Non-Destructive characterization of hydrogen-embrittlement cracking by acoustic emission techniques

摘要: Abstract Acoustic emission techniques are used to determine the rate of cracking high-strength steel due hydrogen embrittlement, making it possible predict failure in certain structural components undergoing attack. The acoustic from a hydrogen-charged, linear-compliance, fracture-toughness specimen 4340 was recorded as function stress-intensity factor at crack tip specimen. component (a hydrogen-charged boh same material) then torqued down simple fixture and time. obtained near-critical value within ±15 per cent time for onset unstable bolt most significant result this investigation is that regardless initial loading, nucteatkm begin, or any other factors connected with geometrical differences specimens, can be stress intensity rapid fracture.