Cleavage Fracture Micromechanisms Related to WPS Effect in RPV Steel

Bordet, S.R.; Tanguy, B.; Bugat, Stéphane; Moinereau, Dominique; Pineau, A.

doi:10.1007/1-4020-4972-2_413

Cited by 2 publications

(4 citation statements)

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“…Based on this theory, the formulation of critical stress is carried out. First, the general form for the elastic component of the critical stress in the fracture test is proposed in Equation (20).…”

Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%

“…Additionally, this function is designed to converge to λω(θ) in the case of a sufficiently high value of ε pl pre , which corresponds to the phenomenon that the parameter of brittle fracture toughness, such as the critical CTOD, converges to a certain low value even if there is a sufficiently high amount of prestrain. ω(θ) is the same function used in Equation (20), which corresponds to how dislocations are moved in the opposite direction. The range where material damage does not progress increases with increasing θ.…”

Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%

“…Finally, the change in critical stress is calculated by combining Equation (20) and Equation (23). The critical stress after prestraining can be determined with Equation (24).…”

Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%

“…Different practical studies combining experiments and numerical analyses reported that the critical stress increased [19], decreased [20], or remained constant [21] after prestraining. Therefore, it is reasonable to assume that the critical stress is affected by prestrain in some way, but the mechanism by which the critical stress is affected under different prestraining conditions has not been clarified because sufficient knowledge has not been obtained.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Estimation of Brittle Fracture Toughness Deterioration in Steel Structures Subjected to Large Complicated Prestrains

et al. 2020

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Studies have suggested that brittle fractures occur in steel because microcracks in the brittle layer at grain boundaries propagate as a result of the increase in piled-up dislocations. Therefore, prestraining can approach the limits of a material, which could lead to a decrease in fracture toughness. However, strains are tensors comprising multiple components, so the effect of prestrain on fracture toughness is not simple. Additionally, the mechanism of change in critical stress due to prestrain has not been thoroughly investigated. For the lifetime evaluation of steel structures with a complicated load history, it is important to generalize the effect of complicated prestrain on the decrease in fracture toughness. In this paper, a single prestrain was applied in a direction different from the crack opening direction. A general three-point bending test was employed for fracture evaluation. Numerical analyses using the strain gradient plasticity (SGP) theory, which is a method based on the finite element method (FEM) are carried out; conventional macroscopic material damage rules are considered as well. Using these FEM analyses, the critical stress is calculated. Finally, the change in critical stress can be expressed by the yield point increase and dislocation density and formulated based on the identified micromechanisms.

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Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%

Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%

“…Finally, the change in critical stress is calculated by combining Equation (20) and Equation (23). The critical stress after prestraining can be determined with Equation (24).…”

Section: Formulation Of Critical Stress Change From Various Prestrainsmentioning

confidence: 99%