$(σ_x)_{max}$bending stress due to warping rigidity of the cross section$\mathrm{MPa}$
$(τ_1)_{max}$shear stress due to torsional rigidity of the cross section$\mathrm{MPa}$
$(τ_2)_{max}$shear stress due to warping rigidity of the cross section$\mathrm{MPa}$
$C_W$warping constant$\mathrm{mm^6}$
$E$modulus of elasticity of the material$\mathrm{MPa}$
$G$modulus of rigidity$\mathrm{MPa}$
$K$torsional stiffness constant$\mathrm{mm^4}$
$e$distance from a reference to the shear center;$\mathrm{mm}$