Modeling the anisotropic elasto‐plastic material behavior of paper and paperboard at finite deformations

Accurately modeling the material behavior of paper and paperboard is proven to be highly demanding. Most difficulties arise from pronounced anisotropic nature material. Additionally, differences in in-plane out-of-plane as well non-isochoric plasticity, which affects elastic behavior, further deepen issue at hand. Therefore, an model proposed, capable capturing elasto-plastic paperboard. The constitutive framework was derived a thermodynamically consistent manner, valid for finite deformations, accounting coupling behavior. influence orthotropic anisotropy on response introduced through concept structural tensors. A slight generalization part free energy made order incorporate densification effect. known yield criterion modified account some inconsistencies. Non-isotropic hardening considered by defining set coupled internal variables. model's capabilities were demonstrated simulating process folding creasing.