Position control of desiccation cracks by memory effect and Faraday waves
Position control of desiccation cracks by memory effect and Faraday waves
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DOI：
10.1140/epje/i2013-13001-8
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发表时间：
2013-01
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影响因子：
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通讯作者：
H. Nakayama;Y. Matsuo;Ooshida Takeshi;A. Nakahara
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文献类型：
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作者：
H. Nakayama;Y. Matsuo;Ooshida Takeshi;A. Nakahara
摘要实验研究了碳酸钙糊层干燥裂纹的模式形成。众所周知，这种浆料表现出记忆效应，这意味着对新鲜浆料进行短时间的水平振动，可以预先决定浆料干燥后形成的裂缝的方向。虽然裂缝的位置（与其方向相反）在水平振动的情况下仍然是随机的，但目前的工作报告称，它们的位置也是可控的，至少在某种程度上，通过对浆料施加垂直振动并印记法拉第波的图案，从而打破了系统的平移对称性。实验表明，裂缝往往出现在法拉第波的节点区，在条纹法拉第波的情况下，节点区裂缝的形成频率是反节点区裂缝的两倍，可能是由于局部水平运动的原因。由于这种对节点区的偏爱，法拉第波的方形晶格模式的记忆使得裂缝在与法拉第波的直观晶格方向相差45度的斜方向上运行。图形抽象
AbstractPattern formation of desiccation cracks on a layer of a calcium carbonate paste is studied experimentally. This paste is known to exhibit a memory effect, which means that a short-time application of horizontal vibration to the fresh paste predetermines the direction of the cracks that are formed after the paste is dried. While the position of the cracks (as opposed to their direction) is still stochastic in the case of horizontal vibration, the present work reports that their positioning is also controllable, at least to some extent, by applying vertical vibration to the paste and imprinting the pattern of Faraday waves, thus breaking the translational symmetry of the system. The experiments show that the cracks tend to appear in the node zones of the Faraday waves: in the case of stripe-patterned Faraday waves, the cracks are formed twice more frequently in the node zones than in the anti-node zones, presumably due to the localized horizontal motion. As a result of this preference of the cracks to the node zones, the memory of the square lattice pattern of Faraday waves makes the cracks run in the oblique direction differing by 45 degrees from the intuitive lattice direction of the Faraday waves.Graphical abstract