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Variation of frictional strength in precut foam rubber, with implications for slip instability
Date
1993Type
ThesisDepartment
Geological Sciences and Engineering
Degree Level
Master's Degree
Degree Name
Geological Engineering
Abstract
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
Mackay Science Project
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