Abstract
An elastic stress formulation was expressed for the square tubular case (CFBS : anisotropic panel) of the corrugated fiber board box shape (width L, height h) under uniform compression py0 at centers in upper and lower edges. Then from this formulation the stress analysis is performed, and maximum values (σxmax, σymax, τxyma, σ1min and τ1max) for normal stresses σx and σy to width and height directions and shear stressτxy, principal stressσ1 and principal shear stress τ1 were obtained and characteristic behaviors for σxmax, σymax, τxymax, σ1min and τ1max were discussed.
Rates of values σx and τxy for the anisotropic case to the isotropic are about νxy Ex⁄Ey and σymin⁄ (σymin-σxmin) respectively. Ex and Ey are elongational elastic moduli in width and height directions and νxy is Poisson’s ratio (strain effect for height direction normal strain to width direction normal strain) . Positions of σymin and σ1min are in the loading range of upper and lower edges and are independent of the case shape change, and τxymax and τ1max change as be at positions of distance L⁄2±Δx from corners in upper and lower edges with increases of L and the loading range.
