A Discrete Multi-Physics Model to Simulate Fluid Structure Interaction and Breakage of Capsules Filled with Liquid under Coaxial Load
A Discrete Multi-Physics Model to Simulate Fluid Structure Interaction and Breakage of Capsules Filled with Liquid under Coaxial Load
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DOI：
10.3390/pr9020354
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发表时间：
2021-02
期刊：
影响因子：
3.5
通讯作者：
I. Ruiz-Riancho;A. Alexiadis;Zhibing Zhang;Alvaro Garcia Hernandez
中科院分区：
文献类型：
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作者：
I. Ruiz-Riancho;A. Alexiadis;Zhibing Zhang;Alvaro Garcia Hernandez
采用离散多物理场方法研究了单芯壳胶囊在压缩载荷下的力学响应（包括胶囊破裂和胶囊内液体的释放）。该模型结合了光滑粒子流体动力学模型的流体和晶格弹簧模型的弹性膜。由于离散多物理场的无网格性质，该模型可以很容易地解释胶囊外壳的破裂以及内部液体和固体外壳之间的相互作用。模拟复制了单个核壳胶囊的平行板压缩试验。模型的输入是胶囊的大小、外壳的厚度、内部结构的几何形状、外壳材料的杨氏模量以及流体的密度和粘度。模型的输出是骨折类型、骨折所需的最大力和力-位移曲线。通过在实验室中再现等效实验测试来验证数据。模拟准确地再现了具有不同机械性能的胶囊的破裂。所提出的模型可以用作设计胶囊的工具，在应力下，在特定时间破裂并释放其内部液体。
This paper investigated the mechanical response (including breakage and release of the internal liquid) of single core–shell capsules under compression by means of discrete multi-physics. The model combined Smoothed Particle Hydrodynamics for modelling the fluid and the Lattice Spring Model for the elastic membrane. Thanks to the meshless nature of discrete multi-physics, the model can easily account for the fracture of the capsule’s shell and the interactions between the internal liquid and the solid shell. The simulations replicated a parallel plate compression test of a single core–shell capsule. The inputs of the model were the size of the capsule, the thickness of the shell, the geometry of the internal structure, the Young’s modulus of the shell material, and the fluid’s density and viscosity. The outputs of the model were the fracture type, the maximum force needed for the fracture, and the force–displacement curve. The data were validated by reproducing equivalent experimental tests in the laboratory. The simulations accurately reproduced the breakage of capsules with different mechanical properties. The proposed model can be used as a tool for designing capsules that, under stress, break and release their internal liquid at a specific time.