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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Dynamic failure in amorphous solids via a cavitation instability.

Eran Bouchbinder¹, Ting-Shek Lo, Itamar Procaccia

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 21, 2008

Summary

Dynamic failure in amorphous materials requires understanding plasticity beyond elasticity. A new theory reveals fast cavitation modes linked to significant plastic deformation in these systems.

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Area of Science:

Materials Science
Solid Mechanics
Rheology

Background:

Dynamic failure in amorphous materials is poorly understood, especially the role of plasticity near moving boundaries.
Existing elasticity theories are insufficient to capture complex failure mechanisms involving plasticity.

Purpose of the Study:

To investigate dynamic failure in amorphous materials by incorporating plasticity into free boundary dynamics.
To analyze cavitation instability in radially symmetric stressed materials.

Main Methods:

Utilized the athermal shear transformation zone (aSTZ) theory to model free boundary dynamics.
Incorporated both elasticity and viscoplasticity into the theoretical framework.

Main Results:

The aSTZ theory predicts the existence of fast cavitation modes in amorphous systems.
These fast modes are accompanied by extensive plastic deformations.

Conclusions:

The study highlights the critical role of viscoplasticity in dynamic failure of amorphous materials.
The findings provide new insights into the physics of cavitation and plastic deformation during failure.