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Related Concept Videos

Poisson's Ratio01:23

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Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
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James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having combined existing knowledge of the laws of electricity and the laws of magnetism with his insights to form a complete overarching electromagnetic theory, represented by Maxwell's equations. The four basic laws of electricity and magnetism were discovered experimentally through the work of physicists such as Oersted, Coulomb, Gauss, and...
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Sequential metamaterials with alternating Poisson's ratios.

Amin Farzaneh1, Nikhil Pawar1, Carlos M Portela2

  • 1Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.

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Summary
This summary is machine-generated.

Researchers developed novel mechanical metamaterials that can passively alternate Poisson's ratios over time and space. This breakthrough enables smart materials for dynamic shape-morphing applications without external power or control.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Mechanical metamaterials typically achieve fixed Poisson's ratios through microarchitecture deformation.
  • Existing designs lack the ability to temporally and spatially alternate Poisson's ratios during deformation.
  • This limitation hinders the development of advanced smart materials for complex mechanical information processing.

Purpose of the Study:

  • To introduce novel periodic and graded mechanical metamaterials capable of passively alternating Poisson's ratios.
  • To enable dynamic shape-morphing applications by processing mechanical information through time-ordered signals.
  • To provide a design methodology and software tool for creating materials with user-specified alternating Poisson's ratios.

Main Methods:

  • Leveraging principles of differential stiffness and self-contact within the metamaterial microarchitecture.
  • Developing an analytical approach and a complementary software tool for designing materials in 2D and 3D.
  • Utilizing sequential deformation computations significantly faster than traditional finite-element methods.

Main Results:

  • Demonstrated passive, user-specified alternating Poisson's ratios in both periodic and graded metamaterials.
  • Validated the predicted alternating Poisson's ratios through experiments on macro- and micro-scale designs.
  • The developed software tool offers an order of magnitude speedup in sequential deformation computation.

Conclusions:

  • The introduced mechanical metamaterials offer a new paradigm for passive, programmable shape-morphing.
  • This work paves the way for smart materials that can dynamically respond to mechanical stimuli without active control.
  • The design tool accelerates the development of advanced metamaterials with complex, time-varying mechanical properties.