Avalanches in wood compression

Abstract

Wood is a multi-scale 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 response exhibits clear signatures of localization of deformation to "weak spots" or softwood layers, as identified using Digital Image Correlation. Even though material structure-dependent localization takes place, the avalanche behavior remains scale-free.

5 pages, 5 figures

References in corpus (3)

• Statistical Models of Fracture
• Statistics of acoustic emission in paper fracture: precursors and criticality
• Relaxation of creep strain in paper

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