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Propagating Schallamach-type waves resemble interface cracks.

Mohammad Aaquib Ansari1, Koushik Viswanathan1

  • 1Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India.

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Summary
This summary is machine-generated.

Stick-slip friction in polymers is caused by detachment waves. These waves, analogous to interface cracks, create a phase diagram predicting stick-slip versus steady sliding in soft materials.

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Area of Science:

  • Friction and Tribology
  • Soft Matter Physics
  • Adhesion Science

Background:

  • Stick-slip is a common friction instability in elastic solids, particularly in adhesive polymer contacts.
  • It arises from the interplay between elasticity and interface adhesion, driven by detachment waves.
  • Understanding these waves is crucial for controlling friction in soft materials.

Purpose of the Study:

  • To analyze the behavior of two distinct detachment waves (Schallamach and separation waves) in adhesive polymer contacts.
  • To compare detachment waves to bimaterial interface cracks using elastodynamic frameworks.
  • To develop a predictive phase diagram for stick-slip phenomena.

Main Methods:

  • Utilized a perturbative elastodynamic framework to model detachment wave propagation.
  • Employed a numerical scheme to calculate interface stresses and velocities.
  • Derived closed-form solutions for incompressible solids.
  • Established an analogy between detachment waves and bimaterial interface cracks.

Main Results:

  • Identified two types of detachment waves (Schallamach and separation) causing slip.
  • Demonstrated that these waves travel at speeds much lower than elastic waves.
  • Revealed a strong correspondence between detachment waves and interface cracks, including stress singularities.
  • Developed a phase diagram illustrating conditions for stick-slip versus steady sliding.

Conclusions:

  • Detachment waves in polymers exhibit behaviors analogous to interface cracks.
  • The developed phase diagram provides insights into the occurrence of stick-slip in soft interfaces.
  • Findings have significant implications for understanding and manipulating friction in soft materials.