Fig. 8.

Seventy very small-strain unloading cycles are applied: $0<\mathrm{\Delta }{\epsilon }_q^{\text{unloading}}<\sqrt{2/3}R$ with $\mathrm{\Delta }{\epsilon }_q^{\text{unloading}}=3·{10}^{-5}$ and $\mathrm{\Delta }{\epsilon }_q^{\text{reloading}}=1.7·{10}^{-4}$: The higher the ${\chi }_0={\chi }_{\text{max}}$ is, the more pronounced is overshooting for IGS. a, d stress paths in $p^{\prime }$-q planes, b, e q-${\epsilon }_q$ planes, c, f q-N planes