Fig 1.
Applications of the buffer cushion.
Fig 2.
Structure of the single cell elements:
(a) Basic structure. (b) Inner concave negative Poisson’s ratio cell structure. (c) Hexagonal cell structure [2].
Table 1.
Orthogonal test factor level.
Table 2.
The results of the orthogonal design of the experiments.
Table 3.
Structural parameters of the negative Poisson’s ratio cell elements.
Table 4.
Mechanical and physical properties of the ABS material [40].
Fig 3.
Deformation cloud of two 3D single cell structures after compression:
(a) Inner concave negative Poisson’s ratio structure. (b) Hexagonal structure.
Fig 4.
Inner concave negative Poisson’s ratio structure and hexagonal structure of multi cell elements:
(a) Inner concave negative Poisson’s ratio structure multi cell element. (b) Hexagonal structure multi cell element.
Fig 5.
Deformation cloud maps of two multi cell structures:
(a) Inner concave negative Poisson’s ratio structure multicellular element. (b) Hexagonal structure multi cell element.
Fig 6.
Inner concave negative Poisson’s ratio single cell considering scale effects.
Fig 7.
The cross-sectional view models of an inner concave negative Poisson’s ratio buffer cushion and its application scenarios.
Table 5.
Grid convergence analysis of inner concave negative Poisson’s ratio structural buffer cushion.
Table 6.
Grid convergence analysis of hexagonal structural buffer cushion.
Fig 8.
(a) Inner concave negative Poisson’s ratio buffer cushion and (b) Hexagonal buffer cushion.
Fig 9.
Compression experiments of buffer cushions:
(a) Inner concave negative Poisson’s ratio structure. (b) Hexagonal structure.
Table 7.
Compression experiments related statistical data.
Fig 10.
Comparison of the displacements in the y-direction for the
(a) Inner concave negative Poisson’s ratio structural buffer cushion and (b) Hexagonal structural buffer cushion.
Fig 11.
Comparison curves between simulation and experiment for the
(a) Inner concave negative Poisson’s ratio structural buffer cushion and (b) Hexagonal structural buffer cushion.
Fig 12.
Dynamic impact stress contour plots of the
(a) Inner concave negative Poisson’s ratio structural buffer cushion. (b)Hexagonal structural buffer cushion.