Abstract
THE purpose of this communication is to direct attention to a similarity in the shape of stress–log time graphs relating to static stress relaxation in solid materials. For a number of high polymers and metals the following relation between the inflexion slope F of the stress–log time curves and the total decrease in stress Δσ was found: F is defined as (dσ/d ln t)inflexion. A condition for the applicability of equation (1) seemed to be absence of internal stresses, that is, careful annealing. The substances investigated were rubber hydrochloride1, polyethylene2,3, cellulose and paper4, polycrystalline and single crystal cadmium, indium, lead and tin5, and polycrystalline molybdenum6. Experiments have also been carried out on a number of other substances including polyisobutylene, polyvinyl acetate, beryllium, aluminium, Lipowitz's alloy, cetyl alcohol, and single crystals of lithium fluoride7.
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KUBÁT, J. Stress Relaxation in Solids. Nature 205, 378–379 (1965). https://doi.org/10.1038/205378a0
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DOI: https://doi.org/10.1038/205378a0
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