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The H atom may enter the material during production procedures such as welding or electroplating, namely called "internal hydrogen embrittlement" (IHE), or it can enter the material from the surrounding environment during service exposure, known as "environmental hydrogen embrittlement" (EHE) [3–5...
Thus, material property parameters and pipe geometrical imperfections were also implicitly considered. The CSA formula is given by Equation (1). εccrit = 0.5 t D − 0.0025 + 3000 0.5 t D − 0.0025 + 3000 PD 2 2tE 0.4σy 2 E PD 2t ≤ 0.4σy PD 2t ...