Verlag GmbH & Co. KGaA

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA

Inside | © Copyright 2010-11 Los Alamos National Security, LLC All rights reserved | Disclaimer/Privacy | Web Contact