A question about Poisson's Ratio

Thread starter Pooty
Start date Feb 7, 2011
Tags

Poisson's ratio Ratio

In summary, Poisson's Ratio is a material property that describes the relationship between a material's strain in the direction of an applied force and its strain in the perpendicular direction. It is calculated by dividing the lateral strain by the axial strain. A high Poisson's Ratio (close to 0.5) indicates high compressibility and easy deformation in response to an applied force in any direction. While it does not directly affect the strength of a material, it can indirectly affect its ability to withstand stress and strain, as well as its stiffness and resilience. Poisson's Ratio can also be negative for certain materials, such as auxetic materials.

Feb 7, 2011

Pooty

Does Poisson's Ratio only apply to material still in the linear elastic range or is it still true for the material that has undergone plastic deformation?

Engineering news on Phys.org

Feb 7, 2011

Mapes

Science Advisor

Homework Helper

Gold Member

Linear elastic only; outside this region, measurements of Poisson's ratio will trend up to 0.5 (constant volume).

1. What is Poisson's Ratio?

Poisson's Ratio is a material property that describes the relationship between a material's strain in the direction of an applied force and its strain in the perpendicular direction.

2. How is Poisson's Ratio calculated?

Poisson's Ratio is calculated by dividing the lateral strain (strain in the perpendicular direction) by the axial strain (strain in the direction of applied force).

3. What does a high Poisson's Ratio indicate?

A high Poisson's Ratio (close to 0.5) indicates that the material is highly compressible and will easily deform in response to an applied force in any direction.

4. How does Poisson's Ratio affect the strength of a material?

Poisson's Ratio does not directly affect the strength of a material. However, it can indirectly affect the material's ability to withstand stress and strain, as well as its stiffness and resilience.

5. Can Poisson's Ratio be negative?

Yes, Poisson's Ratio can be negative for certain materials, such as auxetic materials, which exhibit unconventional properties such as becoming thicker when stretched and thinner when compressed.