It is considered in the example
that the ratio of the Mises stress at a point to the maximum Mises stress that can be generated at the existing pressure (called DP= Yield Factor) will reach 1 when the material point undergoes yielding (plastic behavior);i.e. equivalent plastic strain (PEEQ) > 0 . I do not think this is the a right failure measure for strain hardening soils in which plastic strain will appear when DP < 1 (no failure yet). Do you agree with me.?
that the ratio of the Mises stress at a point to the maximum Mises stress that can be generated at the existing pressure (called DP= Yield Factor) will reach 1 when the material point undergoes yielding (plastic behavior);i.e. equivalent plastic strain (PEEQ) > 0 . I do not think this is the a right failure measure for strain hardening soils in which plastic strain will appear when DP < 1 (no failure yet). Do you agree with me.?