The validity of the t1/3law of flow of metals

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Abstract
The validity of the t 1/3 law has been tested by fitting a power formula with an exponent other than 1/3 to experimental records made by the method of simple shear and finding, by the method of least squares, the average error for different values of the exponent. For smaller stresses it has been found that the least average error corresponds to 1/3, for higher stresses that the least average error is for a value of the exponent somewhat greater than 1/3. It has been shown that a t 1/3 flow to which a small flow linear with t is added can be closely fitted with a power law with, an exponent greater than 1/3, the value of the exponent for least average error increasing with the relative amount of linear flow. The experiments on record from which higher exponents have been deduced were carried out with comparatively rapid flow and the higher values are explicable by a linear time flow component. Examination of surface photomicrographs of specimens of lead flowing at constant simple shear stress has shown that the measured strain can be precisely accounted for by intragranular shear accompanied by small intergranular displacement. The strain due to grain displacement has been found to be proportional to the time, both in forward and reversed flow.

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