Numerical Analysis of the Fracture Toughness of Low-Density Open-Cell Voronoi Foams
Numerical Analysis of the Fracture Toughness of Low-Density Open-Cell Voronoi Foams
复制标题
低密度开孔 Voronoi 泡沫断裂韧性的数值分析
DOI：
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发表时间：
2019
影响因子：
1.7
通讯作者：
S. Guo
中科院分区：
文献类型：
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作者：
J. Li;B. Wang;S. Guo
在本研究中，使用基于Voronoi镶嵌的模型模拟开孔泡沫的几何形状。采用基于微力学模型的有限元方法计算了含Voronoi孔的ⅰ型、ⅱ型和混合型开孔泡沫的断裂韧性。微力学模型中的裂纹是通过去除与裂纹长度有关的一些单元而产生的。基于线弹性断裂力学计算，将位移边界条件应用于裂纹尖端周围的小区域边界。讨论了相对密度、无序系数和样本量对Voronoi孔开孔泡沫预测弹性性能和断裂韧性的影响，并与文献结果进行了比较。
In this study, the geometry of open-cell foams is simulated using a model based on Voronoi tessellations. The fracture toughness of open-cell foams with Voronoi cells, including Mode-I, Mode-II, and the mixed-mode ones, are calculated by the finite-element method based on a micromechanical model. Cracks in the micromechanical model are created through removing some number of cells pertaining to the crack length. Displacement boundary conditions are applied to the boundary of a small region surrounding the crack tip, which are calculated based on the linear elastic fracture mechanics. The effects of relative density, disorder factor and sample size on the predicted elastic properties and fracture toughness of open-cell foams with Voronoi cells are discussed and compared with results available in the literature.