Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...17...22s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 17, Issue 1, p. 22-30.
Physics
Scientific paper
Packings of spheres with filled interstices made of materials which contrast in compressibility and other physical properties are instructive as models of two-phase materials which are composed of two contiguous phases. The compliance of packings of this kind under pressure is controlled by contact formation with varying surface area and varying inhomogeneous contact stresses. Localised deviatoric stresses can produce plastic deformation, flow and fracture. Electric and thermal currents passing through a packing experience a ``spreading'' (or ``constriction'') resistance due to the spreading of the flux lines on either side of the contact areas. Electrical resistance measurements can thus be used as an indication of size and type of contact. Moreover, preferred Joule heating in the contact areas raises the temperature at the contact and thus generates heat flux away from the contact areas.
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