Summary
Viscoelastic bending loads resulting from prescribed deflections increasing continuously or stepwise from 0, 20, or 30% initial stress level (linear range) to 55 or 65% final stress level (non-linear range), i.e., within the proportional limit, were measured over a period of 10 h. Loads could be predicted by a numerical method using model element constants which were an experimentally determined function of deflection. An 8-element model consisting of a Maxwell model and three Voigt models in series was used. The upper limit of stress level where linear relation between creep strain and stress holds ranged from about 35 to 45%. Calculated load changes agreed well with experimental load changes.
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This research was supported in part by a Grant-in-Aid for Scientific Research, Ministry of Education, Japan. The author is indebted to Professor Arno P. Schniewind, Forest Products Laboratory, University of California, for critically reviewing the manuscript
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Mukudai, J. Evaluation of linear and non-linear viscoelastic bending loads of wood as a function of prescribed deflections. Wood Sci. Technol. 17, 203–216 (1983). https://doi.org/10.1007/BF00372319
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DOI: https://doi.org/10.1007/BF00372319