${\epsilon }_e$	Yield strain;
${\epsilon }_b$	Hardening strain;
${\epsilon }_u$	Ultimate strain;
${\sigma }_e$	Yield stress;
${\sigma }_b$	Hardening stress;
${\sigma }_u$	Ultimate stress;
$E$	Elastic Modulus;
$k$	Slope of hardening stage;
$\Delta {\epsilon }_b$	Length of yield platform;
$j_1$	Uncorroded part;
$j_2$	Corroded part with variable cross-section;
$j_3$	Uniform corroded part;
$r_1$	Cross-sectional radius of uncorroded part;
$r_2\left(x\right)$	Cross-sectional radius of corroded part with variable cross-section;
$r_3$	Cross-sectional radius of uniform corroded part;
$l_1$	Axial original length of uncorroded part;
$l_2$	Axial original length of corroded part with variable cross-section;
$l_3$	Axial original length of uniform corroded part;
$l$	Total length of the half physical model;
$\Delta l_1$	Elongation of uncorroded part;
$\Delta l_2$	Elongation of corroded part with variable cross-section;
$\Delta l_3$	Elongation of uniform corroded part;
$\Delta l$	Total elongation of three parts;
F	Axial tensile force;
$\overline{\epsilon }$	Average strain of the corroded steel bar;
$\sigma$	Nominal stress of the corroded steel bar;
$A$	Original cross-sectional area of the uncorroded steel bar;
$A_1$	Cross-sectional area of uncorroded part;
$A_2\left(x\right)$	Cross-sectional area of corroded part with variable cross-section;
$A_3$	Cross-sectional area of uniform corroded part;
$F_{e1}$	Yield load of uncorroded part;
$F_{u1}$	Ultimate load of uncorroded part;
$F_{e3}$	Yield load of uniform corroded part;
$F_{u3}$	Ultimate load of uniform corroded part;
β	Slope angle of corroded part with variable cross-section;
${\xi }_A$	Loss rate of the cross-sectional area;
$\left[{\xi }_A\right]$	Critical loss rate of the cross-sectional area;
$F_{max}$	Ultimate load of the corroded steel bar;
$\overline{{\sigma }_u}$	Ultimate strength of the corroded steel bar;
∆r	Reduction of the cross-section radius;
[${\epsilon }_e,{\epsilon }_b$]	Strain interval of the yielding platform of the mild steel;