ウレタンフォームマットに挿入された合成ゴム層のせん断変形特性の測定

抄録

Pressure ulcer occurs by prolonged external force on bone prominence. The external force consists of compressive force and shear force. Many studies have been done for the effect of the compressive force because this is a primary cause of pressure ulcer. The effect of shear force has also been studied as a combination with the compressive force. The purpose of this study is to evaluate the shear deformation behavior of a layer of synthetic rubber, which is a gel-like material, in a mat with a polyurethane foam layer. Monotonic and cyclic shear were applied to the rubber material with a constant compressive strain. Under the cyclic shear and a constant compressive strain, stable hysteresis loops were obtained. The mean shear modulus was about 1 kPa which was close to the reported value in the literature. The mat with the polyurethane foam obtained a low resistance to shear with an addition of a synthetic rubber layer.