Publications Details

Experimentally Determined Anisotropic Yield Surfaces for Al 7079

Smith, Scott H.

Isotropic von Mises and anisotropic Hill yield surfaces for Al 7079 were fit using experimental data gathered from 12 dog-bone specimens that captured the highly variable microstructural texture of the aluminum alloy. Strain gauges or the digital image correlation technique were utilized to determine the strain histories in the specimen as they were subjected to uniaxial tension. The final yield surface fits displayed a high degree of variability that was dependent upon how the yield functions were calculated, i.e. which size and shape information was used. The findings display that a model with a higher number of anisotropic parameters is needed to better and more consistently capture the anisotropic properties of Al 7079, such as the Barlat, Yld2004-18, model that has 20 parameters.