Elastic Bending Stress Analysis of Fracture Line Generation for Case (Square Tube) of Corrugeted Fiberboard Box Shape under Uniform Compression Loading (On Panel Height/Width=0.8-2)

Abstract

An elastic bending deformation analysis of fracture line generation for anisotropic side plates [width L=60-120mm, height h= (0.8-2) L and longitudinal elastic coefficients Ex=2.94×103N/mm2 and Ey=1.24×103N/mm2 in width and height directions and Poisson's ratio νxy=0.10 for width direction strain effect to height direction strain] in the case (square tube panel) of the corrugated fiberboard box shape (CFCBS) under uniform compression loading py0 was considered. Deflection W of side plates distributes symmetrically to center lines of width and height directions and becomes the distribution pattern of the convex-concave shape on outer surfaces of side plates. And rate h'*/L (h'* : maximum distance between upper or lower surface and fracture line) becomes nearly constant in range h/L>0.8 and fracture lines for side plates become curves of sine square root in similar figures, and independently of the change of h. Their fracture lines are denoted by the position which loading stress is equal to compression strength per unit area. And the shape of side plates made by fracture lines is similar to the barrack shape. Total load for fracture line generation is nearly constant.