Abstract
This study investigates the influence of the wavelength of a tooth-shaped surface asperity (λ) on the characteristics of the fracture wavelength (λf) and the plane interface shear strength (τf). A total of 53 plane interface direct shear tests were conducted by changing the slope angle of surface asperity, wavelength of surface asperity, and normal stress. The fracture characteristics of the surface asperity were classified in three progressive change steps: complete sliding, partial shear failure, and complete shear failure. The shape of fracture surface was quantified using a three-dimensional surface roughness measurement apparatus. The results showed that under the same slope angle of surface asperity and the normal stress condition, the fracture wavelength was constant, regardless of the wavelength. When the slope angle of surface asperity was the same in a partial shear failure case, the fracture wavelength increased proportionally with the normal stress. Under the same slope angle of surface asperity and the normal stress condition, the plane interface shear strength had a constant value in a partial shear failure case, regardless of the wavelength. When the slope angle of surface asperity was the same in a partial shear failure case, the shear strength increased proportionally with the normal stress.
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