Abstract
The purpose of this paper is to present new methods and procedures used in the experimental determination of yield surfaces at room and at elevated temperatures. These procedures permit one to obtain a striking consistency in the results and to derive unambiguously laws of general validity. Experiments are presented in which thin-walled tubes of pure aluminum are loaded in combined tension and torsion, in the plastic range, at room temperature and at elevated temperatures to 325°F. Yield surfaces in stress space are obtained at several temperatures for the virgin material and for the material prestrained in torsion. It is shown that no cross effect exists at all tested temperatures and levels of prestraining. It is also shown that the yield surfaces do not pass through the prestressing point and that the yield surfaces do not enclose the origin even at very small values of prestressing. The paper ends with the introduction of a new method of determining the yield surface in stress-temperature space. In this method the loading path is non-isothermal and the experimental results verify the previously isothermally determined yield surface.
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