Shear behaviour of snakeskin-inspired ribs and soil interfaces

Gayathri, V. L.; Vangla, Prashanth

doi:10.1007/s11440-023-02009-w

Cited by 3 publications

(1 citation statement)

References 63 publications

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“…Hence, digging out more cuttings and particles. The technique is similar to the snakeskin-inspired compliant surfaces which used for supporting piles and structures on loose soil by anisotropic friction in both directions, [31][32][33][34]. The main enhancements over the DRD include; having a compact and portable design for easily attaching with exploration vehicles, having easy-changeable cams and wedges with different inclination angles without modifying the entire design for obtaining various reciprocation and oscillation amplitudes, and having a sample compartment with extended lengths along the drill stem.…”

Section: Drod's Concept and Designmentioning

confidence: 99%

DROD: bio-robotic drill/sampler for planetary subterranean exploration: experiments and challenges

Alkalla,

Pitcher

2023

Bioinspir. Biomim.

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Key features for space exploration equipment, and in particular drills and sampling mechanisms, are low weight, small size, and energy efficiency. These characteristics are substantially required not only in reducing the spaceship flight cost, but also in extending the exploration time on the extraterrestrial bodies. This article experimentally investigates the feasibility of a novel drill bioinspired by wood-wasp and sand-fish lizard as an integrated robotic solution for rover exploration tasks. A new penetration depth of 820 mm in terms of reciprocation drilling technique has been achieved by the proposed dual reciprocation and oscillation drill (DROD), especially with the new enhancements such as miniature sample compartment and toothed stems. Additionally, a first sampling experiment with DROD has been performed and a sample amount of 20 g and size of 30 cm3 has been collected successfully. Finally, the article provides developments for integration of DROD with rovers for future exploration missions and potentials for horizontal drilling for subterranean applications.

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Section: Drod's Concept and Designmentioning

confidence: 99%

DROD: bio-robotic drill/sampler for planetary subterranean exploration: experiments and challenges

Alkalla,

Pitcher

2023

Bioinspir. Biomim.

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A versatile apparatus for assessing the shear behaviour of geotechnical interfaces coupled with imaging and acoustic capabilities

Gayathri,

Vangla,

Dey

2024

Acta Geotech.

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Direction-dependent failure envelopes of sand-structure interfaces with snakeskin-inspired surfaces

O'Hara,

Martinez

2024

Can. Geotech. J.

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Snakeskin-inspired surfaces generate direction-dependent interface strengths, with shearing in the cranial direction generating greater strength than in the caudal one. This directionality is enabled by the transfer of load in friction and passive resistances. It is unclear if failure of these interfaces can be captured by models used for purely frictional interfaces. Interface shear tests complemented with Particle Image Velocimetry (PIV) analyses were performed on snakeskin-inspired surfaces with different asperity geometries and on reference rough and smooth surfaces. The results of experiments performed at different initial effective stresses under Constant Normal Stiffness (CNS) boundary conditions show significant dilation-induced increases in effective stress. These increases were greater during cranial than caudal shearing, producing greater cranial strengths. These surfaces yielded non-linear failure envelopes, with greater shear to effective stress ratios at smaller effective stresses, while the rough and smooth surfaces mobilized linear failure envelopes. The PIV analyses indicate that the snakeskin-inspired surfaces induce localized strains in the vicinity of the asperities, leading to wavy failure planes. The average shear strains are correlated with the mobilized shear strengths, with increases in effective stress leading to decreases in both strains and stress ratio.

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Shear behaviour of snakeskin-inspired ribs and soil interfaces

Cited by 3 publications

References 63 publications

DROD: bio-robotic drill/sampler for planetary subterranean exploration: experiments and challenges

DROD: bio-robotic drill/sampler for planetary subterranean exploration: experiments and challenges

A versatile apparatus for assessing the shear behaviour of geotechnical interfaces coupled with imaging and acoustic capabilities

Direction-dependent failure envelopes of sand-structure interfaces with snakeskin-inspired surfaces

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