Zuo Pingcheng, Ji Jiaxin, Tadmor Rafael, Liu Jianlin
Department of Engineering Mechanics, College of Pipeline and Civil Engineering, China University of Petroleum (East China), 266580, Qingdao, China.
College of Mechanical and Electronic Engineering, China University of Petroleum (East China), 266580, Qingdao, China.
Eur Phys J E Soft Matter. 2019 Nov 22;42(11):147. doi: 10.1140/epje/i2019-11913-9.
A particle raft is formed by a layer of small particles floating on a water surface, which has a higher load bearing capacity than pure water. In the present work, we have made a comprehensive study on the wrinkling number and force of the particle raft in planar compression. The wrinkling number during the whole loading process is measured, accompanied with snapshots on the morphologies of the particle raft. The force-displacement curve is given based on the loading system, which has been validated by the numerical simulation. Moreover, the experiment and theoretical results both show that the equivalent Young's modulus is dependent upon the loading displacement. Finally, the maximum wrinkling number of the raft has been analyzed by the scaling law, which agrees well with the experimental result. These findings have deepen our understandings on the mechanical properties of soft materials, which also hold implications on drug delivery, chemical engineering, micro-fluidics, environment protection, petroleum exploitation, mineral flotation, etc.
颗粒筏是由一层漂浮在水面上的小颗粒形成的，其承载能力比纯水更高。在本研究中，我们对颗粒筏在平面压缩时的褶皱数和力进行了全面研究。测量了整个加载过程中的褶皱数，并拍摄了颗粒筏形态的快照。基于加载系统给出了力-位移曲线，该曲线已通过数值模拟验证。此外，实验和理论结果均表明，等效杨氏模量取决于加载位移。最后，通过标度律分析了筏的最大褶皱数，该结果与实验结果吻合良好。这些发现加深了我们对软材料力学性能的理解，这对药物输送、化学工程、微流体、环境保护、石油开采、矿物浮选等也具有重要意义。
