纤维纵横比对软弹性纤维黏附性和硬度的影响。
The effect of aspect ratio on adhesion and stiffness for soft elastic fibres.
机构信息
Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
出版信息
J R Soc Interface. 2011 Aug 7;8(61):1166-75. doi: 10.1098/rsif.2010.0582. Epub 2011 Jan 12.
Abstract
The effect of aspect ratio on the pull-off stress and stiffness of soft elastic fibres is studied using elasticity and numerical analysis. The adhesive interface between a soft fibre and a smooth rigid surface is modelled using the Dugdale-Barenblatt model. Numerical simulations show that, while pull-off stress increases with decreasing aspect ratio, fibres get stiffer. Also, for sufficiently low aspect ratio fibres, failure occurs via the growth of internal cracks and pull-off stress approaches the intrinsic adhesive strength. Experiments carried out with various aspect ratio polyurethane elastomer fibres are consistent with the numerical simulations.
摘要
采用弹性力学和数值分析的方法研究了纤维纵横比对其拔出应力和拔出刚度的影响。采用 Dugdale-Barenblatt 模型模拟软纤维与光滑刚性表面之间的黏附界面。数值模拟表明，尽管拔出应力随纵横比的减小而增大，但纤维会变得更硬。此外，对于纵横比足够低的纤维，失效是通过内部裂纹的扩展而发生的，并且拔出应力接近固有黏附强度。用不同纵横比的聚氨酯弹性纤维进行的实验与数值模拟结果一致。
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