Variation of frictional strength in precut foam rubber, with implications for slip instability
Date
1993Type
ThesisDepartment
Geological Sciences & Engineering
Degree Level
Master's Degree
Degree Name
Geological Engineering
Statistics
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Foam rubber is useful for modelling earthquakes and stick-slip, chattering that occurs readily in foam rubber and is controlled by friction weakening and stiffness. This study investigates frictional parameters and variable friction potentially causing stick-slip. The best friction coefficient for foam rubber is: friction over normal load to the two-thirds power. Increasing the system stiffness sufficiently enabled smooth sliding. In these experiments, contact time has no effect on static friction. However, peak friction increases during a second sliding interval from asperities interlocking. Friction also significantly increases inversely with load rate, with effects amplified by dynamic conditions. No negative friction-velocity relation is exhibited. Rather, the curve increases rapidly then remains constant over velocities corresponding to stick-slip events. Displacement weakening (demonstrated when asperities interlock) and load rate may cause stick-slip in foam rubber, but pot velocity or contact time.
Description
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Permanent link
http://hdl.handle.net/11714/1795Subject
foam rubberearthquakes
stick-slip
friction weakening
frictional parameters
variable friction
friction coefficient
smooth sliding
contact time
static friction
peak friction
second sliding interval
interlocking asperities
load rate
negative friction--velocity relation
stick-slip events
displacement weakening
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