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|Title:||Response of horizontally oriented buried cylinders to static and dynamic loading|
|Authors:||United States. Army. Defense Atomic Support Agency.|
Dorris, Albert F.
|Keywords:||Cylinders plastic properties|
Strains and stresses
|Publisher:||U.S. Army Engineer Waterways Experiment Station|
Engineer Research and Development Center (U.S.)
Abstract: This was an experimental investigation into the response of small, shallow-buried (in dense, dry sand and stiff clay), aluminum cylinders to static (15-min rise time), rapid (13 msec), and dynamic (0.3 msec) plane-wave loading up to 500 psi. The cylinders had identical outside diameters of 3.5 in. and two thicknesses, 0.022 and 0.065 in. Hence, the cylinder stiffnesses, EI/R3 , were 1.7 and 45 (d/t = 159 and 54), respectively. In stiff clay, the overpressure required to cause collapse increased very slowly with increasing depth of burial from zero to the deepest burial, three-quarters of the diameter. The hydrostatic buckling equation, P cr = 3 EI/R3, was applicable for the cylinders tested. In the dense sand, the overpressure required to cause collapse increased greatly with increasing depth of burial from zero to one-eighth of the diameter. Below this depth it was not possible to collapse even the most flexible cylinders under the available 500-psi pressure. The hoop compression theory was verified. A ductility factor of about 7 was found to be conservative for cylinders buried at depths greater than one-eighth their diameter in the dense sand. The recorded strains were nonelastic in many cases and it was shown that large yielding does not necessarily define collapse. Stress and moment were found to be nonlinear functions of overpressure, whereas thrust was generally found to be a linear function of overpressure. The differences between static and rapid loading in the elastic response of the cylinder were found to be small. Diameter changes recorded prior to collapse for the static tests were small, less than 5 percent of the diameter.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|
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|WES-Technical-Report-No.1-682.pdf||7.81 MB||Adobe PDF|