Electrical conductivity of porous binary powder mixtures

MA Cooper and WW Erikson and MS Oliver, MECHANICS OF MATERIALS, 162, 104026 (2021).

DOI: 10.1016/j.mechmat.2021.104026

Simultaneous data of the quasi-static compaction and electrical conductivity of porous, binary powder mixtures have been collected as a function of bulk density. The powder mixtures consist of a metal conductor, either titanium or iron, an insulator, and pores filled with ambient air. The data show a dependency of the conductivity in terms of relative bulk density and metal volume fraction on conductor type and conductor particle characteristics of size and shape. Finite element models using particle domains generated by discrete element method are used to simulate the bulk conductivity near its threshold while the general effective media equation is used to model the conductivity across the compression regime.

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