TY  - EJOU
AU  - Zhao, Gaoge 
AU  - Chen, Jianzhong 
AU  - Lv, Yong 
AU  - Zhang, Xiaoyu 
AU  - Huang, Li 

TI  - Simulation of Elastic and Fatigue Properties of Epoxy/SiO<sub>2</sub> Particle Composites through Molecular Dynamics
T2  - Computer Modeling in Engineering \& Sciences

PY  - 2021
VL  - 128
IS  - 1
SN  - 1526-1506

AB  - The influence of different nanoparticle sizes on the elastic modulus and the fatigue properties of epoxy/SiO<sub>2</sub> nanocomposite is studied in this paper. Here, the cross-linked epoxy resins formed by the combination of DGEBA and 1,3-phenylenediamine are used as the matrix phase, and spherical SiO<sub>2</sub> particles are used as the reinforcement phase. In order to simulate the elastic modulus and long-term performance of the composite material at room temperature, the simulated temperature is set to 298 K and the mass fraction of SiO<sub>2</sub> particles is set to 28.9%. The applied strain rate is 10<sup>9</sup>/s during the simulation of the elastic modulus. The results show that the elastic modulus of the material increases with the increase in particle size. Furthermore, fatigue simulation under strain control is performed on the model with SiO<sub>2</sub> nanoparticle radius of 12 Å. The results indicate that the influence trend of variable frequencies on the fatigue mechanical response is similar, and the mean stress decreases with the increase in number of cycles. In addition, the smaller the loading period and the more the number of cycles, the greater the mean stress reduction. Finally, the change in energy and free volume fraction are evaluated under fatigue loading condition.
KW  - SiO<sub>2</sub> particle; elastic modulus; fatigue; free volume; molecular dynamics

DO  - 10.32604/cmes.2021.015388