Nonaxisymmetric deflections were measured on clamped shallow spherical shells loaded over a small circular area concentric with the apex. The first nonaxisymmetric pattern contained three lobes. Additional load produced a maximum of five lobes and further loading showed a tendency to reverse the pattern sequence. Each configuration occurred within a relatively small range of corresponding values of normalized deflection δ and dimensionless load P*.
Nonaxisymmetric Behavior of Shallow Shells Loaded at the Apex
F. A. Penning
The Martin Company, Denver, Colo.
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Penning, F. A. (September 1, 1966). "Nonaxisymmetric Behavior of Shallow Shells Loaded at the Apex." ASME. J. Appl. Mech. September 1966; 33(3): 699–700. https://doi.org/10.1115/1.3625152
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