SA-08-3(069) Failure mechanism in Carbon Manganese steel at 360℃ under multiaxial stress states(Flaw Progress & Failure Mechanism 1)

概要

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Different batches of carbon manganese were tested at 360℃, in which their extent of free nitrogen content and creep failure ductilities differed. The comparison of creep rupture life of notched bar tests with plain bar creep tests of carbon-manganese (C-Mn) material are presented in terms of a representative stress criteria. The stress rupture behaviour in the notched bars are determined by a combination of the effective stress and the maximum principal stress at a numerically determined skeletal point across the notch cross section. Notch strengthening in terms of net-section stress, over plain bar creep results, is present for all notches. It has been found that for the materials regarded as high free nitrogen, the sharp notched specimens fail fastest followed by the medium and blunt notches. Comparison between the low free nitrogen with the high free nitrogen batches shows that failure in the former is primarily equivalent stress controlled whilst fracture in the latter is by crack initiation and principal stress controlled.
一般社団法人日本機械学会の論文
2001-06-03