Takase Naohiro, Koyanagi Jun, Mori Kazuki, Sakai Takenobu
Department of Materials Science and Technology, Graduate School of Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Department of Materials Science and Technology, University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Materials (Basel). 2021 Apr 10;14(8):1884. doi: 10.3390/ma14081884.
Herein, the stress-state dependence of fracture entropy for a polyamide 6 material is investigated through molecular dynamics simulations. Although previous research suggests that a constant entropy increase can be universally applied for the definition of material fracture, the dependence of stress triaxiality has not yet been discussed. In this study, entropy values are evaluated by molecular dynamics simulations with varied combined stress states. The calculation is implemented using the 570,000 all-atom model. Similar entropy values are obtained independently of stress triaxiality. This study also reveals the relationship between material damage, which is correlated with void size, and the entropy value.
在此，通过分子动力学模拟研究了聚酰胺6材料断裂熵的应力状态依赖性。尽管先前的研究表明，恒定的熵增加可普遍用于定义材料断裂，但应力三轴性的依赖性尚未得到讨论。在本研究中，通过具有不同组合应力状态的分子动力学模拟来评估熵值。计算使用570,000个全原子模型进行。获得了与应力三轴性无关的相似熵值。本研究还揭示了与空洞尺寸相关的材料损伤与熵值之间的关系。
