网链缠结对凝胶薄膜起皱的影响

发布时间：2018-03-27 06:47

本文选题：合物凝胶　切入点：凝胶自由能　出处：《力学季刊》2016年04期

【摘要】：凝胶薄膜在变形时易发生屈曲、起皱等失稳现象,这在凝胶薄膜的应用中是非常重要的.近年来,针对凝胶薄膜的屈曲、起皱失稳行为,越来越多的科研人员尝试从力学角度进行分析.但是大多数的研究是基于Flory-Rehner弹性凝胶理论,未考虑凝胶网链缠结引起的物理交联对凝胶自由能的影响,模型精度不高.本文采用Edwards-Vilgis所提出的Slip-link模型对平面内起皱的凝胶薄膜进行分析,研究了不伸展参数、滑移参数对聚合物凝胶增量模量的影响以及不伸展参数、滑移参数、基底材料泊松比对凝胶薄膜起皱时的临界波长和临界应力的影响.结果表明:化学势在一定范围内变化时,随着化学势的增加,增量模量、临界波长、临界应力减小;不可伸长参数越大,增量模量、临界波长及临界应力越大;滑移参数越大,增量模量、临界波长及临界应力越小.
[Abstract]:The buckling and wrinkling of gel films are very important in the application of gel films. In recent years, the buckling and wrinkling behavior of gel films have been studied. More and more researchers are trying to analyze the gel from a mechanical point of view. But most of the research is based on the Flory-Rehner elastic gel theory, without considering the effect of physical crosslinking caused by network entanglement on the gel free energy. The model accuracy is not high. In this paper, the Slip-link model proposed by Edwards-Vilgis is used to analyze the wrinkled gel film in the plane, and the influence of the unstretching parameter, the slip parameter on the incremental modulus of the polymer gel, the unstretching parameter and the slip parameter are studied. The influence of Poisson's ratio on critical wavelength and critical stress of gel film during wrinkling. The results show that when the chemical potential changes in a certain range, the increment modulus, critical wavelength and critical stress decrease with the increase of chemical potential. The larger the imextensibility parameter, the greater the increment modulus, critical wavelength and stress, and the smaller the increment modulus, critical wavelength and critical stress.
【作者单位】：同济大学航空航天与力学学院;三明学院机电工程学院;
【分类号】：O343.9

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