動的疲労による短繊維-ゴム複合体の応力と表面温度

抄録

The change in stress and surface temperature of short fiber-rubber composites under a repeated constant displacement were measured. The fatigue test was carried out in the direction of fiber orientation of composite with 5% of static strain and ±2.5% of sinusoidal strain under 5 and 25Hz. By giving intermission repose at the mid of the fatigue test, the effect of duration of intermission and fatigue cycles until intermission on change in the stress and surface temperature was investigated.
Under the condition of high sinusoidal strain rate, the interfacial region between fibers and rubber matrix giving rapid displacement is destroyed and the internal heat generation is large. Consequently, the stress decreases radically and the surface temperature rises till the slip of the short fibers takes place by the destruction of the interfacial region. It seems that the stress decay of composite was caused by the destruction of interfacial region and the internal heat generation from the results of measuring stress and surface temperature before and after duration of intermission under discontinuous fatigue test. The composite shows the recovery of the strain including the interfacial region between fibers and rubber matrix when the duration of intermission is applied before the slippage of the short fibers.