AN ALTERNATIVE FORMULATION FOR INTERPOLATING EXPERIMENTAL YIELD SURFACES

In an earlier article (see Gupta & Meyers [1992]), a yield function of second and third invariants of translated deviatoric stress tensor was presented that describes the secondary effects in initial yield surfaces as well as the distortions, rotations, and translations in the subsequent yield surfaces quite well. In this article, we present an alternative formulation that is relatively simple and is also able to interpolate the experimental yield surfaces quite well. Its applicability is demonstrated by the comparison with initial and subsequent yield surfaces obtained after partial and total unloading from uniaxial and biaxial prestrains.