DiDonna B A, Witten T A, Venkataramani S C, Kramer E M
Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Jan;65(1 Pt 2):016603. doi: 10.1103/PhysRevE.65.016603. Epub 2001 Dec 17.
The crumpling of a thin sheet can be understood as the condensation of elastic energy into a network of ridges that meet in vertices. Elastic energy condensation should occur in response to compressive strain in elastic objects of any dimension greater than 1. We study elastic energy condensation numerically in two-dimensional elastic sheets embedded in spatial dimensions three or four and three-dimensional elastic sheets embedded in spatial dimensions four and higher. We represent a sheet as a lattice of nodes with an appropriate energy functional to impart stretching and bending rigidity. Minimum energy configurations are found for several different sets of boundary conditions. We observe two distinct behaviors of local energy density falloff away from singular points, which we identify as cone scaling or ridge scaling. Using this analysis, we demonstrate that there are marked differences in the forms of energy condensation depending on the embedding dimension.
薄板材的褶皱可理解为弹性能量凝聚成在顶点处相交的脊状网络。弹性能量凝聚应发生在任何大于一维的弹性物体因压缩应变的情况下。我们对嵌入三维或四维空间的二维弹性薄板以及嵌入四维及更高维空间的三维弹性薄板中的弹性能量凝聚进行了数值研究。我们将薄板表示为具有适当能量泛函的节点晶格,以赋予拉伸和弯曲刚度。针对几种不同的边界条件集找到了最小能量构型。我们观察到远离奇点的局部能量密度衰减的两种不同行为,我们将其识别为圆锥缩放或脊缩放。通过这种分析,我们证明了根据嵌入维度,能量凝聚的形式存在显著差异。