A simplified material model for finite element analysis of paperboard creasing

A simplified material model to model paperboard was proposed. Paperboard was modeled as a multilayered structure with a softening interface model connecting the paperboard plies. The paperboard plies were modeled using an anisotropic elastic model with a Hill yield surface and isotropic hardening. The model has less material constants than previous models, and the material constants can more easily be determined from uniaxial experiments. The model was tested by performing simulations of creasing of paperboard with a two dimensional finite element model, that mimiced a laboratory creasing device. Creasing experiments and simulations down to two different distances were performed, where the reaction force and displacement of the male ruler were measured. Simulations and experiements were performed both in the paperboard machine direction and cross machine direction. The forcedisplacement curves from the simulations and experiments were compared, with good agreement.