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Coulomb friction in twisting of biomimetic scale-covered substrate.
Bioinspiration & Biomimetics ( IF 3.4 ) Pub Date : 2020-08-11 , DOI: 10.1088/1748-3190/ab9f80
Hossein Ebrahimi 1 , Hessein Ali , Ranajay Ghosh
Affiliation  

Biomimetic scale-covered substrates provide geometric tailorability via scale orientation, spacing and also interfacial properties of contact in various deformation modes. No work has investigated the effect of friction in twisting deformation of biomimetic scale-covered beams. In this work, we investigate the frictional effects in the biomimetic scale-covered structure by developing an analytical model verified by finite element simulations. In this model, we consider dry (Coulomb) friction between rigid scales surfaces, and the substrate as the linear elastic rectangular beam. The obtained results show that the friction has a dual contribution on the system by advancing the locking mechanism due to change of mechanism from purely kinematic to interfacial behavior, and stiffening the twist response due to sharp increase in the engagement forces. We also discovered, by increasing the coefficient of friction potentially using engineering scale surfaces to a critical coefficient, ...

中文翻译:

仿生鳞片覆盖基材扭曲时的库仑摩擦。

仿生尺度覆盖的基材通过尺度方向、间距以及各种变形模式下接触的界面特性提供几何可定制性。没有工作研究摩擦对仿生鳞片覆盖梁扭曲变形的影响。在这项工作中,我们通过开发一个经有限元模拟验证的分析模型来研究仿生规模覆盖结构中的摩擦效应。在此模型中,我们将刚性鳞片表面与基底之间的干(库仑)摩擦视为线弹性矩形梁。获得的结果表明,摩擦对系统有双重贡献,因为机制从纯粹的运动学转变为界面行为,从而推进锁定机制,并由于接合力的急剧增加而加强了扭曲响应。
更新日期:2020-08-12
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