LOCAL BUCKLING AND COLLAPSE OF CORRUGATED BOARD UNDER BIAXIAL STRESS

The collapse mechanism of biaxially loaded corrugated board cylinders with the corrugations parallel to the cylinder axis has been experimen tally examined. Axial compression, torque, external pressure and combi nations thereof were examined. The cylinder dimensions were sized to a void global buckling prior to failure of the material using finite ele ment analysis (FE). Failure analysis of the board was based on the str ess state in the facings in conjunction with a combined stress failure criterion (Tsai-Wu quadratic criterion). For cylinders under compress ion parallel to the corrugations, local buckling was observed but did not influence the collapse load. For biaxial load cases involving subs tantial shear and compression perpendicular to the corrugations, the e xperimental collapse stresses were substantially below predictions bas ed on stresses in the facings in conjunction with the failure criterio n. Such a discrepancy is explained by the tendency of the facings to b uckle locally before material failure. Consequently, local buckling ap pears to govern failure of corrugated board when there are large trans verse normal and shear stresses acting. (C) 1997 Elsevier Science Ltd.