arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.02153math.APcond-mat.soft
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弹性薄壳的曲率驱动弯曲

Curvature-driven wrinkling of thin elastic shells

Ian Tobasco

摘要:

把一个弹性薄壳压扁需要多少能量?受最近浮壳结构振动模式实验的启发,我们通过$Γ$ -收敛发展了一种严格的方法,用于回答这个问题,以壳的厚度和其他小参数的领先顺序。所观察到的图案涉及“有序”区域的明确定义的皱纹旁边的“无序”区域,其局部特征不太稳健;由于很少或没有张力施加,对顺序的偏好不是先验清楚的。通过一个典型模式的能量重新标度,我们得到了壳的有效位移的一个极限变分问题。它要求,以线性化的方式,覆盖一个最大的面积与长度缩短地图的平面。凸分析产生了一个边值问题,通过其缺陷措施的特征伴随模式。部分唯一性和正则性定理是由壳的有序部分的特征线方法得出的。用这种方法,我们可以从最小能量原理导出冲压弹性壳的首阶特征。

英文摘要:

How much energy does it take to stamp a thin elastic shell flat? Motivated by recent experiments on the wrinkling patterns of floating shells, we develop a rigorous method via $Γ$-convergence for answering this question to leading order in the shell's thickness and other small parameters. The observed patterns involve "ordered" regions of well-defined wrinkles alongside "disordered" regions whose local features are less robust; as little to no tension is applied, the preference for order is not a priori clear. Rescaling by the energy of a typical pattern, we derive a limiting variational problem for the effective displacement of the shell. It asks, in a linearized way, to cover up a maximum area with a length-shortening map to the plane. Convex analysis yields a boundary value problem characterizing the accompanying patterns via their defect measures. Partial uniqueness and regularity theorems follow from the method of characteristics on the ordered part of the shell. In this way, we can deduce from the principle of minimum energy the leading order features of stamped elastic shells.

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