Lewis, B.B. Investigation of high strains at the bottom of the Los Alamos confinement vessel. United States: N. p., 1992.
Web. doi:10.2172/10183324.
Lewis, B.B. Investigation of high strains at the bottom of the Los Alamos confinement vessel. United States. doi:10.2172/10183324.
Lewis, B.B. Wed .
"Investigation of high strains at the bottom of the Los Alamos confinement vessel". United States.
doi:10.2172/10183324. https://www.osti.gov/servlets/purl/10183324.
@article{osti_10183324,
title = {Investigation of high strains at the bottom of the Los Alamos confinement vessel},
author = {Lewis, B.B.},
abstractNote = {In helping Los Alamos to understand the vessel response of explosive confinement vessels, APTEK has provided analysis of a 6 foot diameter vessel subjected to a spherical explosive blast. Correlations between analysis and test were very good except at the bottom of the vessel. A beating response was seen in the tests which reinforced the primary response mode at the bottom of the vessel, possibly to the extent of causing local yielding at the bottom. The authors did not predict the beating response and could not explain its origin. Since both APTEK and LANL felt that understanding these strains was important, they investigated the nature and possible origins of the response. They began a systematic study of the effects of various parameters of the problem. In separate analyses, they added boundary conditions, increased the mass of the ports by 10%, and included a row of 10% stiffer material to represent the weld. Of these, only the added boundary condition had a significant effect, and the boundary condition applied (vertical fixity at the bottom of two opposite ports to simulate the slings used) caused the strains at the bottom to decrease. They also made a less refined quarter-symmetric model with three elements through the thickness to perform a modal analysis. They found mode shapes similar in character to the deformed shapes obtained from the dynamic response. They theorized that the pressure reflections in the vessel were exciting one of these modes in the test but not in the analysis. They changed the timing of the pressure reflections to coincide with the suspected secondary response mode. For a 15% change in the timing of the pressure pulses, and with no change in the magnitude of the pressure, they obtained an increase in vessel strains at the bottom of over 40%.},
doi = {10.2172/10183324},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 30 00:00:00 EDT 1992},
month = {Wed Sep 30 00:00:00 EDT 1992}
}
