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Disordered materials remember past stresses. Researchers found that energy dissipation indicates the largest past perturbation, enabling new ways to read material memory using global measurements.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Soft Matter Physics

Background:

  • Disordered and amorphous materials possess memory of past perturbations.
  • Understanding this memory is key to characterizing these complex systems.
  • Measuring local structural changes is typically required to study memory effects.

Purpose of the Study:

  • To identify a generic macroscopic indicator for the memory of the largest perturbation in amorphous materials.
  • To develop novel protocols for reading material memory using only global observables.

Main Methods:

  • Experimental investigation of crumpled sheets subjected to cyclic driving.
  • Analysis of energy dissipation as a response to applied perturbations.
  • Testing the developed memory readout protocols on a 3D amorphous solid.

Main Results:

  • Dissipation was identified as a generic macroscopic indicator of the largest perturbation memory.
  • A transient increase in dissipation was observed when exceeding the largest past perturbation, linked to unique irreversible structural changes.
  • Novel memory readout protocols based solely on global observables were successfully devised.

Conclusions:

  • Energy dissipation serves as a universal macroscopic signal for the history of largest perturbations in amorphous systems.
  • The developed methods allow for non-invasive memory readout, applicable to various disordered materials.
  • This work provides a new perspective on memory phenomena in amorphous solids.