Experiments are done on elastic plates set unilaterally on foundations or substrates
and driven into large deflections by a centrally located load. Previous and related
work that report wrinkling in such problems, especially in thin layers on
substrates, is reviewed. Deflection contours and tabulated data are given
for one wrinkled state. Photographs of others illustrate wrinkling in plates
of various geometry. It is found that for certain plate-foundation relative
stiffnesses, a characteristic, periodic wrinkling shape evolves, but on the brink of
instability that presents a challenge for both analytical solution and numerical
simulation.
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