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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

399
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...
399
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

263
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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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Adjustable Ultra-Light Mechanical Negative Poisson's Ratio Metamaterials with Multi-Level Dynamic Crushing Effects.

Xiang Xu1, Chuanqiang Huang1, Chongchong Li1

  • 1School of Engineering, Anhui Agricultural University, Hefei, 230036, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 15, 2024
PubMed
Summary

This study introduces mechanical metamaterials with multi-level dynamic crushing effects (MM-MLs) for adaptive protection. These MM-MLs exhibit controllable two-level platform stress and tunable energy absorption, offering functional diversity.

Keywords:
Dynamic impactenergy absorptionmetamaterialsmulti‐level crushing effects

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metamaterials

Background:

  • Mechanical metamaterials (MMs) are engineered materials with unique properties derived from their structure.
  • Dynamic crushing effects in MMs are crucial for energy absorption applications, such as impact protection.
  • Existing MMs often lack the tunable multi-level crushing characteristics required for adaptive protection.

Purpose of the Study:

  • To design and investigate mechanical metamaterials with multi-level dynamic crushing effects (MM-MLs).
  • To explore the influence of structural parameters on the mechanical properties and crushing behavior of MM-MLs.
  • To demonstrate the potential of MM-MLs for adaptive crushing protection applications.

Main Methods:

  • Design of MM-MLs using coordinate transformation and mirror arrays.
  • Systematic investigation of the effects of strut/rod ratios, Euler angles, and cell numbers on mechanical properties.
  • Analysis of two-level platform stress, rotational motion, collapse compression, and bending during crushing.

Main Results:

  • MM-MLs exhibit significant two-level platform stress, with distinct deformation mechanisms in each stage.
  • Increasing connecting rod length enhances Poisson's ratio range but reduces platform stress and energy absorption.
  • Optimizing Euler angles and increasing cell numbers improve energy absorption capacity and overall performance.

Conclusions:

  • MM-MLs demonstrate significant parameter controllability, enabling tailored platform stress, Poisson's ratio, and energy absorption.
  • The designed MM-MLs offer functional diversity compared to existing metamaterials.
  • This design scheme provides a foundation for developing adaptive crushing protection systems.