摘要: This paper reviews 2D auxetic models, including 3D deformation models with behavior, from mechanism perspective instead of geometrical perspective. On this basis, across different groups can be regrouped into clusters that exhibit analogy in mechanism. Factors are taken consideration include the identification corresponding (i) rotation and non-rotation units, as well (ii) linkages/joints between units non-linkages/non-joints various models. As a result, five have been identified, which within each cluster analogous to other. The identified those exhibit: (a) double periodicity direction their rotating (b) synchronized (c) single (d) random (e) units. Results place systematic representation will enrich future development particularly do not fall these clusters. It is proposed work includes ordering according joints or linkage geometries.