Evaluating energy dissipation mechanisms of friction on clean surfaces

接触表面的总能量不随滑动距离Q而变化，从而导致摩擦力消失。另一方面，界面相互作用的增加导致组成原子的不连续运动，导致摩擦的出现。因此，我们看到由于界面相互作用的增加，摩擦力从消失变为有限。这就是摩擦转变。用成对原子间相互作用势推导了各种金属间化合物体系中摩擦转变发生的条件，从而考察了摩擦转变的发生。对W(011)尖端与Si(001)清洁表面的摩擦系统进行了相关实验，得出摩擦系统没有发生摩擦转变的结论。本研究通过考虑多体原子间相互作用势，从理论上阐明了摩擦系统中是否存在摩擦相变。

The total energy of contacting surfaces is invariant for sliding distance Q, resulting in vanishing frictional force. The increase in interfacial interactions, on the other hand, leads to the discontinuous motion of constituent atoms, resulting in the appearance of friction. We, thus, see the frictional force changes from vanishing to finite due to increased interfacial interactions. This is called friction transition. It has been examined that the occurrence of the friction transition by deriving its condition in various inter-metallic systems by using pair-wise inter-atomic potentials. The related experiment has been done for the frictional system of W(011) tips and Si(001) clean surfaces, and it has been conclude that the friction transition has not occurred in the frictional system. This study theoretically has clarified whether or not the friction transition occurs in the frictional systems by taking into account of many-body inter-atomic potentials.