The Elastic Response of Buried Cylinders, Critical Literature Review and Pilot Study

摘要

Three series of tests were conducted on the cylinder under both static and dynamic loading conditions in the Small (4-foot-diameter) Blast Load Generator. The cylinder had a test section length of 12 inches, a diameter of 6 inches, a stiffness EI/R cubed of 164, and a diameter-to-thickness ratio d/t of 50. The surface overpressures ranged from 0 to 350 psi static and from 100 to 250 psi dynamic. The depth of cover over the crown ranged from 0 to 12 inches of soil. Measurements were made of strain in the cylindrical section, surface overpressure, and the associated free-field pressure. The dynamic strains were 20 to 40 percent higher than the strains at an equivalent static load. Load cycling had negligible effect on the elastic response of the cylinder. Thrust was generally a linear function of the applied surface overpressure; however, moment was highly nonlinear and tended to increase at a decreasing rate. The state of the art concerning dynamic, elastic theory for rings was summarized, including an analysis of the mathematical and physical limitations of the currently available theories.