International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions
87 Fatigue Crack Growth Behavior of Sealing Rubber Aged in Air and Hydrogen Gas
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To elucidate the effect of aging environment on fatigue crack growth behavior of sealing rubbers, fatigue crack growth tests on unfilled sulfur-vulcanized EPDM rubbers, aged in air or hydrogen atmospheres at temperatures up to 170 °C, were performed in air at room temperature. Acceleration of fatigue crack growth rate was observed in specimens aged in air at 160 °C or higher, and the acceleration increased with increasing aging temperature. Observation of the fatigue fracture surfaces by scanning electron microscope revealed that oxidative-degradation-induced rubber structures were newly formed due to aging, causing the acceleration of fatigue crack growth rate. However, thermal...