A 2.5D approach to the mechanics of electrospun fibre mats,Soft Matter

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A 2.5D approach to the mechanics of electrospun fibre mats
Soft Matter ( IF 2.9 ) Pub Date : 2017-09-06 00:00:00 , DOI: 10.1039/c7sm01241a
Manuel Zündel _{1,

2,

3,

4} , Edoardo Mazza _{1,

2,

3,

4,

5} , Alexander E. Ehret _{1,

2,

3,

4,

5}

Affiliation

In this paper, a discrete random network modelling approach specific to electrospun networks is presented. Owing to the manufacturing process, fibres in these materials systems have an enormous length, as compared to their diameters, and form sparse networks since fibre contact over thickness is limited to a narrow range. Representative volume elements are generated, in which fibres span the entire domain, and a technique is developed to apply computationally favourable periodic boundary conditions despite the initial non-periodicity of the networks. To capture sparsity, a physically motivated method is proposed to distinguish true fibre cross-links, in which mechanical interaction takes place, from mere fibre intersections. The model is exclusively informed by experimentally accessible parameters, demonstrates excellent agreement with the mechanical response of electrospun fibre mats, captures typical microscopic deformation patterns, and provides information on the kinematics of fibres and pores. This ability to address relevant mechanisms of deformation at both micro- and macroscopic length scales, together with the moderate computational cost, render the proposed modelling approach a highly qualified tool for the computer-based design and optimization of electrospun networks.

中文翻译：

2.5D静电纺纤维毡的力学方法

在本文中，提出了一种针对静电纺丝网络的离散随机网络建模方法。由于制造过程，这些材料系统中的纤维与其直径相比具有很大的长度，并且由于纤维在整个厚度上的接触被限制在一个狭窄的范围内，因此形成了稀疏的网络。生成了具有代表性的体积元素，其中的纤维跨越了整个域，并且开发了一种技术，尽管网络最初没有周期性，但仍应用了计算上有利的周期性边界条件。为了捕获稀疏性，提出了一种物理激励方法来区分真正的纤维交联和单纯的纤维交叉，在纤维交联中发生机械相互作用。该模型专门通过实验可访问的参数提供信息，证明与电纺纤维毡的机械响应极佳的一致性，可捕获典型的微观变形模式，并提供有关纤维和孔的运动学信息。这种解决微观和宏观长度尺度上的变形相关机制的能力，加上适度的计算成本，使得所提出的建模方法成为用于基于电纺丝网络的计算机设计和优化的高质量工具。

更新日期：2017-09-06

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