浸入网络中的粘弹性多尺度问题
Viscoelastic multiscaling in immersed networks
摘要：
流变响应是描述软物质的最相关特征。到目前为止，这样的本构关系仍然没有很好地理解在小尺度性能方面，虽然这方面的知识将有助于合成和生物材料的设计。在这里，我们调查，计算和分析，介观尺度的相互作用如何影响粘弹性材料的宏观行为。我们设计了一个粗粒度的方法，可以控制当地的弹性和粘性的贡献。应用分子动力学模拟，我们模仿真正的压痕试验。当弹性力占主导地位时，我们的模型再现了赫兹行为。但是，当摩擦力增加时，它将恢复标准线性实体模型。我们的响应参数取决于微观弹性和粘性的贡献。此外，我们的研究结果还表明，弛豫时间，在松弛和振荡实验中得到的，服从粘弹性材料的普遍行为。
英文摘要：
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.
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