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Canceling the elastic Poynting effect with geometry.

M Destrade1, Y Du2, J Blackwell1

  • 1School of Mathematical and Statistical Sciences, University of Galway, Galway H91 TK33, Ireland.

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Summary
This summary is machine-generated.

The Poynting effect in soft matter can be reversed from vertical expansion to shrinkage by altering the object's aspect ratio. This finding offers potential for eliminating vibrations in applications like seismic wave absorbers.

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Area of Science:

  • Soft Matter Physics
  • Nonlinear Mechanics
  • Materials Science

Background:

  • The Poynting effect describes the vertical expansion of soft blocks under horizontal shear.
  • This phenomenon is observed in incompressible, isotropic, hyperelastic solids with specific aspect ratios.
  • Understanding and controlling this effect is crucial for material applications.

Purpose of the Study:

  • To investigate the reversal of the Poynting effect in soft matter.
  • To determine the role of aspect ratio in controlling vertical displacement.
  • To explore methods for suppressing unwanted vertical vibrations.

Main Methods:

  • Experimental manipulation of cuboid aspect ratios.
  • Theoretical analysis of the classical Poynting effect.
  • Finite-element simulations to model and suppress the effect.

Main Results:

  • The Poynting effect can be reversed from expansion to vertical shrinkage by reducing the aspect ratio.
  • Cubes exhibit a reverse Poynting effect regardless of material properties.
  • Optimal aspect ratios can theoretically eliminate vertical displacements.

Conclusions:

  • The Poynting effect's direction is controllable via aspect ratio.
  • This control enables the design of materials for vibration damping.
  • The study provides a new perspective on nonlinear soft matter mechanics.