Abstract In R6 and R5, the standards of integrity assessments of components containing defects established by the former Central Electricity Generating Board (C EGB ) in the UK, the basic procedure in calculating the crack driving force parameters, J -integration and C *-integration is to define the reference stress, σ ref , on the defective section. Three methods of directly defining the reference stress, σ ref [multiple steady-state creep analysis (M SCA ) method, creep module-modified iteration (C MMI ) method and elastic module-modified iteration (E MMI ) method], are suggested in this paper, differing from the common methods in which the limit loads of the components are first calculated and then the σ ref is convertibly determined. The basic conceptions and calculational steps of these methods are discussed and compared in the context, and the validity is demonstrated by several examples.
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