Effect of Surface Energy on Shearing of Metal Asperities Contact at the Nanoscale,The Journal of Physical Chemistry C

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Effect of Surface Energy on Shearing of Metal Asperities Contact at the Nanoscale
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-12-03 , DOI: 10.1021/acs.jpcc.0c06371
Danyang Yu _{1,

2} , Jin Wang ₃ , Ming Ma _{1,

2,

3} , Yonggang Meng _{1,

2}

Affiliation

In the long history of study on friction and wear phenomena, the single asperity system (SAS) is found to be the primary unit to understanding the macroscopic mechanisms. Despite of the importance, existing experimental and simulation techniques are difficult to give a unified understanding on this complex multi-scale phenomenon. Here, we study the shearing of the SAS by using full atomic molecular dynamics simulations. The result agrees quantitatively with the existing experimental measurements. Then, a detailed analysis from the energy perspective is performed to reveal the underlying physical mechanism of the SAS friction process. Results show that surface energy γ of the SAS plays an important role on its tribology behavior at the nanoscale. Our results point out the deficiency of the adhesion friction theory at the nanoscale, providing insights in the origin of friction and wear and benefit its implications on macroscopic tribological problems.

中文翻译：

表面能对纳米级金属粗糙接触剪切的影响

在研究摩擦和磨损现象的悠久历史中，单一粗糙系统（SAS）被认为是理解宏观机理的主要单元。尽管很重要，但是现有的实验和模拟技术很难对这种复杂的多尺度现象给出统一的理解。在这里，我们通过使用完整的原子分子动力学模拟研究SAS的剪切。结果在数量上与现有的实验测量结果吻合。然后，从能量的角度进行了详细的分析，以揭示SAS摩擦过程的潜在物理机制。结果表明，SAS的表面能γ在纳米级的摩擦学行为中起着重要作用。我们的结果指出了纳米尺度上粘附摩擦理论的不足，

更新日期：2020-12-17

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