PA

loading level

$r\left(t\right)$

${\sigma }_{0.3}$

${\sigma }_{0.4}$

${\sigma }_{0.5}$

$25.3626-23.5786{\text{e}}^{-0.1t}+23.8311{\text{e}}^{-0.05t}-18.0708{\text{e}}^{-0.02t}$

$35.1104-40.6847{\text{e}}^{-0.1t}+47.1203{\text{e}}^{-0.05t}-32.7179{\text{e}}^{-0.02t}$

$45.6491-46.1334{\text{e}}^{-0.1t}+56.2102{\text{e}}^{-0.05t}-43.5065{\text{e}}^{-0.02t}$

PA + UDD

loading level

$r\left(t\right)$

${\sigma }_{0.3}$

${\sigma }_{0.4}$

${\sigma }_{0.5}$

$25.3102-26.9200{\text{e}}^{-0.1t}+32.8715{\text{e}}^{-0.05t}-24.0642{\text{e}}^{-0.02t}$

$33.0484-31.1413{\text{e}}^{-0.1t}+33.8989{\text{e}}^{-0.05t}-26.9547{\text{e}}^{-0.02t}$

$41.1932-40.9358{\text{e}}^{-0.1t}+46.6029{\text{e}}^{-0.05t}-35.6518{\text{e}}^{-0.02t}$

PA + CNT

loading level

$r\left(t\right)$

${\sigma }_{0.3}$

${\sigma }_{0.4}$

${\sigma }_{0.5}$

$21.6266-22.9993{\text{e}}^{-0.1t}+26.2085{\text{e}}^{-0.05t}-19.1740{\text{e}}^{-0.02t}$

$28.5471-33.5503{\text{e}}^{-0.1t}+36.0275{\text{e}}^{-0.05t}-24.5412{\text{e}}^{-0.02t}$

$36.5119-40.9524{\text{e}}^{-0.1t}+43.0930{\text{e}}^{-0.05t}-30.5410{\text{e}}^{-0.02t}$