Abstract
Various proposals have been made for the fracture assessment of pressure vessels under conditions where any failure would involve plastic deformation. In this paper three elasto-plastic fracture mechanics parameters (the J- contour integral, the equivalent energy value and the value of K corrected for plastic zone size) are compared with the Crack Opening Displacement value calculated from mouth-opening measurements on standard notched bar specimens using the method recommended in the British Standard Draft for Development, the work being based on Sumpter's elasto-plastic finite element analysis of a deeply notched bar. The three parameters were found to be roughly equivalent and directly related to the COD. It was also shown that a large volume of fracture toughness data for relatively low strength weld metals conformed with the analysis. Finally, validity limits proposed for J, for K corrected for plastic zone size and for COD were found to be very similar although the reasons for setting these limits differed in each case.
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