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| 1 | 二维材料纳米尺度摩擦行为及其机制显示文摘二维材料是指厚度仅有单层或数层原子的晶体或非晶材料,其优异的物理、力学和化学性能给纳米尺度超薄固体润滑材料的设计和发展带来了新的契机.同时,二维材料独特而简单的拓扑结构也为深入了解摩擦的微观机制提供了一个理想的对象.论文综述了以石墨烯为主的二维材料纳米尺度摩擦和磨损研究的进展.根据相对运动形式的不同,分别介绍了二维材料的层间滑动和表面摩擦行为,并详细阐述了这些独特行为背后的微观物理机制;同时还重点介绍了若干种影响和调控二维材料表面摩擦性能的典型方法和策略,以及二维材料纳米尺度的磨损行为及其失效模式.最后,还对纳米尺度二维材料摩擦研究进行了小结,并展望了该领域尚待探索的若干研究方向. | 李群仰 张帅 祁一洲 姚泉舟 黄月华 | 2017 | 固体力学学报2017，38，3： | 8 |
| 2 | A universal method to calculate the surface energy density of spherical surfaces in crystals显示文摘Surface energy plays an important role in the mechanical performance of nanomaterials; however, determining the surface energy density of curved surfaces remains a challenge. In this paper, we conduct atomic simulations to calculate the surface energy density of spherical surfaces in various crystalline metals. It is found that the average surface energy density of spherical surfaces remains almost constant once its radius exceeds 5 nm. Then, using a geometrical analysis and the scaling law, we develop an analytical approach to estimate the surface energy density of spherical surfaces through that of planar surfaces. The theoretical prediction agrees well with the direct atomic simulations, and thus provides a simple and general method to calculate the surface energy density in crystals. | Jian Wang Jianjun Bian Xinrui Niu Gangfeng Wang | 2017 | Acta Mechanica Sinica2017，33，1： | 1 |
| 3 | Statistical Characterization of the Yield Stress of Nanoparticles显示文摘Atomistic simulations are performed to study the statistical mechanical properties of gold nanoparticles.It is demonstrated that the yielding behavior of gold nanoparticles is governed by the dislocation nucleation around surface steps.Since the nucleation of dislocation is an activated process with the aid of thermal fluctuation,the yield stress at a specific temperature should vary statistically rather than being a definite constant value.Molecular dynamics simulations reveal that the yield stress follows a Gaussian distribution at a specific temperature.As the temperature increases,the mean value of yield stress decreases while the width of distribution becomes larger.Based on the numerical analysis,the dependence of mean yield stress on temperature can be well described by a parabolic function.This study illuminates the statistical features of the yielding behavior of nanostructured elements. | Liang Yang Jianjun Bian Weike Yuan Gangfeng Wang | 2021 | Acta Mechanica Solida Sinica2021，34，2： | 0 |
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