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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Soft metamaterials offer tunable properties through structural design.
  • Understanding instability phenomena is crucial for predicting material behavior under load.

Purpose of the Study:

  • To investigate instability-induced pattern transformations in architectured multi-phase soft metamaterials under biaxial compression.
  • To analyze the impact of these transformations on elastic wave propagation.

Main Methods:

  • Theoretical derivation of critical strain and pattern transition criteria.
  • Analysis of micro- and macro-instabilities under equi-biaxial loading.
  • Elastic wave propagation analysis for different pattern types.

Main Results:

  • Equi-biaxial compression induces two distinct instability patterns (Type I: wall wrinkling; Type II: periodicity switching).
  • Pattern transformation significantly alters elastic wave propagation, affecting band gaps.
  • A theoretical criterion for pattern transition was established based on architecture and material properties.

Conclusions:

  • The study reveals distinct mechanical behaviors and rich properties of multi-phase soft metamaterials.
  • These findings pave the way for designing novel smart materials with deformation-controlled switchable functionalities.