Related Experiment Video
Updated: Mar 26, 2026
09:39
Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
Published on: June 28, 2024
1.7K
Hyperbolically Patterned 3D Graphene Metamaterial with Negative Poisson's Ratio and Superelasticity
Qiangqiang Zhang1,2,3,4, Xiang Xu1,2, Dong Lin5
1Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology), Harbin, 150090, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|January 21, 2016
Summary
Researchers developed a 3D graphene metamaterial with a negative Poisson
Area of Science:
- Materials Science
- Nanotechnology
- Mechanical Engineering
Background:
- Graphene metamaterials (GM) offer unique mechanical properties.
- Designing materials with tunable mechanical responses is crucial for advanced applications.
Purpose of the Study:
- To synthesize a hyperbolically patterned 3D graphene metamaterial (GM).
- To investigate the tunable negative Poisson's ratio and superelasticity of the GM.
- To explore potential applications of the developed GM.
Main Methods:
- Modified hydrothermal synthesis.
- Oriented freeze-casting strategy.
- Characterization of structural and mechanical properties.
Main Results:
- Successfully synthesized a 3D graphene metamaterial with hyperbolic patterning.
- Demonstrated tunable negative Poisson's ratio and superelasticity.
- Poisson's ratio can be adjusted by controlling porosity, aspect ratio, and freeze-casting conditions.
Conclusions:
- The developed 3D graphene metamaterial exhibits desirable tunable mechanical properties.
- The material shows significant potential for applications in soft actuators, sensors, shock absorbers, and environmental remediation.
Related Concept Videos
01:23Poisson's Ratio
2.0K
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...
2.0K
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
680
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.
680
01:22Generalized Hooke's Law
3.0K
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
3.0K
01:21Deformations in a Transverse Cross Section
711
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.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
711
01:26Hooke's Law
1.8K
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.
1.8K
01:27Gauss's Law: Planar Symmetry
10.0K
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
10.0K