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Uncovering avalanche sources via acceleration measurements
Emil Bronstein1, Eilon Faran2, Ronen Talmon3
1Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel. emilbr@campus.technion.ac.il.
Nature Communications
|August 29, 2024
Summary
Researchers developed a new acceleration measurement method to study avalanche sources in materials. This technique reveals unique avalanche source properties, distinct from acoustic emission signals, offering insights into deformation processes.
Area of Science:
- Materials Science
- Solid Mechanics
- Physics of Deformable Bodies
Background:
- Avalanche sources are rapid, local events crucial for material deformation.
- Acoustic emission (AE) signals are modified by transfer functions, obscuring source characteristics.
- Understanding avalanche source physics is challenging due to signal distortion.
Purpose of the Study:
- To develop a novel experimental method to isolate and characterize avalanche sources.
- To investigate the physical properties of avalanche sources in magnesium deformation twinning.
- To differentiate between intrinsic avalanche source behavior and transfer function effects.
Main Methods:
- Utilized acceleration measurements to eliminate acoustic transfer function effects.
- Applied the method to study deformation twinning in magnesium.
- Analyzed amplitude, characteristic times, and a new feature of avalanche sources.
Main Results:
- Avalanche source amplitudes and times lack a clear physical law, unlike AE signals.
- AE signal amplitudes and durations follow a power law due to the transfer function.
- Identified a new avalanche source feature linked to twinned volume growth rate.
- Observed a power-law distribution for this new feature, suggesting dynamic criticality.
- Determined an intrinsic upper bound for avalanche source characteristic times.
Conclusions:
- The novel acceleration measurement method successfully isolates avalanche source properties.
- Distinguishes intrinsic avalanche source behavior from artifactual AE signal relationships.
- Reveals unpredicted dynamic criticality and a physical limit in magnesium twinning processes.
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