Bending Stiffness of Unsymmetrical Multilayered Corrugated Board: Influence of Boundary Conditions


  • Damian Mrówczyński Poznan University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland
  • Jolanta Pozorska Department of Mathematics, Czestochowa University of Technology, Armii Krajowej 21, 42-201 Czestochowa, Poland
  • Tomasz Garbowski Department of Biosystems Engineering, Poznan University of Life Sciences, Wojska Polskiego 50, 60-627 Poznan, Poland
  • Zbigniew Pozorski Institute of Structural Analysis, Poznan University of Technology, Piotrowo 5, 60-965 Poznan, Poland


Corrugated board, Bending stiffness, Multilayer unsymmetrical panels, Boundary conditions, Finite element analysis


In laboratory practice, several standards for testing the bending stiffness of corrugated board are used. There are often cases of tests where the results depend on the way the sample is placed on the supports. The problem arises when the board is five-ply (with two corrugated layers with different corrugation heights) or when the board has asymmetrically selected papers on the flat layers. This article focuses on the problem related to boundary conditions, with particular attention to the local effects of the support of the sample. Because the cardboard layers, both flat and corrugated, have a small thickness, a slight deformation of the papers can always be observed at the point of contact between the sample and the support, which affects the readings of the measured stiffness. The paper presents theoretical and numerical analyses showing how much the method of supporting the sample affects the measured bending stiffness of various samples. Numerical observations were compared with the results of analyses presented by other scientists as well as with experimental results.






Research Article or Brief Communication