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Rupture Parameters of Soil Aggregates¹

ABSTRACT

Rupture stress values of air-dry aggregates of various sizes taken from nine surface soils containing from 7 to 53% clay are given as load in dynes per unit area. Corresponding rupture strain values are given as change in polar diameter at rupture per unit length of polar diameter. The rupture modulus defined as the stress/strain ratio is also listed. The values depend on the assumption that aggregates approximate spheres. Earlier work and visual observation show that this assumption is valid for 2- to 8-mm aggregates. Experimental stress-strain curves indicate that Hooke's law is valid up to rupture. Values of rupture stress, rupture strain and rupture modulus were found to be significantly correlated with percent clay, percent organic carbon, aggregate bulk density, aggregate size distribution and soil erodibility.

¹ Journal Paper no. J-5776 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Project no. 1064 and no. 1235 supported in part by Hatch Regional Research Funds, Project NC 57; Joint contribution with the Oak Ridge National Laboratory, Oak Ridge Tennessee (U.S. Atomic Energy Commission under contract with the Union Carbide Corporation), and with the Corn Belt Branch of the Soil and Water Conservation Research Division, ARS, USDA. Presented in part before Div. S-6, Soil Science Society of America, at Columbus, Ohio, Nov. 2, 1965.

² Health Physicist, Oak Ridge National Laboratory, Oak Ridge, Tenn., formerly Research Associate, Department of Agronomy, Iowa State Univ., Ames; Research Soil Scientist, USDA, and Associate Professor of Agronomy; and Professor of Agronomy and Physics, Iowa State University, Ames, Iowa, respectively.

Received for publication February 2, 1968. Accepted for publication April 22, 1968.