Zhou Hongjian, Li Jiejie, Xian Yuehui, Hu Guoming, Li Xiaoyong, Xia Re
Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan 430072, China.
Hubei Key Laboratory of Waterjet Theory and New Technology (Wuhan Unijversity), Wuhan 430072, China.
Nanomaterials (Basel). 2018 Oct 4;8(10):785. doi: 10.3390/nano8100785.
A bearing is an important component in contemporary machinery and equipment, whose main function is to support the mechanical rotator, reduce the friction coefficient during its movement, and guarantee the turning accuracy. However, assembly of a nanoscale bearing and sleeve is a challenging process for micro-nano mechanical manufacturers. Hence, we show the cold-welding mechanism of a copper nanobearing-nanosleeve via molecular dynamic simulations. We demonstrate that it is feasible to assemble a bearing and sleeve at the nanoscale to form a stable mechanism. The effect of temperature in the range of 150 to 750 K is investigated. As the temperature rises, the mechanical strength and the weld stress of the welded structures markedly decrease, accompanied by the observation of increasing disorder magnitude. This comparison study is believed to facilitate future mechanical processing and structural nano-assembly of metallic elements for better mechanical performance.
轴承是当代机械设备中的重要部件，其主要功能是支撑机械旋转体，降低其运动过程中的摩擦系数，并保证转动精度。然而，对于微纳机械制造商来说，纳米级轴承与轴套的装配是一个具有挑战性的过程。因此，我们通过分子动力学模拟展示了铜纳米轴承 - 纳米轴套的冷焊机制。我们证明了在纳米尺度上装配轴承和轴套以形成稳定机构是可行的。研究了150至750 K范围内温度的影响。随着温度升高，焊接结构的机械强度和焊接应力显著降低，同时观察到无序程度增加。这项对比研究相信将有助于未来金属元素的机械加工和结构纳米装配，以获得更好的机械性能。
