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Tensile Strength of Clay Films: A Measuring Technique¹

ABSTRACT

A technique is presented for quantitatively measuring tensile strength and axial tensile strain of clay films over a relative water vapor pressure range (P/P₀) from 0.02 to 0.92. The tensile strain energy is calculated from these data. With this technique, relative electrostatic and chemical interactions of different clay systems can be assessed with a minimum interference from frictional force components. Data for Mg-mont-morillonite showed a maximum tensile strength of 210 kg cm^-2 at P/P₀ = 0.02, exhibited an axial strain of 173µ cm^-1 and required 0.22 joules cm^-3 of tensile strain energy to rupture.

¹ Contribution from the Corn Belt Branch, Soil & Water Conservation Research Div., ARS, USDA, in cooperation with the Minnesota Agr. Exp. Sta., St. Paul, Minn.

² Research Soil Scientist, USDA, and Assistant Professor, Univ. of Minn.; Research Soil Scientist, USDA, and Professor, Univ. of Minn., respectively.

Received for publication April 27, 1970. Accepted for publication July 6, 1970.