What is the poisson's ratio of timber?

The Poisson's ratio of timber typically ranges from 0.2 to 0.5, depending on the species and moisture content. This ratio measures the material's tendency to deform in the lateral direction when subjected to axial stress. Due to the anisotropic nature of timber, its Poisson's ratio can vary significantly in different directions (longitudinal, radial, and tangential). Therefore, it's essential to consider the specific type of timber and its orientation when assessing its Poisson's ratio.