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Rheological aging and rejuvenation in solid friction contacts
L Bureau1, T Baumberger, C Caroli
1Groupe de Physique des Solides (UMR 7588), Universités Paris 6 & 7, 2 place Jussieu, 75251 Paris Cedex 05, France. bureau@gps.jussieu.fr
The European Physical Journal. E, Soft Matter
|March 11, 2004
Summary
Soft glassy polymer interfaces strengthen when resting and weaken when sliding, revealing adhesive joint rheology. Aging accelerates under stress below the static threshold.
Area of Science:
- Rheology
- Soft Matter Physics
- Tribology
Background:
- Understanding the frictional properties of interfaces is crucial in various scientific and engineering fields.
- Soft glassy materials exhibit complex behaviors influenced by aging and sliding.
- Confined quasi-2D soft glasses present unique rheological characteristics.
Purpose of the Study:
- To investigate the low-velocity frictional properties of interfaces between rough glassy polymers and smooth silanized glass.
- To explore the rheology of adhesive joints where shear localizes.
- To characterize the aging and rejuvenation phenomena in confined quasi-2D soft glasses.
Main Methods:
- Studying frictional properties at low velocities (0.1-100 microm s(-1)).
- Analyzing interfaces between a rough glassy polymer and smooth silanized glass.
- Observing the behavior of adhesive joints under different conditions (rest, sliding, stress).
Main Results:
- Adhesive joints exhibit logarithmic strengthening during aging at rest.
- Sliding causes weakening (rejuvenation) of the joints, saturating at higher velocities.
- Aging at rest is accelerated when subjected to finite stress below the static threshold.
Conclusions:
- Confined quasi-2D soft glasses display characteristic aging and rejuvenation phenomena.
- The rheology of adhesive joints is directly accessible through this experimental setup.
- Stress significantly influences the aging process even below the static friction threshold.