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|Loading rate effects on compressibility of sand
|United States. Defense Nuclear Agency.
Jackson, J. G. (John Guy)
Ehrgott, John Q., Jr. (John Qua), 1970-
Uniaxial strain tests
|Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-79-24.
Abstract: Stress-strain curves from 61 uniaxial strain tests are presented which depict the response of three dry sands to intense transient pressures; the loadings ranged from 10 MPa to 80 MPa and were applied with rise times ranging from a few tenths of a millisecond to a few minutes. Equipment and techniques used to conduct the tests and to assess the effect of wave propagation on the measurements are described. The data show that the resistance of dry sands to compression increases dramatically when loading rise times are less than 1 msec, and that the character of the stress-strain relation shifts rapidly from a "stiffening" response (curvature concave to stress axis) to a "yielding" response (curvature concave to strain axis). The stress-strain response of a relatively simple rate-dependent rheologic model is shown to be in good agreement, both qualitatively and quantitatively, with the measured results.
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