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首页> 外文期刊>RSC Advances >Movement patterns of ellipsoidal particles with different axial ratios in three-body abrasion of monocrystalline copper: a large scale molecular dynamics study
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Movement patterns of ellipsoidal particles with different axial ratios in three-body abrasion of monocrystalline copper: a large scale molecular dynamics study

机译：单轴铜三体磨损中不同轴向比率的椭球颗粒的运动方式：大规模分子动力学研究

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In three-body abrasion, the abrasive particle shape has a major impact on the movement patterns. These consist of sliding or rolling relative to the abraded surfaces. It has been recognized that the movement patterns of the particles dominate the wear mechanism of the materials in three-body abrasion. In this paper, the movement patterns of monocrystalline diamond ellipsoidal particles, which are sandwiched between monocrystalline copper workpieces, were investigated by large-scale molecular dynamics (MD). During the simulations, the axial ratio of the ellipsoidal particle varied from 0.90 (an approximate sphere) to 0.50 (a flattened ellipsoid). It has been found that there is a transition of the movement patterns between rolling and sliding. The particle slides when the axial ratio is smaller than 0.83, and it rolls when the axial ratio is larger than 0.83. Normal load and friction force curves were also obtained relative to the wear time. It has been shown that the average friction coefficient of rolling particles is lower than that of sliding particles. If the ratio of two-moment arms, such as the driving and resistant force moment arms of the particle, is defined as e/h, the curves for the friction coefficient and value e/h can determine the movement patterns of particles at the nanoscale, the same as at the macroscale. When the friction coefficient is higher than e/h, rolling of the particle occurs, whereas the particle slides if the friction coefficient is smaller than e/h. By comparing with macroscale three-body abrasion, a particle at the nanoscale has a strong tendency to roll because of its significant elastic recovery. When the particle rolls, the defect depth, groove depth and dislocation length are all increased relative to particle sliding, resulting in more severe subsurface defects of the monocrystalline copper.
机译：在三体磨损中，磨粒形状对运动方式有重要影响。这些包括相对于研磨表面的滑动或滚动。已经认识到，颗粒的运动方式在三体磨损中支配了材料的磨损机理。本文通过大规模分子动力学研究了夹在单晶铜工件之间的单晶金刚石椭球颗粒的运动模式。在模拟过程中，椭圆形粒子的轴向比率从0.90（近似球形）到0.50（扁平椭圆形）变化。已经发现，运动模式在滚动和滑动之间存在过渡。当轴向比小于0.83时，颗粒滑动，而当轴向比大于0.83时，颗粒滚动。还获得了相对于磨损时间的法向载荷和摩擦力曲线。已经表明，滚动颗粒的平均摩擦系数低于滑动颗粒的平均摩擦系数。如果将两个矩臂的比例（例如粒子的驱动力和阻力力矩臂的比例）定义为 e / h ，则摩擦系数曲线和 e / h 值可以确定纳米级粒子的运动模式，与宏观级相同。当摩擦系数大于 e / h 时，粒子发生滚动，而如果摩擦系数小于 e 则粒子滑动。 / h 。通过与宏观三体磨损进行比较，纳米级颗粒由于其显着的弹性回复而具有很强的滚动趋势。当颗粒滚动时，缺陷深度，凹槽深度和位错长度都相对于颗粒滑动而增加，从而导致单晶铜的更严重的表面缺陷。

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