Abstract
KITAZAWA1 investigated stress relaxation in wood maintained at a constant compressive strain for c. 600 min., and contended that Maxwell's relation: 
where F is the applied force at time t, F
0 the initial force on the specimen and τ the relaxation time of the material, did not fit his experimental data. He proposed instead an empirical equation: 
where F
1 is the force after unit time and m a constant. The applicability of this equation for times greater than the range of the experiment was not questioned, and the equation has recently been quoted by Hearmon2, also without restricting the time-range.
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References
Kitazawa, G., Syracuse Univ. Tech. Pub., No. 67 (1947).
Hearmon, R. F. S., in “Mechanical Properties of Wood and Paper”, by Barkas, W. W., Hearmon, R. F. S., and Rance, H. F., edit. by R. Meredith (North-Holland Pub. Co., Amsterdam, 1953).
Thomson, J. J., “Applications of Dynamics to Physics and Chemistry” (Macmillan, London, 1888).
Wiechert, E., “Ueber elastische Nachwirkung”, dissertation, Königsberg University (1889).
Wiechert, E., Ann. Phys. u. Chem., 50, 335, 546 (1893).
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GROSSMAN, P. Stress Relaxation in Wood. Nature 173, 42–43 (1954). https://doi.org/10.1038/173042a0
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DOI: https://doi.org/10.1038/173042a0
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