Evaluation of Published Data on Ductile Initiation Fracture Toughness of Low-Alloy Structural Steels

1988 ◽  
Vol 16 (2) ◽  
pp. 113 ◽  
Author(s):  
A Wolfenden ◽  
F Ebrahimi ◽  
JA Ali
Keyword(s):  
Fracture Toughness ◽  
Structural Steels ◽  
Published Data ◽  
Initiation Fracture Toughness

Notch-Ductility Transition of Structural Steels of Various Yield Strengths

1972 ◽  
Vol 94 (1) ◽  
pp. 299-305 ◽  
Author(s):  
A. K. Shoemaker
Keyword(s):  
Fracture Toughness ◽  
Brittle Fracture ◽  
Fracture Behavior ◽  
Shear Fracture ◽  
Dynamic Fracture Toughness ◽  
Structural Steels ◽  
Published Data ◽  
Specimen Thickness ◽  
Plastic Energy ◽  
Lateral Contraction

The notch-ductility transition of six structural steels, A36, ABS-Class C, A302-Grade B, HY-80, A517-Grade F, and HY-130, ranging in yield strength from 36 to 137 ksi, was studied with the use of 5/8 and 1 in. dynamic-tear (DT) test specimens. The results were compared with previously published data for V-notch and fatigue-cracked Charpy tests and dynamic fracture-toughness (KID) tests. Energy, lateral-contraction, and fracture-toughness values were compared. The results of this study showed that the full-shear upper energy shelves in the Charpy V-notch and DT specimens are the products of constant average plastic energy densities for each steel and the plastic volume estimates for the fracture of the different specimens. The transition from ductile to brittle fracture behavior is essentially the same in the fatigue-cracked Charpy and DT specimens since, for each steel, the same lateral contraction was measured in each specimen broken at a given temperature. This lateral contraction increased exponentially with temperature until a full-thickness shear fracture developed. However, the maximum lateral contraction increased with increased test-specimen thickness, suggesting that the Kc values corresponding to full-shear fracture should also increase with thickness. Using the proportionality found between the lateral contraction and the values of KID2/σYDE for the brittle-fracture behavior of these steels, the Kc values are estimated to be as much as 4.5 times greater than the KIc values at the same temperatures. In general, the notch-ductility transition can best be quantitatively characterized by the lateral contraction through KID and Kc values, whereas upper shelf energies are related by constant plastic energy densities and plastic volumes which develop during fracture.

Stretch-zone analysis by image processing for the evaluation of initiation fracture toughness of a HSLA steel

2005 ◽  
Vol 96 (8) ◽  
pp. 924-932
Author(s):  
M. Tarafder ◽  
Swati Dey ◽  
S. Sivaprasad ◽  
S. Tarafder ◽  
M. Nasipuri
Keyword(s):  
Image Processing ◽  
Fracture Toughness ◽  
Hsla Steel ◽  
Stretch Zone ◽  
Initiation Fracture Toughness

Effect of desulphurization on the fracture toughness of structural steels at climatic temperatures

1990 ◽  
Vol 22 (11) ◽  
pp. 1569-1577
Author(s):  
A. Yu. Shul'te ◽  
A. V. Prokopenko ◽  
Yu. M. Tomkin ◽  
V. M. Stepkov
Keyword(s):  
Fracture Toughness ◽  
Structural Steels

The influence of mechanical twinning on the fracture toughness of structural steels

1980 ◽  
Vol 15 (5) ◽  
pp. 484-489
Author(s):  
O. N. Romaniv ◽  
A. N. Tkach ◽  
M. F. Zamora ◽  
A. I. Kondyr'
Keyword(s):  
Fracture Toughness ◽  
Structural Steels ◽  
Mechanical Twinning

scholarly journals Effect of the Strain Rate on the Fracture Behaviour of High Pressure Pre-Charged Samples

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1417
Author(s):  
Guillermo Álvarez Díaz ◽  
Tomás Eduardo García Suárez ◽  
Cristina. Rodríguez González ◽  
Francisco Javier Belzunce Varela
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Fracture Behaviour ◽  
Structural Steels ◽  
Gaseous Hydrogen ◽  
Displacement Rate ◽  
Steel Strength ◽  
Fracture Tests

The aim of this work is to study the effect of the displacement rate on the hydrogen embrittlement of two different structural steels grades used in energetic applications. With this purpose, samples were pre-charged with gaseous hydrogen at 19.5 MPa and 450 °C for 21 h. Then, fracture tests of the pre-charged specimens were performed, using different displacement rates. It is showed that the lower is the displacement rate and the largest is the steel strength, the strongest is the reduction of the fracture toughness due to the presence of internal hydrogen.

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