Abstract
Storage tanks and pipelines for transporting gaseous fuel are considered to be used in low temperature environment. Cryogenic brittlement and hydrogen brittlement are possible to accrue one upon another for materials used in such infrastructures. In this study, the finite element analyses for the fracture experiments of hydrogen charged and non-charged materials of welded material of COR-TEN O are carried out and Crack Energy Density is evaluated as a fracture parameter. Based on the evaluation results, the variation of fracture resistance under low temperature is shown, comparing brittle-ductile transition observed on the experiments. Also, through the observation of fracture surface by SEM photographs, the effect of hydrogen on the brittle-ductile transition and the variations of fracture resistance is discussed.
