Direction Dependent Response of Human Skin

This paper discusses the direction dependent response of human skin under the high speed force impartment with the range of speed of 1 m/s. Under such a dynamic condition, it is well known that human skin deformation can not modeled as a linear system, such as a combination of linear spring, linear damper, and mass. But it has different parameters between the force applying and the recovery phases. By observing the deformation through a high speed camera, we newly found that the direction dependent response comes from the different deformation mechanism between phases.