Abstract
The complicated driving force at the stress corrosion cracking (SCC) tip of the safe-end dissimilar metal-welded joints (DMWJs) in the pressurized water reactor (PWR) is mainly caused by the heterogeneous material mechanical properties. In this research, to accurately evaluate the crack driving force at the SCC in DMWJs, the stress-strain condition, stress triaxiality, and J-integral of the crack tip at different positions are analyzed based on the heterogeneous material properties model. The results indicate that the larger driving force will be provided for the I-type crack when the crack is in the SA508 zone and the interface between the 316L region and base metal. In addition, the heterogeneous material properties inhibit the J-integral of the crack in the 316L region, which has a promoting effect when the crack is in the SA508 zone and weld metal. It provides a new idea for analyzing driving force at the crack tip and safety evaluation of DMWJs in PWRs.
Highlights
stress corrosion cracking (SCC) [16, 17]
It can be seen that the contour around the crack tip of the noninterface presents a slight asymmetric distribution along both sides of the crack due to heterogeneous material properties of the Alloy 52M dissimilar metal-welded joints (DMWJs). e field area of the Mises stress around the crack tip in the weld metal is significantly smaller than that of the base metal under the same external load conditions
It indicates that the heterogeneous mechanical properties distribution of the Alloy 52M DMWJ does not cause the uneven distribution of the stress state at the crack tip of the noninterface crack. e crack tip stress value of crack 1 in the SA508 zone is larger than that of the other three cracks, which shows that larger tensile stress will be obtained at the crack tip of the SA508 zone when the tensile load is kept constant
Summary
E Ramberg–Osgood (R–O) equation can be adapted to express the material constitutive models of the DMWJ in PWRs [18], which is written as εσ σn. Σ0 where σ0 is the yield strength, ε0 is the yield strain, α is the coefficient of Ramberg–Osgood, and n is the work hardening exponent. Many material constitutive models have been provided to users in ABAQUS, but they are only adopted to. Material Young’s modulus, E (MPa) Poisson ratio, v Yield stress, ε0 (MPa) Work hardening exponent, n Hardening parameter, α
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