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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Composite Materials

Background:

  • Auxetic materials possess unique deformation characteristics.
  • Understanding thermomechanical properties is crucial for advanced material design.
  • Existing auxetic structures lack tunable Poisson's ratios.

Purpose of the Study:

  • To investigate novel 2D composite structures with tunable thermomechanical properties.
  • To explore the influence of temperature on auxetic behavior.
  • To design materials with switchable Poisson's ratios.

Main Methods:

  • Utilizing auxetic geometries like anti-tetrachiral and re-entrant honeycomb.
  • Incorporating temperature-sensitive linking elements into composite structures.
  • Analyzing thermomechanical properties and Poisson's ratio variations with temperature.

Main Results:

  • Demonstrated temperature as a control parameter for effective Poisson's ratio.
  • Achieved tunability of Poisson's ratio from positive to negative values.
  • Confirmed thermoauxetic behavior in both void-filled and solid composite structures.

Conclusions:

  • Developed novel composite structures with temperature-tunable Poisson's ratios.
  • Thermoauxetic behavior offers new possibilities for smart material applications.
  • The findings are applicable to a range of composite designs, including those with voids.