论文标题
沉浸网络中的粘弹性多标准
Viscoelastic multiscaling in immersed networks
论文作者
论文摘要
流变响应是描述软物质的最相关特征。到目前为止，尽管这些知识将有助于合成和生物材料的设计，但从小规模的特性方面，这种构成关系仍未得到很好的理解。在这里，我们在计算和分析上研究介质尺度相互作用如何影响粘弹性材料的宏观行为。我们设计了一种粗粒的方法，可以控制局部弹性和粘性贡献。应用分子动力学模拟，我们模仿实际的压痕测定。当弹性力占主导地位时，我们的模型就会再现赫兹的行为。但是，当摩擦增加时，它会恢复标准线性固体模型。我们展示了响应参数如何取决于微观弹性和粘性贡献。此外，我们的发现还表明，在放松和振荡实验中获得的松弛时间遵守粘弹性材料的普遍行为。
Rheological responses are the most relevant features to describe soft matter. So far, such constitutive relations are still not well understood in terms of small scale properties, although this knowledge would help the design of synthetic and bio-materials. Here, we investigate, computational and analytically, how mesoscopic-scale interactions influence the macroscopic behavior of viscoelastic materials. We design a coarse-grained approach where the local elastic and viscous contributions can be controlled. Applying molecular dynamics simulations, we mimic real indentation assays. When elastic forces are dominant, our model reproduces the hertzian behavior. However, when friction increases, it restores the Standard Linear Solid model. We show how the response parameters depend on the microscopic elastic and viscous contributions. Moreover, our findings also suggest that the relaxation times, obtained in relaxation and oscillatory experiments, obey a universal behavior in viscoelastic materials.
