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  3. Squeaking At Soft-rigid Frictional Interfaces.
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  3. Squeaking At Soft-rigid Frictional Interfaces.

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Squeaking at soft-rigid frictional interfaces.

Adel Djellouli1, Gabriele Albertini2, Jackson Wilt3

  • 1J.A. Paulson School of Engineering and Applied Sciences, Harvard University, Boston, MA, USA. adjellouli@g.harvard.edu.

Nature
|February 25, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Squeaking sounds from soft-rigid interfaces are caused by propagating slip pulses, not just stick-slip. Surface ridges can stabilize these pulses, creating consistent squeaking frequencies.

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Area of Science:

  • Tribology
  • Materials Science
  • Acoustics

Background:

  • Squeaking is common in daily life, often attributed to stick-slip friction.
  • Soft-rigid interfaces can detach via slip pulses, but mechanisms at squeaking velocities are unclear.

Purpose of the Study:

  • Investigate the mechanisms behind squeaking at soft-rigid interfaces during high-velocity sliding.
  • Determine the role of slip pulses and geometric confinement in generating squeaking sounds.

Main Methods:

  • Experimental investigation of soft-rigid interfaces at squeaking-inducing velocities.
  • High-speed imaging and acoustic analysis to observe pulse dynamics.
  • Comparison of flat interfaces with those featuring surface ridges.

Main Results:

  • Opening slip pulses propagate at the shear wave speed of the soft material, mediating slip.
  • Irregular pulses in flat samples produce broadband noise.
  • Surface ridges confine pulses, leading to regular frequencies matching the block's shear mode and consistent squeaking.

Conclusions:

  • Squeaking at soft-rigid interfaces is driven by structure-stabilized slip pulse propagation.
  • Geometric confinement transforms irregular dynamics into coherent pulse trains, explaining frequency generation.
  • Findings offer insights into frictional rupture in engineered and natural systems.