Plasticity and avalanche behavior in microfracturing phenomena

Article Abstract:

A hypothetical scalar model was created to observe the dynamics of the microfracture phenomena observed in actual experiments on non-homogeneous materials such as plaster or concrete. The model is used in relation to a simulated, scale-free hierarchy of avalanche events that exhibits self-organized criticality. Results indicate that the critical steady state observed in the hypothetical model exhibits the plastic macroscopic actions readily seen in real materials.

Materials, Strains and stresses, Stresses (Materials), Strength of materials, Strength (Materials), Fracture mechanics, Creep (Materials)

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Dislocation multi-junctions and strain hardening

Article Abstract:

The interactions among three dislocations result in the formation of unusual elements of dislocation network topology, termed 'multi-junctions'. The existence of multi-junctions is predicted using dislocation dynamics and atomistic simulations and then their existence is confirmed by transmission electron microscopy experiments in single-crystal molybdenum.

Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Molybdenum, Observations, Spectra, Transmission electron microscopes, Properties, Structure

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Intermittent dislocation flow in viscoplastic deformation

Article Abstract:

Research is presented describing the interacting dislocations involved in the viscoplastic deformation of crystalline materials under stress, and how the dislocations move in a scale-free intermitten manner. The results are have been confirmed by a model that simulates interacting dislocations and successfully reproduces the main findings of the research.

Plasticity, Surfaces, Deformation of, Surface deformation, Crystals

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