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THE RESPONSE OF BURIED CYLINDERS TO DYNAMIC LOADING.
Rept. for Jul 65-Dec 67,
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
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This report summarizes the results of an experimental investigation of the response of horizontally oriented buried flexible cylinders to dynamic loads. The objective of this study was to investigate the effect of variations in peak over pressure, depth of cover, and cylinder stiffness on cylinder response. All cylinders had a mean radius of 4 inches and a length of 16 inches. Cylinders of two different wall thicknesses were tested at depths of cover ranging from 0 to 8 inches and peak overpressures from 98 to 525 psi. These experiments showed that the surrounding soil does greatly increase the dynamic buckling strength of a thin-walled cylinder. It was also shown that a small change in the depth of cover could have a significant effect on buckling strength. Peak strains sometimes exceeded yield strength values, but they did not cause failure of the cylinder. Peak overpressure and depth of cover not only affected the magnitude of response to applied loads but also affected the location of the point of maximum strain. Peak strains and deflections at the crown and invert were more sensitive to changes in peak overpressure and depth of cover than were the strains and deflections at the springlines. Author
APPROVED FOR PUBLIC RELEASE