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Shear response of calcareous sand-steel snake skin-inspired interfaces
Calcareous sand-steel interfaces are common in offshore construction and contribute an important role in the overall load transfer and stability of offshore systems. In this paper, a modified interface direct shear apparatus is used to conduct a series of interface shear tests between calcareous sand and steel surfaces with asymmetric, morphologic profiles inspired by ventral snake scales. Test results showed that the peak and residual interface shear strengths and the dilatancy are greater when calcareous sands are sheared against the scales (cranial shearing) than when calcareous sands are sheared along the scales (caudal shearing). Furthermore, the increase in the normal stresses leads to a higher peak shear strength while lower interface peak friction angle and dilatation angle. The increase in the ratio of asperity length L to asperity height H leads to lower peak shear strength, interface peak friction and dilatation angles, and weaker strain softening. The particle breakage of the calcareous sand under interface shearing is affected by the normal stresses developed and the geometry of the steel surface. The relationships among the peak friction angle, the normalized normal stresses, and the roughness can be obtained by a three-dimensional logarithmic surface, which also satisfactorily captures the dilatation angle and particle breakage index.
Shear response of calcareous sand-steel snake skin-inspired interfaces
Calcareous sand-steel interfaces are common in offshore construction and contribute an important role in the overall load transfer and stability of offshore systems. In this paper, a modified interface direct shear apparatus is used to conduct a series of interface shear tests between calcareous sand and steel surfaces with asymmetric, morphologic profiles inspired by ventral snake scales. Test results showed that the peak and residual interface shear strengths and the dilatancy are greater when calcareous sands are sheared against the scales (cranial shearing) than when calcareous sands are sheared along the scales (caudal shearing). Furthermore, the increase in the normal stresses leads to a higher peak shear strength while lower interface peak friction angle and dilatation angle. The increase in the ratio of asperity length L to asperity height H leads to lower peak shear strength, interface peak friction and dilatation angles, and weaker strain softening. The particle breakage of the calcareous sand under interface shearing is affected by the normal stresses developed and the geometry of the steel surface. The relationships among the peak friction angle, the normalized normal stresses, and the roughness can be obtained by a three-dimensional logarithmic surface, which also satisfactorily captures the dilatation angle and particle breakage index.
Shear response of calcareous sand-steel snake skin-inspired interfaces
Acta Geotech.
Xiao, Yang (author) / Cui, Hao (author) / Shi, Jinquan (author) / Qiao, Wenhao (author) / Stuedlein, Armin W. (author)
Acta Geotechnica ; 19 ; 1517-1527
2024-03-01
11 pages
Article (Journal)
Electronic Resource
English
Calcareous sand , Dilatation angle , Peak friction angle , Snake scale-inspired surface Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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