Use of local approaches to calculate changes in cleavage fracture toughness due to pre-straining and constraint effects

Jivkov, Andrey P.; Burgos, Diego Sarzosa; Ruggieri, Cláudio; Beswick, Jack; Savioli, Rafael; James, Peter; Sherry, Andrew H.

doi:10.1016/j.tafmec.2019.102380

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…Despite the relative simplicity and eectiveness of the Beremin model and its extensions (see, e.g., the representative works of Gao et al [36], Gao and Dodds [37,38], Petti and Dodds [39,12], Ruggieri [40,41], R&D [23,2] and Jivkov et al [42]), a potential drawback with this approach is that the parameters dening Eq. (3), particularly the Weibull modulus, m (the scale parameter, σ u , follows directly from the σ w -value corresponding to P f = 63.2 % in Eq.…”

Section: Inaries and Local Approachmentioning

confidence: 99%

A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel

Ruggieri

Jivkov²

2022

Engineering Fracture Mechanics

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Section: Inaries and Local Approachmentioning

confidence: 99%

A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel

Ruggieri

Jivkov²

2022

Engineering Fracture Mechanics

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“…Jivkov et.al. [23]present an approach upon the Weibull stress concept incorporating the statistics of micro-cracks, plastic strain effects, and the in uence of pre-strain on the number of eligible microcracks nucleated from brittle particles. It can describe the effects of constraint loss and pre-strain on macroscopic changes in cleavage fracture toughness applicable to fracture specimens tested in the ductile-tobrittle transition region.…”

Section: Introductionmentioning

confidence: 99%

Effects of in-service strain on girth weld failure of an X80 pipeline

Hongyuan,

Xiongxiong,

Dongliang

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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In general, transmission pipelines are designed by hoop stress induced by internal pressure, and maximum longitudinal stress. The paper is mainly about the failure analysis of an X80 pipeline brittle fracture on girth weld under in-service strain. The digital image correlation (DIC) in the tensile tests was used to analyze the permanent plastic strain on girth weld metal under in-service strain. Then, the Charpy energy of the girth weld metal with the concentrated plastic strain was tested to evaluate the deterioration of toughness. Finally, the mechanism of the brittle fracture of the girth weld is clari ed. The results show that the girth welds may have obvious plastic deformation under an elastic in-service strain of the pipeline. It may lead to a signi cant deterioration of the toughness, which results in the failure of the pipeline under the strain-controlled load.

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“…All this contradicts the initial statements of the Local Approach. A number of studies have attempted to solve this problem [ 11 , 12 , 13 , 14 , 15 , 16 ]. These works showed the need to address two key issues, namely: (i) the need to incorporate the effect of temperature and the magnitude of local plastic strain on the CN bulk density ρ; (ii) the need to account for the value of the threshold stress

.…”

Section: Introductionmentioning

confidence: 99%

“…Ruggieri and Jivkov et al [ 15 , 16 ] tried to incorporate the effect of plastic strain and test temperature on the number of CN forming in the local plastic zone ahead of a macrocrack tip. This was achieved by revising the expression for the Weibull stress.…”

Section: Introductionmentioning

confidence: 99%

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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Use of local approaches to calculate changes in cleavage fracture toughness due to pre-straining and constraint effects

Cited by 10 publications

References 24 publications

A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel

A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel

Effects of in-service strain on girth weld failure of an X80 pipeline

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

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