ABSTRACT
Introduction 49 Friction Apparatus 50
Procedure 50 Measurements of the Friction Force 51
Friction Force Measurements of Calibrated Steel Roughness Plate 51
Friction Force of a Silicone 52 In Vivo Measurements of Skin Friction Force 52
Moisturization Effect in Mechanical and Frictional Properties of the Skin 52 Effect in Mechanical Parameters 53 Effect in Static and Dynamic Frictional Properties of the Skin 54
The Skin Friction Model 55 Deformation Component of Friction 56
Conclusions 57 References 57
Previous studies on the tribology of human skin have attempted to demonstrate a correlation between certain tactile sensations and the friction between the skin surface and variety of probes. 1-10 In addition, friction measurements have been used to provide in vivo information about the effects of age, hydration, dermatitis, and cosmetic products I 1-15 on both the interfacial and bulk properties of skin. Most previous studies on the friction of human skin, using sliding probes, have involved torque measurements on disks or flat cones rotating at constant velocity. Typical instruments have employed rotating wheels, oscillating disks, or adapted viscometers.
