Evaluation of Hoffman and Xia plasticity models against bi-axial tension experiments of planar fiber network materials

The anisotropic properties and pressure sensitivity are intrinsic features of the constitutive response fiber network materials. Although advanced models have been developed to simulate complex fibrous materials, lack comparative studies may lead a dubiety regarding selection suitable method. In this study, pressure-sensitive Hoffman yield criterion Xia model implemented for plane stress case mechanical under bi-axial loading state. performance both is experimentally assessed by comparison tests on cruciform-shaped specimens loaded in different directions with respect material principal directions. measured forces shows ability as well shape parameter k ≤ 2 adequately predict response. However, study demonstrates that consistently presents stiffer when ≥ 3 compared model. This result highlights importance calibrating using test, which can be cumbersome task. Also, same tension-compression response, Hill special good conditions. Furthermore, terms stability criteria, unconditionally convex while convexity function orthotropic plastic matrix. not only assesses prediction capabilities two models, but also gives an insight into appropriate characterization simulation UMAT implementations available commercial software calibration tool shared open-source along work. • presented implementations. biaxial tension experimental measurements. To accurately calibrate test required. conditional. Neglecting asymmetric agreement experiment.