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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Biologically inspired crack trapping for enhanced adhesion
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Biologically inspired crack trapping for enhanced adhesion

机译：受生物启发的裂纹捕获，可增强附着力

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摘要

We present a synthetic adaptation of the f ibrillar adhesion surfaces found in nature. The structure consists of protruding fibrils topped by a thin plate and shows an experimentally measured enhancement in adhesion energy of up to a factor of 9 over a flat control. Additionally, this structure solves the robustness problems of previous mimic structures and has preferred contact properties (i.e., a large surface area and a highly compliant structure). We show that this geometry enhances adhesion because of its ability to trap interfacial cracks in highly compliant contact regimes between successive fibril detachments. This results in the requirement that the externally supplied energy release rate for interfacial separation be greater than the intrinsic work of adhesion, in a manner analogous to lattice trapping of cracks in crystalline solids.
机译：我们提出自然界中发现的纤毛粘附表面的合成适应。该结构由突出的原纤维和一块薄板组成，与平版对照相比，该材料在实验上测得的粘附能提高了9倍。另外，该结构解决了先前模拟结构的坚固性问题，并具有优选的接触特性（即，大的表面积和高度柔顺的结构）。我们表明，这种几何形状提高了附着力，因为它能够在连续的原纤维分离之间的高度顺应的接触方式中捕获界面裂纹。这导致要求，用于界面分离的外部提供的能量释放速率必须大于粘附的固有功，其方式类似于结晶固体中裂纹的晶格捕获。

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