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Mechanical Yield in Amorphous Solids: A First-Order Phase Transition.

Prabhat K Jaiswal1, Itamar Procaccia1, Corrado Rainone1

  • 1Department of Chemical Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters
|March 12, 2016
PubMed
Summary
This summary is machine-generated.

Amorphous solids undergo a phase transition at yield, not a change in material state. This transition shifts the system from limited configurations to a broader range, including unstable ones.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Rheology

Background:

  • Amorphous solids exhibit yielding at a critical strain, entering an elastoplastic steady state.
  • The microscopic differences between states before and after yielding remain a significant unresolved question in materials science.

Purpose of the Study:

  • To investigate the fundamental nature of the yielding transition in amorphous solids.
  • To propose a universal explanation for the microscopic state changes during yielding, independent of material specifics.

Main Methods:

  • Utilizing a strain-controlled experimental setup to observe material behavior.
  • Employing a universally applicable order parameter to quantify the transition.
  • Analyzing phase space configurations to understand pre- and post-yield states.

Main Results:

  • Demonstrating that yielding is a first-order phase transition.
  • Showing a shift from a restricted set of configurations to a vastly richer set, including marginally stable ones.
  • Validating the proposed order parameter for unambiguous quantification of the transition.

Conclusions:

  • The yielding of amorphous solids is a phase transition, not a change in the fundamental material state.
  • A universal order parameter can effectively characterize this transition across different amorphous materials.
  • The transition involves an expansion of accessible configurations in phase space.