Abstract
Due to exposure of high-pressure hydrogen gas to a sealing rubber material, such as an O-ing, internal cracks sometimes occur by decompression, and consequently cause serious leakage of the hydrogen gas. Therefore, it is important to detect the internal cracks in an early stage of fracture. From this viewpoint, an acoustic emission (AE) method was applied in order to detect internal fracture of the sealing rubber material by high-pressure hydrogen decompression. According to preliminary tests, while AE signals were hardly detected at a tensile test in air, those were detected at a static crack growth test in air. This result implies that the AE signals are mainly generated during crack initiation and growth. The AE measurement of hydrogen-exposed specimens was also conducted. Internal cracks of the hydrogen-exposed specimens can be detected by the AE method. When crack damage became more serious, the count and amplitude of the AE signals increased.
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