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crease

Gravity induced crease-to-wrinkle transition in soft materials

Submitted by Xudong Liang on
research
wrinkle
crease

Creasing and wrinkling instability are two distinct surface instability modes characterized by localized singular folds and continuous smooth undulations, respectively. In this article, we show that the surface of a soft elastomer may develop wrinkles or creases under compression and the action of gravitational force, depending on the magnitude of gravitational force.

Formation of creases on the surfaces of elastomers and gels

Submitted by Wei Hong on
research
suo group research
instability
gel
hong group research
crease

When a block of an elastomer is bent, the compressed surface may form a crease. This paper analyzes the critical condition for creasing by comparing the elastic energy in a creased body and that in a smooth body. This difference in energy is expressed by a scaling relation. Critical conditions for creasing are determined for elastomers subject to general loads and gels swelling under constraint. The theoretical results are compared with existing experimental observations.

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