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Experiments reveal that structural transitions in thin sheets are mediated bythe passage of transient and stable mobile localized elastic excitations. These``crumples'' or ``d-cones'' nucleate, propagate, interact, annihilate, andescape. Much of the dynamics occurs on millisecond time scales. Nucleationsites correspond to regions where generators of the ideal unstretched surfaceconverge. Additional stable intermediate states illustrate two forms ofquasistatic inter-crumple interaction through ridges or valleys. Theseinteractions create pairs from which extended patterns may be constructed inlarger specimens. The onset of localized transient deformation with increasingsheet size is correlated with a characteristic stable crumple size, whosemeasured scaling with thickness is consistent with prior theory and experimentfor localized elastic features in thin sheets. We offer a new theoreticaljustification of this scaling.

Buckling mediated by mobile localized elastic excitations