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为了解粘着行为的机理,对法向力测量系统进行了改进,利用应变测量和动态应变仪连续采集信号实现对分离力的实时动态测量,理论分辨率达到0.023mN。利用该系统对新鲜解理云母作为接触副的趋近分离实验现象进行了测量,发现新鲜解理云母直接接触时的分离力随着接触次数的增加而减小。在中间层存在水膜时,分离力增加约3倍,这验证了弯月面力对粘着力有显著影响,同时证明系统的动力学特性能够导致突跳现象的发生,且不一定伴随表面的破坏或塑性变形。
In order to understand the mechanism of adhesion behavior, the normal force measurement system was improved, and the real - time dynamic measurement of separation force was achieved by using strain measurement and dynamic strain gauge to acquire signals continuously. The theoretical resolution was 0.023 mN. Using this system, the phenomenon of approaching and separating experiment of fresh cleavage mica as contact pair was measured. It was found that the separation force of fresh cleavage mica decreased with the increase of contact times. The presence of a water film in the middle layer increases the separation force by about a factor of 3, confirming that the meniscus force has a significant effect on the cohesion and that the kinetic properties of the system can lead to kicks and does not necessarily accompany the surface Damage or plastic deformation.