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Physicists find clues to the origin and evolution of wrinkles in thin sheets

Date:
July 15, 2010
Source:
American Physical Society
Summary:
New experiments offer insights into how defects influence the formation of wrinkles, and could prove helpful in understanding wrinkles in biological tissue.

This thin plastic sheet is floating on liquid wrinkles under stress. Physicists hope experiments such as these will help develop new models to explain how other materials wrinkle.
Credit: Jiangshui Huang, Benny Davidovitch, Christian D. Santangelo, Thomas P. Russell, and Narayanan Menon, University of Massachusetts, Amherst

As a sign of aging or in a suit, wrinkles are almost never welcome, but two papers in the current issue of Physical Review Letters offer some perspective on what determines their size and shape in soft materials.

Jiangshui Huang and colleagues at the University of Massachusetts, Amherst explore how wrinkles in a sheet adapt to an edge that prefers to be flat. They float a thin, rectangular film of common plastic (polystyrene) on water and compress the sheet along one direction to make folds. In the middle of the film, competition between gravity (which prefers shallow, frequent ripples) and the energy cost of bending the film (which favors longer, higher folds) determine the height and frequency of the folds. Near the edge, however, surface tension forces the film to lie flat. Huang et al. show the film interpolates between these two limits by smoothly tapering from larger, undulating folds in the center to higher frequency ripples at the edge.

In a related paper, Douglas Holmes and Alfred Crosby, also at the University of Massachusetts, Amherst quantify the transition from soft wrinkles to sharper folds. Similar to lifting a tissue from a box, they pull up an elastic sheet floating in water, and image the sheet as first wrinkles, and then folds, appear. They show that folds, like the edges of a neatly made bed, strain the sheet and smooth out the wrinkles.

The experiments offer complimentary insights into how defects, such as an edge or a fold, influence the presence of wrinkles and could prove helpful in understanding the formation of wrinkles in biological tissue.


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The above story is based on materials provided by American Physical Society. Note: Materials may be edited for content and length.


Cite This Page:

American Physical Society. "Physicists find clues to the origin and evolution of wrinkles in thin sheets." ScienceDaily. ScienceDaily, 15 July 2010. <www.sciencedaily.com/releases/2010/07/100715111426.htm>.
American Physical Society. (2010, July 15). Physicists find clues to the origin and evolution of wrinkles in thin sheets. ScienceDaily. Retrieved August 30, 2014 from www.sciencedaily.com/releases/2010/07/100715111426.htm
American Physical Society. "Physicists find clues to the origin and evolution of wrinkles in thin sheets." ScienceDaily. www.sciencedaily.com/releases/2010/07/100715111426.htm (accessed August 30, 2014).

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