arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.09767cond-mat.soft
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软固体表面的粘弹性和多孔弹性松弛

Viscoelastic and poroelastic relaxations of soft solid surfaces

Qin Xu, Lawrence A. Wilen, Katharine E. Jensen, Robert W. Style, Eric R. Dufresne

摘要:

了解软固体的表面力学,如软聚合物凝胶,在许多工程过程中是至关重要的,如动态润湿和粘合失效。在这些情况下,毛细管力和弹性力的组合驱动运动,该运动通过耗散机制来平衡以确定速率。虽然剪切流变学(即粘弹性)一直被认为是主导的耗散,最近的工作表明,压缩性效应(即孔隙弹性)可以在溶胀网络中发挥作用。我们使用快速干涉成像来量化由于位移接触线的表面变形的松弛。通过系统地测量在不同的时间和长度尺度的配置文件,我们实验观察到的交叉从粘弹性多孔弹性表面松弛。

英文摘要:

Understanding surface mechanics of soft solids, such as soft polymeric gels, is crucial in many engineering processes, such as dynamic wetting and adhesive failure. In these situations, a combination of capillary and elastic forces drives the motion, which is balanced by dissipative mechanisms to determine the rate. While shear rheology (i.e. viscoelasticity) has long been assumed to dominate the dissipation, recent works have suggested that compressibility effects (i.e. poroelasticity) could play roles in swollen networks. We use fast interferometric imaging to quantify the relaxation of surface deformations due to a displaced contact line. By systematically measuring the profiles at different time and length scales, we experimentally observe a crossover from viscoelastic to poroelastic surface relaxations.

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