Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
The external force from a mattress to the body surface consists of compressive force component and shear force component. Though the mechanical response of the mattresses to the pressure has been studied widely, the response to the shear needs to be studied more deeply. In this study, a device to measure compression and shear forces of mattresses was developed by using the previously developed device in our laboratory, a 3-axis force sensor and vertical and horizontal stages. The present device is controlled by applying displacement while the previously developed one is controlled by applying the horizontal stretch manually after applying a vertical load. By applying a vertical and subsequent horizontal displacement on gel-like mats with a spherical surface object, a linear force-displacement relationship in the horizontal direction was obtained at first and a slip motion with almost constant load later. By conducting finite element analysis, the changes of vertical and horizontal forces under shear was reproduced with a constant friction coefficient.
