Buckling Thresholds for Pre-Loaded Spherical Shells Subject to Localized Blasts

Sieber Jan; Hutchinson John W.; Thompson J. Michael T.

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Buckling Thresholds for Pre-Loaded Spherical Shells Subject to Localized Blasts

机译：Buckling Thresholds for Pre-Loaded Spherical Shells Subject to Localized Blasts

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This paper investigates the robustness against localized impacts of elastic spherical shells pre-loaded under uniform external pressure. We subjected a pre-loaded spherical shell that is clamped at its equator to axisymmetric blast-like impacts applied to its polar region. The resulting axisymmetric dynamic response is computed for increasing amplitudes of the blast. Both perfect shells and shells with axisymmetric geometric imperfections are analyzed. The impact energy threshold causing buckling is identified and compared with the energy barrier that exists between the buckled and unbuckled static equilibrium states of the energy landscape associated with the pre-loaded pressure. The extent to which the impact energy of the threshold blast exceeds the energy barrier depends on the details of its shape and width. Targeted blasts that approximately replicate the size and shape of the energy barrier buckling mode defined in the paper have an energy threshold that is only modestly larger than the energy barrier. An extensive study is carried out for more realistic Gaussian-shaped blasts revealing that the buckling threshold energy for these blasts is typically in the range of at least 10-40% above the energy barrier, depending on the pressure pre-load and the blast width. The energy discrepancy between the buckling threshold and energy barrier is due to elastic waves spreading outward from the impact and dissipation associated with the numerical integration scheme. Buckling is confined to the vicinity of the pole such that, if the shell is not shallow, the buckling thresholds are not strongly dependent on the location of the clamping boundary, as illustrated for a shell clamped halfway between the pole and the equator.

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《Journal of Applied Mechanics: Transactions of the ASME》 |2020年第3期|共10页
作者
Sieber Jan; Hutchinson John W.; Thompson J. Michael T.;
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作者单位

Univ Exeter, Dept Math, Exeter EX4 4QF, Devon, England;

Harvard Univ, SEAS, Cambridge, MA 02138 USA;

Univ Cambridge, DAMTP, Cambridge CB3 0WA, England;

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原文格式 PDF
正文语种英语
中图分类应用力学;
关键词
dynamic buckling; energy barrier; impact loading; spherical shells; computational mechanics; impact; structures; wave propagation;

Buckling Thresholds for Pre-Loaded Spherical Shells Subject to Localized Blasts

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