Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
Bioinspir Biomim. 2022 Sep 22;17(6). doi: 10.1088/1748-3190/ac877b.
Inspired by the sliding behavior of gecko feet during climbing, the contribution of the shear effect to the self-cleaning performance of a bio-inspired micropillar-arrayed surface is studied through a load-shear-pull contact process. It is found that self-cleaning efficiency can be enhanced significantly by shear. The efficiency also depends on microparticle size. For the case of relatively large and small microparticles, self-cleaning efficiency increases first and then almost keeps a constant with the increase of shear distance at different preloads. For medium microparticles, shear can effectively improve self-cleaning efficiency only when the preload is small. The mechanical mechanism under such enhancement is mainly due to the varying contact states between microparticles and micropillars with the shear distance. When the shear distance is large enough, the final self-cleaning efficiency is not sensitive to shear distance anymore because the contact state reaches dynamic equilibrium. Based on such a self-cleaning mechanism of large microparticles, a simple and effective manipulator that can efficiently transfer solid particles is further proposed.
受壁虎脚部在攀爬过程中的滑动行为启发，通过负载-剪切-拉伸接触过程研究了剪切效应对仿壁虎微柱阵列表面自清洁性能的贡献。研究发现，剪切能显著提高自清洁效率。效率还取决于微粒子的大小。对于相对较大和较小的微粒子，在不同的预载下，随着剪切距离的增加，自清洁效率先增加然后几乎保持恒定。对于中等大小的微粒子，只有在预载较小时，剪切才能有效地提高自清洁效率。这种增强的机械机制主要是由于随着剪切距离的变化，微粒子和微柱之间的接触状态发生了变化。当剪切距离足够大时，由于接触状态达到动态平衡，最终的自清洁效率对剪切距离不再敏感。基于这种大微粒子的自清洁机制，进一步提出了一种简单有效的机械手，可有效转移固体颗粒。
