Stress Strain Curves from the Ring Test
A new procedure for the establishment of stress strain curves from the ring test is described. The underlying upper bound theory, due to Avitzur, has been used to produce a very practical calibration chart for easy reduction of experimental data. The validity of the technique has been assessed by conducting ring tests and tensile/compression tests on cold aluminium and hot steel. It has also been shown that varying friction conditions and continuous or series testing methods do not invalidate the technique.
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