The position of neutral surface of integrally stiffened panel is important for parameter design and
structural analysis, together with bending process. In engineering, the centriod is treated as the position of integrally
stiffened panel in elastoplastic bending, and there is large error for this method. In this work,a new method for the
calculation of neutral surface position is set up, considering the strain鄄hardening of a material, and the result is com鄄
pared with that of numerical simulation. Result shows: the neutral surface of integrally stiffened panel in elastic ben鄄
ding lies in the centriod, and it moves to skin side as bending radius getting smaller in plastic bending; when the rela鄄
tive bending radius is small (籽/ t逸10), thinning of panel is ignorable, and neutral surface of stress and strain lie at
almost the same position.