The interplay of crack hopping, delamination and interface failure in drying nanoparticle films.
The interplay of crack hopping, delamination and interface failure in drying nanoparticle films.
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DOI：
10.1038/srep32296
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发表时间：
2016-08-25
影响因子：
4.6
通讯作者：
Smith MI
中科院分区：
文献类型：
--
作者：
Yang B;Sharp JS;Smith MI
通过纳米颗粒悬浮液的干燥形成的膜通过各种不同的机制释放应变的积累，包括剪切带、裂纹形成和分层。在这里，我们表明，这些不同的现象之间存在着重要的连接：脱层取决于裂纹跳跃的动力学，这反过来又是由剪切带的存在的影响。我们还表明，分层不均匀地发生在整个膜。当裂纹跳跃时，它们局部地引发膜的分层，其以比与裂纹跳跃相关联的时间尺度长得多的时间尺度翘曲。剥离前的一个小区域的运动，其中界面裂纹扩展的剪切分量被认为是增强的，导致在支撑衬底上的复杂的锯齿形图案的沉积。
Films formed through the drying of nanoparticle suspensions release the build-up of strain through a variety of different mechanisms including shear banding, crack formation and delamination. Here we show that important connections exist between these different phenomena: delamination depends on the dynamics of crack hopping, which in turn is influenced by the presence of shear bands. We also show that delamination does not occur uniformly across the film. As cracks hop they locally initiate the delamination of the film which warps with a timescale much longer than that associated with the hopping of cracks. The motion of a small region of the delamination front, where the shear component of interfacial crack propagation is believed to be enhanced, results in the deposition of a complex zig-zag pattern on the supporting substrate.