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Chen, J.H.; Wang, H.J.; Wang, G.Z.; Zhang, Dong; Chen, X.

doi:10.1023/a:1022251128300

Cited by 10 publications

(2 citation statements)

References 12 publications

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“…The minimum value of 787 MPa for FG in Table VIII, corresponding to a value of 0.075 of pc , maybe is slightly higher than the real value but does not affect the analyses. In our previous work, [9,10] it was found that a prestrain up to 20 pct did not affect the values of the local fracture stress s f . In Sections A-1 through 5, 600 and 800 MPa are adopted as s f for CG and FG, respectively.…”

Section: B Analyses Of Fluctuation Of Syycmentioning

confidence: 86%

“…(2) In the authors' work investigating the effects of warm prestressing on the apparent toughness of high-strength low-alloy steel, it was found that the local fracture stress s f was not affected by the prestressing up to yielding. [9,10] Some questions remain regarding the effects of prestrain as well as the mechanism controlling fracture under such conditions. This work focuses on the effects of tensile prestrain on the notch toughness of deliberately coarsened low-alloy steel and the mechanism of these effects from the viewpoint of changes of the critical event for cleavage fracture.…”

Section: Introductionmentioning

confidence: 99%

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Effects of tensile prestrain on the notch toughness of low-alloy steel

Chen

Wang

2003

Metall Mater Trans A

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Tensile prestrains of various levels were applied to blank steel specimens. Four-point bend tests of notched specimens at various temperatures revealed an appreciable drop in the notch toughness of the specimens, which experienced 3 pct tensile prestrain. Further prestrains of up to 20 pct had a negligible effect on the notch toughness despite additional increases in the yield strength. Microscopic analyses combined with finite element method (FEM) calculations revealed that the decrease in toughness resulted from a change of the critical event controlling the cleavage fracture. The increase in yield strength provided by prestraining allowed the normal tensile stress at the notch tip to exceed the local fracture stress s f for propagating a just-nucleated microcrack. As a result, for the coarsegrained steel with low s f tested presently, the critical event was changed from tensile stress-controlled propagation of a nucleated microcrack to plastic strain-controlled nucleation of the microcrack at the notch tip. A reduction of toughness was induced as a result of this. The increase in yield strength provided by decreasing the test temperature acted in the same way.

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Section: B Analyses Of Fluctuation Of Syycmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%