Influence of Surface Feature Height of Deterministic Texture on Tactile Perception of Fingertip

In order to reveal the basic mechanism and law of the tactile perception of human body, first of all, the influences of the surface feature height of deterministic texture on the fingertip skin friction behavior were studied through friction and wear analysis in mechanical physics. Secondly, by means of psychological test, the latent period and amplitude of P300, a cognitive component related to the friction behavior, were obtained. Finally, combining the test results of both, the relationship between skin friction behavior of fingertips and tactile perception was studied. The results show that the friction force is mainly composed of adhesive friction, hysteresis friction and interlock force when the finger skin is in contact with the deterministic texture surface with large roughness. There is a strong correlation between the tactile perception of finger skin and the friction effect. When the surface texture increase from 0.1 to 0.4, the skin deformation of fingertips increase from 2.356 to 2.941, the hysteresis friction and inter locking effect caused by skin deformation of fingers become more obvious. The samples with large texture feature height induce P300 with small latency, large peak and obvious perception, while the samples with small texture feature height are the opposite, which indicate that skin friction perception mainly depend on the hysteresis friction and interlocking effects directly related to skin deformation.