Universal bounds for overall properties of linear and nonlinear heterogeneous solids

Article Abstract:

A study predicts universal bounds for the elastic parameters of linear and nonlinear heterogeneous solids with arbitrary microstructures undergoing a common average stress/strain. Generalization of the results gives the overall strain and stress fields for any set of consistent boundary conditions. Bounds for two elastic parameters are independent of the size, shape, and distribution of inhomogeneity phases, and remain same for ellipsoidal and parallelepipedic specimens, validating the universality of the bounds.

Numerical analysis, Materials, Dynamic testing (Materials), Strains and stresses, Stresses (Materials), Boundary value problems, Microstructure, Microstructures

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Micromechanics modeling of electronic composites

Article Abstract:

Eshelby's micromechanics modeling based on the effective medium theory is extendable to the thermal, physical and coupling characteristics of electronic composites. The model provides accurate predictions in the absence of matrix overlapping. A fiber percolation model is essential when the fillers embedded in the matrix of the composites are overlapped and have large property differences.

Models, Electromagnetic fields, Composite materials, Micromechanics, Micromechanics (Engineering)

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High strain-rate, small strain response of a NiTi shape-memory alloy

Article Abstract:

The compressive response of a NiTi shape-memory alloy is investigated at various strain rates using UCSD's modified 1/2-in. The NiTi shape-memory shows a superelastic response for small strains at all considered strain rate, and at room temperature, 296 K.

Analysis, Stress-strain curves, Thermal properties, Mechanical properties, Nickel alloys

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