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Velocity-strengthening friction significantly affects interfacial dynamics, strength and dissipation
Yohai Bar-Sinai1, Robert Spatschek2, Efim A Brener3
1Chemical Physics Department, Weizmann Institute of Science, Rehovot 76100, Israel.
Scientific Reports
|January 20, 2015
Summary
Velocity-strengthening friction significantly impacts frictional instabilities by altering energy release and dissipation. Stronger strengthening promotes slower rupture, affecting event dynamics and implications for understanding frictional systems.
Area of Science:
- Physics
- Geophysics
- Materials Science
Background:
- Frictional interface dynamics are not well-understood.
- Velocity-strengthening friction is a common feature of interfaces, linked to slow stick-slip motion.
Purpose of the Study:
- To theoretically investigate the importance of velocity-strengthening friction.
- To analyze its effect on frictional instability dynamics.
Main Methods:
- Studied three variants of a realistic friction model with varying high-velocity behaviors.
- Quantified energy partition (dissipation and radiation).
- Analyzed interfacial rupture front selection and arrest.
Main Results:
- Velocity-strengthening friction significantly affects global interfacial resistance and energy release during instabilities.
- Different strengthening forms can lead to similar event magnitudes but different dissipation/radiation rates.
- Stronger velocity-strengthening friction promotes slower rupture propagation.
Conclusions:
- The presence and form of velocity-strengthening friction critically influence frictional instability characteristics.
- Rupture front velocity is a key mediator, with stronger strengthening leading to slower ruptures.
- These findings have significant implications for understanding frictional dynamics in natural and engineered systems.
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