Summary
A two-surface theory based upon experimental results is presented. The theory utilizes the concept of a yield surface and a loading surface to describe the essential features of the time-independent inelastic behavior of materials. The theory is implemented in a computer program and its predictions are compared to a variety of axial-torsional experimental data including both proportional and nonproportional loading.
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Lu, W.Y., Mohamed, Z.M. A two-surface plasticity theory and its application to multiaxial loading. Acta Mechanica 69, 43–57 (1987). https://doi.org/10.1007/BF01175713
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DOI: https://doi.org/10.1007/BF01175713