Threshold fracture stress: theory and application

Котречко, С. А.; Zatsarna, Oleksandra; Kozák, Vladislav; Dlouhý, Ivo

doi:10.1016/j.prostr.2020.01.122

Cited by 3 publications

(3 citation statements)

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“…Chemical composition of the steels is presented in Table 1 . More details on materials used can be found in our previous works, e.g., [ 17 , 24 , 25 ]. Both steels were investigated as received and had a ferritic structure.…”

Section: Methodsmentioning

confidence: 99%

“…It consists of the development of a technique for the experimental determination of

. Therefore, a simplified method for determining

for structural steels was proposed [ 17 ]. According to this technique, the value of

is determined based on the results of uniaxial tensile tests of 5–6 notched cylindrical specimens with special geometries (maximum diameter is 5 mm; minimum notched diameter is 5.2 mm; notch radius is 2 mm) at the boiling point of liquid nitrogen (−196 °C).…”

Section: Introductionmentioning

confidence: 99%

“…Here, in this contribution, the authors emphasised the need to explain the reasons for the significant effect of temperature on the number of formed “cleavage initiators”. As attempts to answer this question, one considers the research results presented in [ 17 , 18 , 19 , 20 ], where a physical version of the LA to cleavage fracture was proposed and evidenced. This version of LA does not employ any empirical dependences for the probability of both CN formation and instability.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of Temperature and Plastic Strain Effects into Local Approach to Fracture

et al. 2021

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An unjustified simplification of the local quantitative criterion regarding cleavage nucleation is a key problem in the utilisation of the Local Approach to Fracture (LA), particularly to predict the fracture toughness within the ductile-to-brittle transition (DBT) region. The theoretical concept of the effect of both temperature and the plastic strain value on the crack nuclei (CN) generation rate in iron and ferritic steels is presented. It is shown how the plastic strain and temperature affect CN formation rate and, as a consequence, govern the shape of the temperature dependence of fracture toughness KJc and its scatter limits. Within the framework of the microscopic model proposed, dependences of the CN bulk density on the plastic deformation value and temperature are predicted. Convenient approximation dependences for incorporating this effect into the LA are suggested. The experimental data of reactor pressure vessel steel and cast manganese steel demonstrate that the use of these dependences enables one to predict, with sufficient accuracy, the effect of temperature on the value of fracture toughness and its scatter limits over the DBT region. It is shown that accounting for both the temperature and strain dependence of CN bulk density gives rise to the invariance of parameters of the Weibull distribution to temperature.

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Section: Methodsmentioning

confidence: 99%

“…It consists of the development of a technique for the experimental determination of

. Therefore, a simplified method for determining

for structural steels was proposed [ 17 ]. According to this technique, the value of

Section: Introductionmentioning

confidence: 99%