Modelling of Mechanical Behavior of Biopolymer Alginate Aerogels Using the Bonded-Particle Model
Modelling of Mechanical Behavior of Biopolymer Alginate Aerogels Using the Bonded-Particle Model
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DOI：
10.3390/molecules24142543
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发表时间：
2019-07-02
期刊：
影响因子：
4.6
通讯作者：
Gurikov, Pavel
中科院分区：
文献类型：
--
作者：
Dosta, Maksym;Jarolin, Kolja;Gurikov, Pavel
提出了一种新的介观模拟方法，用于研究海藻酸盐气凝胶的力学性能。该方法基于离散元法和粘结颗粒模型。不直接考虑气凝胶的纳米结构，而是在介观尺度上将气凝胶的高度多孔结构表示为通过固体键连接的一组固体颗粒。为了描述流变材料的行为，一个新的弹塑性功能模型的固体债券已被开发。该模型是基于材料宏观和细观行为的自相似原理导出的。为了分析所提出的方法的有效性，分析了具有不同交联度（钙含量）的海藻酸盐气凝胶的行为。实验和数值计算结果的比较表明，该方法可以有效地用于预测宏观尺度上的气凝胶的力学行为。
A novel mesoscale modelling approach for the investigation of mechanical properties of alginate aerogels is proposed. This method is based on the discrete element method and bonded-particle model. The nanostructure of aerogel is not directly considered, instead the highly porous structure of aerogels is represented on the mesoscale as a set of solid particles connected by solid bonds. To describe the rheological material behavior, a new elastic-plastic functional model for the solids bonds has been developed. This model has been derived based on the self-similarity principle for the material behavior on the macro and mesoscales. To analyze the effectiveness of the proposed method, the behavior of alginate aerogels with different crosslinking degrees (calcium content) was analyzed. The comparison between experimental and numerical results has shown that the proposed approach can be effectively used to predict the mechanical behavior of aerogels on the macroscale.