Foreshadowing elastic instabilities by negative group velocity in soft composites

Viacheslav Slesarenko, Pavel I. Galich, Jian Li, Nicholas X. Fang, Stephan Rudykh

Research output: Contribution to journalArticlepeer-review


We reveal the existence of a state in soft composites, characterized by the omni-directional negative group velocity in the vicinity of elastic instability. We show that the appearance of the negative group velocity in layered and fibrous composites foreshadows microscopic loss of the stability. In contrast with classical instability-induced pattern transformations, the transition between states with positive and negative group velocities is not accompanied by geometrical rearrangements and can be triggered by very fine variation of the compressive deformation in stable composites. Finally, we analyze the effect of the geometrical characteristics and elastic moduli of the constituents on the strain range for induced state with negative group velocities.

Original languageEnglish
Article number031901
JournalApplied Physics Letters
Issue number3
StatePublished - 16 Jul 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Foreshadowing elastic instabilities by negative group velocity in soft composites'. Together they form a unique fingerprint.

Cite this