繰返し圧縮に対する硬質ゴムの材料定数の同定

抄録

Urethane rubber has high hardness and is often used when it is subjected to compressive load. However, rubber exhibits complex mechanical behavior and it is difficult to treat with the rubber property when rubber products are analyzed. Therefore, in this study, a compression test of urethane rubber was performed with different stroke rates. The experimental method was carried out according to JIS K 6254. The diameter of specimen was 29 mm, and the height was 12.5 mm. The specimen was compressed at a constant stroke rate until the stroke is 3.75 mm. Then it began to return the stroke to 0 mm at the same stroke rate. This procedure was repeated 4 times. And in consideration of hyperelasticity, viscoelasticity, Mullins effect, friction, appropriate material parameters were searched by using Nelder-Mead method. As a result of the analysis, there was a tendency that as the particular material parameter increased as the stroke rate increased, but the associated material parameter decreased. And as for the viscoelasticity parameter, as the stroke rate increased, the delay time changed significantly.