Deng Pan, Chang-Xin Liu, Ze-Yang Zhang, Yu-Jin Gao, Xiu-Hong Hao. Effect of velocity on polytetrafluoroethylene friction coefficient using molecular dynamics simulaiton [J]. Acta Physica Sinica, 2019, 68(17): 176801-1
- Acta Physica Sinica
- Vol. 68, Issue 17, 176801-1 (2019)
Fig. 1. (a) Chemical structure; (b) all-atom model; (c) mapping scheme; (d) coarse-grained model.(a) 化学式; (b) 全原子模型; (c) 映射原理; (d) 粗粒化模型
Fig. 2. Schematic of interaction among beads.粒子间相互作用势
Fig. 3. The coarse-grained PTFE-PTFE friction model: (a) Initial distribution; (b) random distribution; (c) equilibrium distribution; (d) final distribution.PTFE-PTFE摩擦的粗粒化模型 (a)初始分布; (b)随机分布; (c)平衡态分布; (d)最终分布
Fig. 4. (a) Friction force; (b) normal force; (c) friction coefficient as a function of simulation time.(a) 摩擦力; (b)正压力; (c)摩擦系数随模拟时间的变化
Fig. 5. Effect of velocity on friction coefficient when the externally applied load is 31 MPa.当外载荷为31 MPa时, 摩擦系数随速度的变化
Fig. 6. (a) Bond length and (b) bond angle distributions of the bottom PTFE molecules within the contact area under different velocities.不同速度下接触区内下层PTFE的键长 (a)和键角分布 (b)
Fig. 7. Distributions of radius of gyration along (a) x and (b) z directions of the bottom PTFE molecules within the contact area.
接触区内下层PTFE分子沿(a) x 方向及(b) z 方向的回转半径分布
Fig. 8. (a) Friction force and (b) normal force as a function of simulation time.(a) 摩擦力和(b) 正压力随模拟时间的变化
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