Table 1 Geometrical parameters of bio-inspired surfaces: (a) characteristics of surfaces tested in this study; (b) illustration of a snakeskin-inspired surface and two-way shearing.

From: Interface frictional anisotropy of dilative sand

No

Type

Scale length, L [mm]

Scale height, H [mm]

N [ ]

(a)

 1

Textured

6

0.3

12

 2

12

0.1

6

 3

12

0.3

6

 4

12

0.72

6

 5

18

0.3

4

 6

24

0.3

3

 7

Untextured

(b)

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  1. N indicates the number of surface scales. The total length of surface scales is fixed as 72 mm in all plates.