STUDIES ON THE MECHANICAL PROPERTIES OF THE CURING GUM IN THE PREVENTION OF VIBRATION

방진효과에 미치는 가류고무의 기계적성질에 관한 연구

The major subjects of this experiment are to evaluate the mechanical properties of the curing gum for prevention of vibration and to study for related problems. In the prevention of vibration by the curing gum, the results are as follows. When the value of forced frequency over natural frequency is less than $\sqrt{2}$, it may well be used that the value$(1\%-2\%,\;4\%-5\%)$ of damping coefficient over critical damping coefficient of the curing gum is large. When the value of forced frequency over natural frequency is larger than $\sqrt{2}$, it may well be used that the value $(2.5\%-3.5\%)$ of the curing gum is low. If the larger value of logarithmic decrement may be used, the low curing gum is preferred. The conductive range of sulphur contents of the curing gum is $3.3\%-3.5\%$ in the light of phase angle, resilience, and damping coefficient over critical damping coefficient.

1. 진동방지에는 $W/W_n<\sqrt{2}$일 때는 $C/_cC$가 큰 유화고무$(1\~2\%,\;4\~5\%)$가 좋다. 2. $W/W_n<\sqrt{2}$ 일때는 $C/_cC$가 작은 유화고무$(2.5\%\~3.5\%)$가 좋다. 3. 대수감쇠율의 값을 크게 하려면 저유화 고무가 좋다. 4. $\phi$ 및 R, $C/_cC$를 감안해서 $2.5\%\~3.5\%$의 유화 고무가 좋다. 5. $5\%이상$의 유화고무는 과유화관계상 좋지 못하다.