Using Excel, plot the yield locus using Hills anisotropic yield function for R=0.8, 1.0, 1.5, 2.0,...

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Using Excel, plot the yield locus using Hills anisotropic yield function for R=0.8, 1.0, 1.5, 2.0, 4, and 6. Use eqn (3-31) for plane stress and a yield stress of 100 MPa in the 2 direction (Y). What is the yield stress in the thickness direction be for all of the R-values considered in this example? 2R 0 + 022 - 0102 - Y2 1 + R (3-31) Using Excel, plot the yield locus using Hills anisotropic yield function for R=0.8, 1.0, 1.5, 2.0, 4, and 6. Use eqn (3-31) for plane stress and a yield stress of 100 MPa in the 2 direction (Y). What is the yield stress in the thickness direction be for all of the R-values considered in this example? 2R 0 + 022 - 0102 - Y2 1 + R (3-31)