Estimation of Hydrogen Embrittlement Process by Statistical Analysis of Fracture Time

Abstract

It may be possible to estimate the hydrogen embrittlement process by statistically analyzing the fracture time of high strength steel. In this study, we derived transition probability λ（t） representing the degradation rate by statistically analyzing the fracture time of high strength steel using a stochastic process model. The analysis revealed that λ（t） decreased rapidly after the start of the test and then became a constant value. This behavior differs from general hydrogen entry behavior, suggesting that the fracture time of high strength steel is not uniquely determined only by the amount of hydrogen in the specimen.