Two component description of ductile to brittle transition in ferritic steel

Ortner, Susan; Hippsley, C. A.

doi:10.1179/026708396790122053

Cited by 20 publications

(28 citation statements)

References 10 publications

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“…This method produces an estimate of r u as a function of temperature throughout the DBT with a direct calibration at only one temperature, most likely the testing temperature adopted to establish T 0 . However, some studies argue that r u is temperature independent [17][18][19][20]. Hence, calibration of the Beremin model and the variation of the Weibull stress parameter, namely r u and m in the DBT region are worthy to be studied.…”

Section: Introductionmentioning

confidence: 99%

Calibration of Beremin model with the Master Curve

Qian

González-Albuixech

Niffenegger

2015

Engineering Fracture Mechanics

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Section: Introductionmentioning

confidence: 99%

Calibration of Beremin model with the Master Curve

Qian

González-Albuixech

Niffenegger

2015

Engineering Fracture Mechanics

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“…[15] Odette et al [13] explained the MC using a microscopic fracture stress varying with temperature. Most experimental findings [7,8] indicate that the fracture stress is not sensitive to temperature; more careful experiments and simulations may be required to resolve this issue.…”

Section: Introductionmentioning

confidence: 94%

“…However, the examination of the fracture surface reveals that cracks propagate predominantly by cleavage; [4] (2) several cracked, brittle particles are found to be present in the broken samples; [5,7] and (3) the measured microscopic fracture stress (at microcracks) is found to be a few orders of magnitude higher than that of the pure Griffith value. [7,8] All these observations are considered in our model, as follows.…”

Section: A Problem Formulationmentioning

confidence: 99%

“…Another observation, though less ambiguously established, is that the cleavage stress at fracture on these microcracks is invariant with temperature. [4][5][6][7][8] Ritchie, Knott, and Rice [9] used both the solutions developed by Hutchinson-Rice and Rosengren and a finite element analysis (FEA) to simulate the plastic zone; a critical tensile stress achieved over a characteristic distance ahead of the crack is used as the failure criterion. This distance is essentially a fitting parameter, and Ritchie, Knott, and Rice used a value equal to or twice the average grain diameter.…”

Section: Introductionmentioning

confidence: 99%

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Dislocation simulation of brittle-ductile transition in ferritic steels

Noronha

Ghoniem

2006

Metall Mater Trans A

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Two-dimensional discrete dislocation simulations of the crack-tip plasticity of a macrocrack-microcrack system representing the fracture behavior in ferritic steels are presented. The crack-tip plastic zones are represented as arrays of discrete dislocations emitted from crack-tip sources and equilibrated against the friction stress. The dislocation arrays modify the elastic field of the crack; the resulting field describes the elastoplastic crack field. The simulated crack system involves a microcrack in the plastic zone of the macrocrack (elastoplastic stress field). The effects of the crack-tip blunting of the macrocrack are included in the simulations; as dislocations are emitted, the microcrack is kept at a constant distance from the blunted tip of the macrocrack. The brittle-ductile transition (BDT) curve is obtained by simulating the fracture toughness at various temperatures. A consideration of the effects of blunting is found to be critical in predicting the sharp upturn of the BDT curve. The obtained results are compared with existing experimental data and are found to be in reasonable agreement.

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“…For A533B steels, it was found that the local stress σ f is about 1955 MPa [9,13]. On the other hand, the characteristic distance, r c , is more sensitive to the temperature variation [14].…”

Section: Determination Of Characteristic Distance (R C )mentioning

confidence: 99%

Prediction of Characteristic Length and Fracture Toughness in Ductile-Brittle Transition

Wang

Chao

et al. 2008

Volume 6: Materials and Fabrication, Parts a and B

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Finite element method was used to analyze the three-point bend experimental data of A533B-1 pressure vessel steel obtained by Sherry, Lidbury, and Beardsmore [1] from -160 to -45 °C within the ductile-brittle transition regime. As many researchers have shown, the failure stress (σ f ) of the material could be approximated as a constant. The characteristic length, or the critical distance (r c ) from the crack tip, at which σ f is reached, is shown to be temperature dependent based on the crack tip stress field calculated by the finite element method. With the J-A 2 two-parameter constraint theory in fracture mechanics, the fracture toughness (J C or K JC ) can be expressed as a function of the constraint level (A 2 ) and the critical distance r c . This relationship is used to predict the fracture toughness of A533B-1 in the ductile-brittle transition regime with a constant σ f and a set of temperature-dependent r c . It can be shown that the prediction agrees well with the test data for wide range of constraint levels from shallow cracks (a/W= 0.075) to deep cracks (a/W= 0.5), where a is the crack length and W is the specimen width.

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Two component description of ductile to brittle transition in ferritic steel

Cited by 20 publications

References 10 publications

Calibration of Beremin model with the Master Curve

Calibration of Beremin model with the Master Curve

Dislocation simulation of brittle-ductile transition in ferritic steels

Prediction of Characteristic Length and Fracture Toughness in Ductile-Brittle Transition

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