粘弹性极限下的地形脱粘
Topographic De-adhesion in the Viscoelastic Limit
摘要：
许多天然表面在抵抗柔软、粘性生物污垢方面的优势激发了动态地形与机械不稳定性的整合，以促进自清洁人工表面。这种新机制背后的物理学目前仅限于弹性生物污垢，其中表面能、弯曲刚度和形貌波长是关键因素。然而，许多生物污垢的粘弹性性质导致这些因素与时间相关的特性，如材料软化和加载速率之间的复杂的相互作用。在这里，我们丰富了目前的弹性理论的地形脱粘使用分析和有限元模型来阐明三个物理的，无量纲的参数的非线性，时间依赖性的相互作用：生物污垢的刚度降低，松弛时间和加载速率的产品，和短期弹性脱粘的临界应变。理论预测，在良好的协议与数值模拟，提供洞察调整这些控制参数，以优化表面更新通过地形脱粘在粘弹性制度。
英文摘要：
The superiority of many natural surfaces at resisting soft, sticky biofoulants has inspired the integration of dynamic topography with mechanical instability to promote self-cleaning artificial surfaces. The physics behind this novel mechanism is currently limited to elastic biofoulants where surface energy, bending stiffness, and topographical wavelength are key factors. However, the viscoelastic nature of many biofoulants causes a complex interplay between these factors with time-dependent characteristics such as material softening and loading rate. Here, we enrich the current elastic theory of topographic de-adhesion using analytical and finite element models to elucidate the non-linear, time-dependent interaction of three physical, dimensionless parameters: biofoulant's stiffness reduction, product of relaxation time and loading rate, and the critical strain for short-term elastic de-adhesion. Theoretical predictions, in good agreement with numerical simulations, provide insight into tuning these control parameters to optimize surface renewal via topographic de-adhesion in the viscoelastic regime.
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