Suction effects in cratered surfaces
Suction effects in cratered surfaces
复制标题
凹坑表面的吸力效应
DOI：
10.1098/rsif.2017.0377
复制
发表时间：
2017
影响因子：
3.9
通讯作者：
Lu, Nanshu
中科院分区：
文献类型：
--
作者：
Qiao, Shutao;Wang, Liu;Jeong, Hyoyoung;Rodin, Gregory J.;Lu, Nanshu
实验表明，有坑表面可能比平坦表面具有更好的粘附性能。然而，由火山口产生的吸力效应，这可能是主要负责改善粘附力，还没有得到适当的模拟。本文结合实验，数值模拟和分析方法，对开发一个框架，量化孤立的陨石坑和陨石坑表面产生的吸力效应。建模方法强调大弹性变形的重要作用，而忽略了气流动力学，微观机制，如表面张力和空气渗透，以及速率依赖性。使用孤立的半球形陨石坑的实验数据验证了这种方法。建模方法被进一步应用到球冠（不一定是半球形）陨石坑的目标，确定最佳的几何和材料特性，以及最小的预载所需的最大吸力。已确定，具有深凹坑的刚性聚合物能够产生大的吸力。对于生物医学应用的核心软材料，可以通过用薄的刚性层加强深凹坑来获得大的吸力。加固陨石坑的参数优化研究表明，其中一些表现超出了共同的期望。然而，这些高性能的强化弹坑容易出现表面不稳定性，因此，这种弹坑的实际使用可能是有问题的。
It has been shown experimentally that cratered surfaces may have better adhesion properties than flat ones. However, the suction effect produced by the craters, which may be chiefly responsible for the improved adhesion, has not been properly modelled. This paper combines experimental, numerical simulation and analytical approaches towards developing a framework for quantifying the suction effect produced by isolated craters and cratered surfaces. The modelling approach emphasizes the essential role of large elastic deformation, while the airflow dynamics, microscopic mechanisms, like surface tension and air permeation, and rate-dependence are neglected. This approach is validated using experimental data for isolated hemi-spherical craters. The modelling approach is further applied to spherical cap (not necessarily hemi-spherical) craters with the objective of identifying optimal geometric and material properties, as well as the minimum preload necessary for attaining the maximum suction force. It is determined that stiff polymers with deep craters are capable of producing large suction forces. For soft materials, central to biomedical applications, large suction forces can be attained by reinforcing deep craters with thin stiff layers. Parametric optimization studies of reinforced craters reveal that some of them perform beyond common expectations. However, those high-performance reinforced craters are prone to surface instabilities, and therefore the practical use of such craters may be problematic.
影响因子：
4.7
作者：
Wang, Liu;Qiao, Shutao;Lu, Nanshu
通讯作者：
Lu, Nanshu
DOI：
10.1111/j.1095-8312.1996.tb01451.x
发表时间：
1996-09-01
影响因子：
1.9
作者：
Irschick, DJ;Austin, CC;Ellers, O
通讯作者：
Ellers, O