Wood

Wood is a bio-polymeric composite with complex physical and mechanical properties. It has a heterogeneous structure from micro to macro scales (Fig *). These heterogeneities and variation of humidity and temperature change the mechanical properties of different wood specimens from sample to sample. In wood material science, a special attention is paid to multi-scale modeling and taking the role of structural elements at smaller scales; fibers, ray cells and cellulose microfibrils in to account.

* Wood heterogeneities in different scales, photo by Marjan 2006