接触模型与摩擦力分子分量的评估

V. Tikhomirov, M. Shalygin, M. Izmerov
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引用次数: 0

摘要

根据测量尺度的高低,摩擦力的性质发生变化,由不同的依赖关系决定。本文提出了一种确定摩擦力分子组分的方法,该方法是基于具有钢样品的氮化硅悬臂针在弹性相互作用下分子链的比剪切阻力的评估,用于在纳米范围内用原子力显微镜(AFM)«FemtoScan»在低载荷下扫描样品表面的一部分。原子力显微镜的敏感元件(测量装置)作为力传感器,用于测量两个方面:非常粗略的正常载荷,以及在已知刚度下施加在悬臂上的力的变化,包括悬臂杆形式变化的值。它还改变了敏感元件上的负载(为了评估摩擦力的分子成分,选择了“最光滑”表面本身的路线)。本文还提供了基于赫兹理论的纳米尺度悬臂针的接触相互作用参数的分析评估,该参数表示为球形压头,具有弹性半空间作为研究表面。对所研究表面扫描过程中压头阻力测量的计算和实验数据进行了分析,结果收敛性较好,与实验数据的偶值偏差不超过7.5%。利用所建立的公式计算表明,在纳米尺度下,随着接触载荷的增加,接触点在弹性状态下的增长速度更快(前提是与亚粗糙度相关的不等式角保持不变),摩擦系数减小,这在实验过程中也得到了证实。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Contact model and evaluation of friction force molecular component
According to the level of the measurement scale, the friction force changes its nature and is determined by different depend-encies. The paper views a procedure for determining a friction force molecular component based on the evaluation of specif-ic shearing resistance of molecular links un-der the elastic interaction of a silicon nitride cantilever needle having a steel sample, used for scanning a section of a sample surface in the nanometer range with an atomic force microscope (AFM) «FemtoScan» under low loads. A sensitive element (measuring device) of an atomic force microscope acts as a force sensor for measuring both: a normal load very roughly, and a change in the force, applied to the cantilever under known stiffness, including the value of the cantilever rod form alteration. It also changes the load on the sensitive element (to assess the mo-lecular component of the friction force, the route of the «smoothest» surface itself was chosen). The paper also provides an analytical assessment of the contact interaction parameters of a cantilever needle in a nano-scale, rep-resented as a spheri-cal indenter, with an elastic half-space as a surface under study, based on the Hertz theory. Analysis of the calculation and experiment data on measuring the resistance force of the indenter during scanning of the surface under study, showed good convergence of the results with a deviation of even values from the experimental data of no more than 7,5 %. Calculations using the established formulas showed that with an increase in the load on the contact at the nanoscale, the coefficient of friction decreases due to a faster growth of contact spots in the elastic state (provided that angularity of inequalities related to sub-roughness remains constant), which was also confirmed in the course of the experiment.
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