论文标题
关于壁虎刮刀剥离中临界脱离角的存在 - 使用粘合摩擦模型的数值研究
On the presence of a critical detachment angle in gecko spatula peeling -- A numerical investigation using an adhesive friction model
论文作者
论文摘要
采用基于连续的计算接触模型来研究壁虎刮刀中的耦合粘附和摩擦。进行非线性有限元分析以模拟刚性底物的刮铲剥离。结果表明，直到现在，“摩擦粘附”行为也只有从SETA到脚趾水平观察到的，也存在于刮铲水平。结果表明，对于足够小的小铲垫厚度，刮铲以恒定角度分离为临界脱离角，与剥离和轴角无关。刮铲在跳转接触点达到相同的能量状态，这与临界脱离角的不变性直接相关。这项研究还表明，与临界脱离角的不变性相关的最佳垫厚度。进一步观察到，铲垫的滑动对于临界脱离角的不变性至关重要。
A continuum-based computational contact model is employed to study coupled adhesion and friction in gecko spatulae. Nonlinear finite element analysis is carried out to simulate spatula peeling from a rigid substrate. It is shown that the "frictional adhesion" behavior, until now only observed from seta to toe levels, is also present at the spatula level. It is shown that for sufficiently small spatula pad thickness, the spatula detaches at a constant angle known as the critical detachment angle irrespective of the peeling and shaft angles. The spatula reaches the same energy states at the jump-off contact point, which directly relates to the invariance of the critical detachment angle. This study also reveals that there is an optimum pad thickness associated with the invariance of the critical detachment angle. It is further observed that the sliding of the spatula pad is essential for the invariance of the critical detachment angle.
