\(p=\frac{\varepsilon_{\text{eq}}^{p}}{\varepsilon_{\text{eq},\text{crit}}^{p}}\) , \(\varepsilon_{\text{eq}}^{p}\left(t\right)=\sqrt{\frac{2}{3}}\int_{0}^{t}{\sqrt{{\dot{\varepsilon}}^{p}:{\dot{\varepsilon}}^{p}}\text{dτ}}\ \),