SCALING PROPERTIES OF STRETCHING RIDGES IN A CRUMPLED ELASTIC SHEET

Strong deformation of a sheet of solid material often leads to a crumpled state having sharp points of high curvature. A scaling property governing the crumpled state has been numerically demonstrated by an examination of the ridges joining pairs of sharp points in a range of simple geometries of variable size, As the linear size X increases sufficiently, the deformation energy grows as X(1/3) and consists of similar amounts of bending and stretching energy. The deformation energy becomes concentrated in a fraction of the sheet that decreases as X-(1/3). Despite this concentration, the local strain in the ridge decreases as X-(2/3). Nearly all the deformation energy in thin, crumpled elastic sheets was found to be concentrated in ridges that obey these scaling laws.