Modelling the impact of crushing on the strength performance of corrugated fibreboard

• Published in: Packaging technology & science Vol. 33; no. 4-5; pp. 159 - 170
• Main Authors: Jamsari, Mohamad Aiman, Kueh, Celia, Gray‐Stuart, Eli M., Dahm, Karl, Bronlund, John E.
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01.04.2020
• Subjects: bending stiffness; Callipers; Compressive strength; Crush tests; edge crush test (ECT); Equivalence; Exact solutions; Failure mechanisms; finite element (FE) analysis; flute profile; Geometry; Level (quantity); Modelling; orthotropic material; Performance prediction; Stiffness
• ISSN: 0894-3214; 1099-1522
• DOI: 10.1002/pts.2494

This paper presents different ways of modelling the strength of corrugated fibreboard (CFB) subjected to different levels of pre‐crushing. The strength performance was measured through four‐point bending loading and edge crush test (ECT). The models used in this study were an analytical solution, an equivalent flute model, and detailed flute geometry models that consisted of idealized sine geometry and real geometry. The study found that the bending performance was dependent on the calliper of CFB rather than the flute geometry. All models showed a similar trend in predicting the drop in bending stiffness as the level of pre‐crushing increased, albeit with different absolute value. It was found that the real geometry model of the board predicted ECT performance better than the other models. However, at severe pre‐crushing levels (>50%), there was a significant drop in the experimental ECT force not predicted by the models. For these cases, there was evidence of delamination of the flute, a failure mechanism that was not included in any of the models. The analytical solution model provides the quickest prediction but could not predict the crushed ECT performance due to not considering the calliper variable in the equation. The equivalent model showed faster solving time compared with both real and idealized geometry models, although these microgeometry models predicted ECT the most accurately. This paper presents different ways to predict the strength of corrugated fibreboard through finite element modelling and analytical solution on four‐point bending test and edge crush test. In addition, the impact of the crushed flute structure that can be typically seen was also included in the models through reducing caliper and including the crushed flute profile. The outcome from this study discussed the difference between each model in predicting the strength of corrugated fibreboard and what more is missing from the models.