Poisson's Ratio is stress related. If you apply a stress in a given direction causing a strain, it quantifies what happens in lateral directions in terms of expansion/contraction for a given material.question4 said:
So in order to find the change of the diameter is it enough to say that : Δd= α*ΔΤ*d ?erobz said:
Well, I believe that formula is for ##\frac{\delta }{L} \ll 1##, but basically...yes.question4 said:
Yes, Poisson's ratio is a fundamental material property that describes the relationship between a material's lateral and axial strains. It is defined as the negative ratio of lateral strain to axial strain, and it remains constant regardless of the presence or absence of loadings.
Poisson's ratio is a dimensionless quantity that describes the ratio of a material's lateral strain to its axial strain under an applied stress. It is commonly denoted by the Greek letter ν (nu) and is typically between 0 and 0.5 for most materials.
Poisson's ratio can be measured through various experimental techniques, such as tensile testing, compression testing, or shear testing. It can also be calculated using theoretical models or obtained from material databases.
Yes, Poisson's ratio can be negative for certain anisotropic materials, such as auxetic materials. These materials have a negative Poisson's ratio, meaning that they expand laterally when stretched axially.
In most cases, Poisson's ratio is considered to be a material constant that does not vary with temperature or other environmental factors. However, for some materials, such as polymers, Poisson's ratio may exhibit slight changes with temperature due to thermal expansion effects.