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    Variation of frictional strength in precut foam rubber, with implications for slip instability

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    Author
    Slater, Catherine F
    Advisor
    Watters, Robert
    Date
    1993
    Type
    Thesis
    Department
    Geological Sciences & Engineering
    Degree Level
    Master's Degree
    Degree Name
    Geological Engineering
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    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
    Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives and Public Records through the Library Services and Technology Act (LSTA). To obtain a high quality image or document please contact the DeLaMare Library at https://unr.libanswers.com/ or call: 775-784-6945.
    Permanent link
    http://hdl.handle.net/11714/1795
    Subject
    foam rubber
    earthquakes
    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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