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The application of the rate theory of deformation to the yield behaviour of wood


The yield behaviour of wood is assumed to result from the stress-assisted thermally activated motion of elementary fibrils over short-range barriers. The barrier energy is taken to be a linear decreasing function of increasing moisture content and the activation volume a linear increasing function of increasing moisture content. The flow stress equation obtained from the application of the rate theory is given by {ie264-01}

The theory has been examined in relation to the strain-rate and moisture dependence of the maximum longitudinal crushing stress ofPinus radiata andKahikatea. The data for these woods follow fairly closely the general expectations of the theory and the measured activation volumes are not inconsistent with the thermally activated motion of elementary fibrils.

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Ferguson, W.G., Yew, F.K. The application of the rate theory of deformation to the yield behaviour of wood. J Mater Sci 12, 264–272 (1977). https://doi.org/10.1007/BF00566266

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  • Polymer
  • Fibril
  • Flow Stress
  • Barrier Energy
  • Measured Activation