Investigation of the stretch moduli
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Text from page 15: Professor E. R. Hedrick, after plotting numerous curves from data obtained by the Watertown Arsenal, on testing strength of materials, found that in a great many determinations of the relation of the stress to the strain Hooke's Law was not always followed. This deviation from a direct proportion led Professor Hedrick to suggest an exponential function as best representing the relation between the stress and the strain.
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