Abstract
Published work on creep crack growth from notches is reviewed briefly, emphasizing the displacement mechanics of the main approaches, i.e. notched-bar creep-rupture tests, stress intensity techniques and net or reference stress methods. Reference stresses are calculated from slip-line theory to estimate the magnitude of creep deformation which occurred in tests reported in the literature. When applied to creep-ductile Cr - Mo - V steels, these reference stresses correlate deformation rates from a complex specimen geometry with strain rates from creep tests on plain bars. Stress intensities, based on linear elastic fracture mechanics, are shown to be inappropriate in much of the earlier work on creep crack growth. It is suggested that future work should include displacement measurements in order to analyse the data.
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