CAJ | 학술논문

采用分子动力学模拟的方法研究了硅针尖在金刚石基底滑动的黏滑现象,讨论了纳米尺度下温度、滑动速度、载荷等因素对黏滑摩擦的影响.模拟结果表明,在纳米尺度下,原子排列规则的两固体间的滑动摩擦力呈现出周期性的锯齿型变化.摩擦力曲线的波动周期取决于滑动过程中基体沿滑动方向的晶格常数,同时受接触面原子排列结构变化的影响.在较低温度范围内,滑动摩擦力随温度的升高近似呈线性减小,对滑动摩擦力的波动周期和振幅影响不大.在一定速度范围内,滑动摩擦力主要受黏着作用的影响,滑动摩擦力的大小随速度的增大近似呈线性增大.在一定载荷范围内,滑动摩擦力随载荷的增大近似呈线性增大,振动周期变大.
채용분자동역학모의적방법연구료규침첨재금강석기저활동적점활현상,토론료납미척도하온도、활동속도、재하등인소대점활마찰적영향.모의결과표명,재납미척도하,원자배렬규칙적량고체간적활동마찰력정현출주기성적거치형변화.마찰력곡선적파동주기취결우활동과정중기체연활동방향적정격상수,동시수접촉면원자배렬결구변화적영향.재교저온도범위내,활동마찰력수온도적승고근사정선성감소,대활동마찰력적파동주기화진폭영향불대.재일정속도범위내,활동마찰력주요수점착작용적영향,활동마찰력적대소수속도적증대근사정선성증대.재일정재하범위내,활동마찰력수재하적증대근사정선성증대,진동주기변대.
Molecular dynamics (MD) simulation of nanoscale stick-slip phenomena was performed for a silicon tip in contact with the diamond substrate. The influence of sliding velocity, normal force and temperature on the stick-slip at the nanoscale was analyzed. It is found that the regular ar-rangement of the atoms on the sliding surface induces a periodic sawtooth-like behavior in the friction curve. The period of the "sawtooth" depends on the lattice constant of the substrate along the sliding direction, and it is affected by the positions of atomic rows. In lower temperature range the sliding friction approximately linearly decreases with the increase of temperature, while the period and am-plitude are little affected by the temperature. For a certain extent of velocity the sliding friction ap-proximately linearly increases with sliding velocity due to the adhesive action. In certain range of nor-mal force the sliding friction approximately linearly increases with the increase of normal force, meanwhile the vibration period of the sliding friction becomes larger.