| Summary: | 碩士 === 淡江大學 === 土木工程學系 === 85 === Joint roughness has an essential influence on the
development, and as a consequence, the shear strength of joints.
To date, joint roughness has been considered as a dilation
parameter that effectively increases the friction angle above
the friction angle by some angle. Generally, the dilation term
is not constant, but gradually decreases due to asperity
destroyed with shear displacement increasing. To understand the
progressive failure process after peak strength is thus a
meaningful matter. In this paper, two types of artificial joints
with tooth-shaped asperity with either 15* or 30* inclination on
a joint profile is employed. Also, a multiple profile containing
the above two teeth is adopted to examine the interaction
between adjoining teeth. It concludes that (1) The successive
strength and dilation decreases gradually due to the destruction
of asperity as the displacement increasing. The degrading rate
of the strength parameters and wear area are primarily depended
on the normal stress and initial roughness. The rougher surface
demonstrates a more brittle failure. (2) The residual state is
reached about 10-20 times of the peak shear displacement and
still rougher. (3) The failure behavior of teeth in multiple
profiles occurs in turn according to the asperity orders. The
multiple shearing behavior may be superimposed by the two
components of asperities.
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