| 摘要: |
| 根据独立振子模型的能量耗散机理，以光滑干摩擦接触平面为对象，利用金属晶体的强体积效应特征，构造了简化计算的界面势能模型，分析了在界面摩擦状态下能量非连续耗散过程，建立了简化计算滑动摩擦力与摩擦因数模型。从瞬间原子位置图和系统能量方面，进行计算模拟和试验对比验证，结果表明：当接触界面势能处在某个谷底时，滑块受静摩擦力，界面间发生相对运动，滑块变为受滑动摩擦力作用；摩擦力按基本不变的斜率增加到某一值后突然降低，而后变化呈现一定的周期性；随着滑动的逐渐进行，运动体与基体表面的温度逐渐增加而后趋于稳定，两表面存在温度差；滑动后界面平均接触压力明显下降，而后趋于平缓。 |
| 关键词: 分子动力学 界面势能 滑动摩擦 能量耗散 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金（51005075）；江西省自然科学基金（2010GQC0034） |
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| Molecular Dynamics Simulation of Sliding Friction Characteristics Between Micro Metal Crystals |
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XIAO Qian, MU Ming, ZHOU Xin–jian
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Key Laboratory of Ministry of Education for Conveyance and Equipment，East China Jiaotong University，Nanchang 330013
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| Abstract: |
| The contact interface potential model was constructed based on energy dissipation mechanism of independent oscillator model and the strong volume effect of metal crystals and the noncontinuous energy dissipation process in the interface friction state was analyzed. A sliding friction coefficient calculation model on smooth dry friction contact plane was proposed. Experiments was also carried out to validate the procedures on the instant atomic locations and system energy. The results indicated that static friction force applied to the surface before contact interface overcome potential barrier. Sliding friction force raised after interface potential over certain value to initiate sliding. Simultaneously, the friction force increased linearly to a certain value, then dropped abruptly in the process. It was found that the temperature of both the moving surface and the substrate surface increased gradually to a stable state with the sliding. However, there was a temperature difference between two surfaces. The average interface contact pressure was found to decrease significantly after the sliding initiated and became stable with the sliding proceeded. |
| Key words: molecular dynamics interface potential energy sliding friction energy dissipation |
