Avalanches in Wood Compression

Avalanches in Wood Compression.

Wood is a multiscale material exhibiting a complex viscoplastic response. We study avalanches in small wood samples in compression. "Woodquakes" measured by acoustic emission are surprisingly similar to earthquakes and crackling noise in rocks and laboratory tests on brittle materials. Both the distributions of event energies and of waiting (silent) times follow power laws. The stress-strain re...

Avalanches, plasticity, and ordering in colloidal crystals under compression.

Using numerical simulations we examine colloids with a long-range Coulomb interaction confined in a two-dimensional trough potential undergoing dynamical compression. As the depth of the confining well is increased, the colloids move via elastic distortions interspersed with intermittent bursts or avalanches of plastic motion. In these avalanches, the colloids rearrange to minimize their colloi...

Numerical Simulations of Transverse Compression and Densification in Wood

Numerical modeling, such as finite element analysis (FEA), of complex structures and complex materials is a useful tool for stress analysis and for failure modeling. Although FEA of wood as an anisotropic continuum is used, numerical modeling of realistic wood structures, including details of wood anatomy and variations in structure within specimens, has been beyond the capabilities of FEA and ...

Snow Avalanches, Ice Avalanches and Glacier Surges

Compression Molding of Green Composite made of Wood Shavings

Creation of recycle-based society is an important factor in order to resolve geoenvironmental issues that are happening recently. A general recycling method for wooden materials is to make engineered board from wasted woods. For example, particle board, fiber board, ply board are used widely in architectural industry and so on. However, these boards contain chemical compounds such as urea resin...