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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

1.9K
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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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

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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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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Poisson's And Laplace's Equation01:25

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The electric potential of the system can be calculated by relating it to the electric charge densities that give rise to the electric potential. The differential form of Gauss's law expresses the electric field's divergence in terms of the electric charge density.
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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Hooke's Law01:26

Hooke's Law

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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Negative Poisson's Ratio in Modern Functional Materials.

Chuanwei Huang1, Lang Chen2

  • 1Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University, Nanshan District, Shenzhen, 518060, Guangdong, China. cwhuang@szu.edu.cn.

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Summary

Materials exhibiting a negative Poisson

Keywords:
functional materialsnegative Poisson's rationegative compressibilitynegative thermal expansion

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Materials with a negative Poisson's ratio (auxetic materials) possess unique mechanical properties, making them valuable for demanding applications.
  • These properties stem from their specific microstructures and offer advantages over conventional materials, especially in aerospace and defense.
  • Existing research covers theoretical and experimental aspects, but a consolidated review is needed.

Purpose of the Study:

  • To review recent advancements in materials with a negative Poisson's ratio.
  • To discuss the relationship between material structure and negative Poisson's ratio across different scales.
  • To explore correlations with other negative material properties and identify future research directions.

Main Methods:

  • Comprehensive literature review of theoretical and experimental studies on negative Poisson's ratio materials.
  • Analysis of structure-property relationships in bulk, nanoscale, and thin-film materials.
  • Investigation of the interplay between negative Poisson's ratio and other negative material characteristics.

Main Results:

  • Detailed overview of recent progress in auxetic materials research.
  • Demonstration of the structure-dependent nature of the negative Poisson's ratio.
  • Exploration of the coexistence of negative Poisson's ratio with negative compressibility and negative thermal expansion.

Conclusions:

  • Materials with a negative Poisson's ratio offer significant potential due to their unique mechanical enhancements.
  • Understanding the structure-property relationship is key to designing advanced auxetic materials.
  • Further research is needed to explore novel applications and fully harness the capabilities of these materials.