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Area of Science:

  • Materials Science
  • Physics
  • Acoustics

Background:

  • Ultrathin crumpled sheets exhibit complex mechanical behaviors, including slow relaxation and memory retention.
  • Understanding the micromechanical origins of these phenomena is crucial for material design and application.

Purpose of the Study:

  • To investigate the statistical properties of acoustic noise emitted by ultrathin crumpled sheets during mechanical loading.
  • To elucidate the underlying micromechanical events responsible for logarithmic relaxation and memory effects.

Main Methods:

  • Experimental measurement of acoustic noise emitted by crumpled sheets under load.
  • Statistical analysis of the noise signal, focusing on event distribution and temporal characteristics.
  • Application of log-Poisson distribution to characterize the observed micromechanical events.

Main Results:

  • Logarithmic relaxation is characterized by a series of discrete, audible micromechanical events.
  • The statistics of these events follow a log-Poisson distribution.
  • This distribution provides a framework for understanding the slow relaxation and memory retention in these materials.

Conclusions:

  • The findings constrain potential mechanisms governing the glasslike slow relaxation in crumpled sheets.
  • The log-Poisson distribution offers a new perspective on the statistical nature of failure events in disordered materials.
  • This study links acoustic emission to fundamental micromechanical processes in disordered systems.