Bending of Soft Micropatterns in Elastohydrodynamic Lubrication Tribology
Bending of Soft Micropatterns in Elastohydrodynamic Lubrication Tribology
复制标题
弹流润滑摩擦学中软微图案的弯曲
DOI：
10.1007/s11340-021-00715-8
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发表时间：
2021
影响因子：
2.4
通讯作者：
Hsiao, L. C.
中科院分区：
文献类型：
--
作者：
Peng, Y.;Serfass, C. M.;Hill, C. N.;Hsiao, L. C.
背景软摩擦学在机器人、触觉和生物力学研究中所用材料的设计和工程中越来越重要。当图案化表面是经历滑动和压缩变形的润滑摩擦对的一部分时，图案经历影响润滑膜厚度和弹性流体动力学摩擦的弯曲应变。弯曲模式对软摩擦学的贡献还没有得到很好的理解，因为早期的研究集中在具有有效平坦表面的硬摩擦对上。目的我们研究并建模聚乙烯润滑摩擦的差异（二甲基硅氧烷）（PDMS）弹性体和PEGDA/藻酸盐双网络水凝胶模式，以确定高度对水凝胶的影响。方法将两种不同粘度的光刻胶旋涂到硅衬底上，制作图案高度为20 μm ~ 50 μm的模具，在弹性流体动力润滑状态下的摩擦对的表征表明，对于短图案，图案产生与纵横比无关的摩擦峰值，但是对于较高图案，随着纵横比的增加，图案显示出“幂律拟合”减小。两个独立的模型被用来估计的理论弯曲和偏转角的tribopairs.ConclusionsThe润滑摩擦的减少是由于较高的模式具有较大的弯曲角度和流体载荷轴承的有效表面减少。结果表明，微图案的弯曲可以利用工程师在各种应用中的润滑摩擦。
BackgroundSoft tribology is increasingly important in the design and engineering of materials used in robotics, haptics, and biomechanics studies. When patterned surfaces are part of a lubricated tribopair that undergoes sliding and compressive deformation, the patterns experience a bending strain that affects the lubrication film thickness and elastohydrodynamic friction. The contribution of bending patterns to soft tribology is not well understood because earlier studies focused on hard tribopairs with effectively flat surfaces.ObjectiveWe investigate and model the differences in lubricated friction for poly(dimethyl siloxane) (PDMS) elastomer and PEGDA/alginate double network hydrogel patterns in order to determine the effect of height-to-width aspect ratio and bending angle on the elastohydrodynamic friction.MethodsPhotoresists of two different viscosities are spin coated onto silicon substrates to fabricate molds with pattern heights ranging from 20 μm to 50 μm.ResultsTribological characterization of the tribopairs in the elastohydrodynamic lubrication regime shows that the patterns generate a friction peak that is independent of aspect ratio for short patterns but displays a “power-law fit” decrease with increasing aspect ratio for taller patterns. Two independent models are used to estimate the theoretical bending and deflection angles for the tribopairs.ConclusionsThe decrease in lubricated friction is attributed to taller patterns having large bending angles and a reduced effective surface for fluid load bearing. Results suggest that the bending of micropatterns could be harnessed to engineer lubricated friction in a variety of applications.
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DOI：
10.1080/17515831.2017.1400779
发表时间：
2017
期刊：
Tribology - Materials, Surfaces & Interfaces
影响因子：
--
作者：
Angela A. Pitenisa;Juan Manuel Urueñaa;Eric O. McGheea;Samuel M. Harta;Kyle D. Schulzea;Samantha L. Marshalla;Alexander I. Bennetta;Sean R. Niemia;Thomas E. Angelinia;Alison C. Dunnb
通讯作者：
Alison C. Dunnb
影响因子：
3.4
作者：
Yuan-Nan Young;Matthew Downs;Christopher R. Jacobs
通讯作者：
Yuan-Nan Young;Matthew Downs;Christopher R. Jacobs
影响因子：
6.1
作者：
Duprat, Camille;Berthet, Helene;Lindner, Anke
通讯作者：
Lindner, Anke
用仿生舌头探测口腔内的质地感知
影响因子：
3.9
作者：
Jean;Javier Contreras Pastenes;C. Pipe;B. le Révérend;E. Wandersman;A. Prevost
通讯作者：
A. Prevost
影响因子：
3.1
作者：
Lauga, Eric;Pipe, Christopher J.;Le Reverend, Benjamin
通讯作者：
Le Reverend, Benjamin