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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Adaptive Mechanical Metamaterials with On-Demand Binary Local Modulus for Embodied Intelligence.

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Summary
This summary is machine-generated.

Researchers developed adaptive mechanical metamaterials (AMMs) using strain-responsive binary meta-capsules. These materials can instantly change stiffness, enabling self-optimization and adaptable 3D/4D printing applications.

Keywords:
adaptive materialsadditive manufacturingembodied intelligencemechanical metamaterialson‐demand

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Robotics

Background:

  • Biological materials exhibit inherent adaptability through environmental interaction.
  • Artificial materials struggle to replicate this adaptability and self-optimization.
  • Controlling local material properties dynamically is a significant engineering challenge.

Purpose of the Study:

  • To introduce a mechanism for instantaneous local stiffness changes in response to strain.
  • To develop a new class of adaptive mechanical metamaterials (AMMs).
  • To enable self-optimizing and reconfigurable artificial materials.

Main Methods:

  • Designing binary meta-capsules with two discrete stiffness states (0 and 1).
  • Utilizing strain-induced state switching in meta-capsules.
  • Employing computational tools for design guidance.
  • Fabricating AMMs using multi-material polymer jetting.
  • Conducting mechanical experiments (compression, indentation) to validate functionality.

Main Results:

  • Demonstrated instantaneous and reversible changes in local stiffness based on applied strain.
  • Confirmed the functionality of AMMs through mechanical testing.
  • Showcased the ability of AMMs to reconfigure properties after loading-unloading cycles.

Conclusions:

  • The developed AMMs can dynamically adjust local properties, effectively reprogramming themselves post-fabrication.
  • This breakthrough transforms 3D/4D printing into adaptive,
  • infinity-D
  • printing.
  • The strain-responsive mechanism offers a pathway to create truly adaptive artificial materials.