Confirming the continum theory of dynamic brittle fracture for fast cracks

Article Abstract:

Work on the dynamic states of fracture has provided information on processes in the immediate vicinity of a crack's tip, but a continuum description of the fracture process has yet to be described. Measurements of dynamic fracture in a brittle, amorphous material had quantitative agreement with the single-crack equation of motion theory. The micro-branching process can produce a single-crack state momentarily, which immediate attains predicted single-crack velocity.

Amorphous substances, Amorphous materials, Brittleness

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Physics in a jumping sandbox

Article Abstract:

The highly localized particle-like excitations of a granular layer oscillating at a half drive frequency are known as oscillons. They determine the structure of a nonlinear system by excitations. Oscillons are of two types, and either attract or repel each other to form dipoles, chains, or lattices. Highly localized systems called soliton are dissipative and do not show a change in their shape and speed on collision.

Analysis, Reports, Nonlinear theories, Granular materials, Solitons

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Singularity dynamics in curvature collapse and jet eruption on a fluid surface

Article Abstract:

A theoretical and experimental study of the generation of singularity by inertial focusing is reported. Inertial force leads to collapse of the surface leading to jet formation. It is predicted that the surface profiles may be describable by a single universal exponent, correlating closely with experimental measurements of a collapsing surface singularity.

Fluid mechanics

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