Computational modeling microstructural fracture processes in A533B pressure vessel steel. Final report

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Abstract
Microstructural fracture processes in A533B steel were studied in small standard tensile test specimens, and a computational model of these processes was constructed to allow calculation of various measures of macroscopic fracture toughness. Based on data from small smooth-bar tensile tests, computations were made of J/sub Ic/, the critical crack-opening angle, and the critical crack-opening displacement for a hypothetical center-cracked-panel large enough to fulfill the conditions for J-controlled growth. The calculated values of these parameters only slightly exceeded values typically measured. It is concluded that a viable route exists to obtain macroscopic fracture toughness measures from posttest metallographic examination of small tensile specimens. The resulting computational model can also be used to compute the conditions for failure under conditions of large-scale yielding, in the absence of macroscopic cracks, and to study expected variations in toughness caused by variations in inclusion concentrations.

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