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Universal slow dynamics in granular solids

TenCate1, Smith, Guyer

  • 1Los Alamos National Laboratory, Earth and Environmental Sciences Division, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary
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A new type of material creep recovery was discovered in rocks and concrete. This behavior, observed after stress or temperature changes, follows a logarithmic time scale, indicating a unified internal strain origin.

Area of Science:

  • Materials Science
  • Geophysics
  • Solid Mechanics

Background:

  • Creep is a time-dependent deformation of materials under stress.
  • Elastic modulus drops can be induced by nonlinear acoustic straining or rapid temperature changes.
  • Understanding recovery behavior is crucial for material durability.

Purpose of the Study:

  • To investigate a novel creep recovery phenomenon in diverse geological materials.
  • To characterize the relationship between creep recovery and time.
  • To explore the underlying mechanisms of acoustically and thermally induced creep.

Main Methods:

  • Experimental testing of sandstone, limestone, and concrete samples.
  • Inducing elastic modulus drops via nonlinear acoustic straining and rapid temperature changes.

Related Experiment Videos

  • Monitoring modulus recovery over time scales exceeding 10^3 seconds.

    • Main Results:

    • A universal creep recovery behavior was observed across all tested materials.
    • Modulus recovery was found to be logarithmically proportional to the time after source discontinuation.
    • A scaling regime for recovery was established, covering at least 10^3 seconds.
    • Acoustically and thermally induced creep exhibited similar recovery patterns.

    Conclusions:

    • A single, internal strain-based mechanism likely governs both acoustically and thermally induced creep recovery.
    • This internal strain mechanism breaks the symmetry of the initial inducing source.
    • The findings offer new insights into the long-term mechanical behavior of porous materials.