Wang Wenhai, Sadeghipour Keya, Baran George
Compos Part A Appl Sci Manuf. 2008 Jun;39(6):956-964. doi: 10.1016/j.compositesa.2008.03.016.
A numerical method was used to study the interaction between a crack and the filler phase in a particle-reinforced polymer composite. The simulation was achieved by implementing a progressive damage-and-failure material model and element-removal technique through finite element analysis, providing a framework for the quantitative prediction of the deformation and fracture response of the composite. The effect of an interphase on composite toughness was also studied. Results show that a thin and high strength interphase results in efficient stress transfer between particle and matrix and causes the crack to deflect and propagate within the matrix. Alternatively, a thick and low strength interphase results in crack propagation within the interphase layer, and crack blunting. Further analysis of the effect of volume fraction and particle-particle interactions on fracture toughness as well as prediction of the fracture toughness can also be achieved within this framework.
采用数值方法研究了颗粒增强聚合物复合材料中裂纹与填料相之间的相互作用。通过有限元分析实现了渐进损伤与失效材料模型和单元去除技术的模拟，为定量预测复合材料的变形和断裂响应提供了框架。还研究了界面相复合材料韧性的影响。结果表明，薄而高强度的界面相会导致颗粒与基体之间的有效应力传递，并使裂纹在基体内发生偏转和扩展。相反，厚而低强度的界面相会导致裂纹在界面层内扩展，并使裂纹钝化。在此框架内，还可以进一步分析体积分数和颗粒间相互作用对断裂韧性的影响以及对断裂韧性的预测。
