摘要：This paper presents a comparative study of the different formulations used in
research groups in Li`ege and Mendoza, for the modelling of large plastic
deformations. The comparison focused on a few academic standardized problems.
We analysed both the constitutive formulation (strain-stress relations) and
the finite element formulation (discretized mechanical balance equations). In
particular, we compared two constitutive formulations, both hyperelastic, but
resulting from different theoretical approaches. We also compared different
types of finite elements (4-noded quadrangles and 6-noded triangles), in
axisymmetric and plane strain settings. These comparisons show that both
approaches yield very similar results. Computations also show that models
based on 6-noded triangles give good results. The only limitation suggested by
the results obtained is that triangles appear to be more sensitive to large
distorsions than quadrangles.
