Modeling of the stress-strain behavior of an epoxy-based nanocomposite filled with silica nanoparticles
Modeling of the stress-strain behavior of an epoxy-based nanocomposite filled with silica nanoparticles
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DOI：
10.1016/j.matdes.2015.10.038
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发表时间：
2016-01
影响因子：
8.4
通讯作者：
A. Dmitriev;I. Häusler;W. Österle;B. Wetzel;Ga Zhang
中科院分区：
文献类型：
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作者：
A. Dmitriev;I. Häusler;W. Österle;B. Wetzel;Ga Zhang
采用可移动元胞自动机（MCA）方法模拟了环氧树脂基体与体积分数为6%的环氧树脂复合材料的应力-应变行为。二氧化硅纳米颗粒。用于建模的元件的尺寸固定在10 nm，大致对应于填料颗粒的直径。由于该模型不仅考虑了两组分的应力应变响应，而且考虑了相邻颗粒的脱粘和颗粒流动，因此可以模拟塑性变形以及裂纹的萌生和扩展。将建模结果与纯环氧树脂以及环氧树脂-6体积%的拉伸试验结果进行比较。SiO2复合材料。由于假设两种组分的本体性质没有产生令人满意的结果，因此对纳米颗粒响应函数和纳米结构进行了数值测试。最后，人们观察到，只有假设环氧树脂的强度特性略有增加，实验结果和建模结果之间才会产生良好的相关性。这归因于二氧化硅纳米颗粒的存在引起的环氧树脂的交联增加。
The method of movable cellular automata (MCA) was applied to simulate the stress–strain behavior of a nanocomposite consisting of an epoxy matrix and 6 vol.% silica nanoparticles. The size of the elements used for modeling was fixed at 10 nm, corresponding approximately to the diameter of the filler particles. Since not only the stress–strain response of the two constituents but also debonding of neighboring particles and granular flow was taken into account, plastic deformation as well as crack initiation and propagation could be simulated with the model. Modeling results were compared with tensile test results of both, pure epoxy as well as the epoxy–6 vol.% SiO2composite. Since assuming bulk properties of the two constituents did not yield satisfactory results, slight modifications of the nanoparticle response functions and nanostructures were tested numerically. Finally, it was observed that only the assumption of slightly increased strength properties of the epoxy yielded good correlation between experimental and modeling results. This was attributed to an increased cross linking of the epoxy caused by the presence of silica nanoparticles.