Modeling of fatigue crack in particle reinforced composites with Voronoi cell finite element method
Modeling of fatigue crack in particle reinforced composites with Voronoi cell finite element method
复制标题
用 Voronoi 单元有限元法模拟颗粒增强复合材料的疲劳裂纹
DOI：
10.1016/j.proeng.2012.01.1026
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
郭然
中科院分区：
文献类型：
--
作者：
郭然
采用新的Voronoi单元有限元法（VCFEM），考虑基体-夹杂界面疲劳裂纹和基体疲劳裂纹，对颗粒增强复合材料的疲劳裂纹萌生和扩展进行了模拟。在新单元中，当裂纹在各种可能的变化载荷作用下闭合时，通过重新划分网格的方法，考虑了裂纹边缘的各种可能接触。当疲劳损伤超过某一临界损伤值时，疲劳裂纹开始萌生，通过逐步寻找裂纹扩展方向和新的裂纹尖端来模拟疲劳裂纹扩展，采用了将裂纹尖端的一个损伤节点替换为一对节点的网格重划分方法，在裂纹扩展方向上分配一个新的裂纹尖端节点，并在裂纹尖端附近的裂纹边缘增加一对节点，更好地促进自由牵引边界条件。比较了建议的VCFEM和商业有限元软件MARC的结果。以含20个椭圆夹杂的颗粒增强金属基复合材料为例，模拟了平面应力条件下疲劳裂纹的萌生和扩展。该方法是一种处理复合材料界面损伤的有效方法。
The modeling of fatigue crack initiation and propagation for particulate reinforced composites is facilitated with new Voronoi cell finite element method (VCFEM), considering the matrix-inclusion interfacial fatigue crack and matrix fatigue crack. In the new element, all possible contacts on the crack edge are considered by remeshing method, when the crack is closing under all possible changing loads. The fatigue crack initiates when the fatigue damage exceeds certain critical damage value, and fatigue crack propagation are simulated by gradual seeking crack propagating directions and new crack tips, using a remeshing method that a damaged node at the crack tip is replaced by a pair of nodes, a new crack tip node is assigned at the crack propagating directions and a more pair of nodes are needed to be added on the crack edge near the crack tip in order to better facilitate the free-traction boundary condition. The comparison of the results of proposed VCFEM and commercial finite element packages MARC. An example has been given for Particle-reinforced metal-matrix composites with 20 elliptical inclusions to simulate the fatigue crack initiation and propagation under plane stress conditions. It appears that this method is a more efficient way to deal with the interfacial damage of composite materials.
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DOI：
10.1002/nme.1620381004
发表时间：
1995-05
影响因子：
2.9
作者：
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DOI：
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影响因子：
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