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arXiv 1303.2180cond-mat.soft
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褶皱薄板中脊-脊相互作用的影响

Effect of Ridge-Ridge Interactions in Crumpled Thin Sheets

Shiuan-Fan Liou, Chun-Chao Lo, Ming-Han Chou, Pai-Yi Hsiao, Tzay-Ming Hong

摘要:

我们研究是否以及如何修订的单脊近似的基础上的能量标度在一个实际的褶皱片,即在存在的脊脊相互作用。分子动力学模拟用于此目的。为了提高数据质量,对通用协议进行了修改。随着起皱的进行,我们发现,平均存储能量的变化从成比例的三分之一的脊长度的线性关系,而弯曲和拉伸能量的比例从5减少到2。以前的模拟和实验之间的差异的材料依赖性的幂律指数得到解决。我们进一步确定了平均脊长度与起皱球尺寸$R$、脊数$1/R^2$和每单位脊长度的平均存储能量$1/R^{2.364\sim 2.487}$成线性比例。这些结果与平均场的预测是一致的。最后,我们将现有的模拟扩展到高压区域的完整性,并验证了一个新的标度关系的存在,这是更普遍的比熟悉的幂律覆盖整个密度范围。

英文摘要:

We study whether and how the energy scalings based on the single-ridge approximation are revised in an actual crumpled sheet; namely, in the presence of ridge-ridge interactions. Molecular Dynamics Simulation is employed for this purpose. In order to improve the data quality, modifications are introduced to the common protocol. As crumpling proceeds, we find that the average storing energy changes from being proportional to one-third of the ridge length to a linear relation, while the ratio of bending and stretching energies decreases from 5 to 2. The discrepancy between previous simulations and experiments on the material-dependence for the power-law exponent is resolved. We further determine the averaged ridge length to scale linearly with the crumpled ball size $R$, the ridge number as $1/R^2$, and the average storing energy per unit ridge length as $1/R^{2.364\sim 2.487}$. These results are consistent with the mean-field predictions. Finally, we extend the existent simulations to the high-pressure region for completeness, and verify the existence of a new scaling relation that is more general than the familiar power law at covering the whole density range.

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