Crack tip strain localisation on mechanics of fracture of heat resistant steel after hydrogenation

Ясній, Петро Володимирович; Okipnyi, I. B.; Maruschak, Pavlo; Panin, S. V.; Konovalenko, І. V.

doi:10.1016/j.tafmec.2013.03.007

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…The earlier‐stated mechanisms unveil the regular shift of the ductile‐brittle transition temperature towards lower ones for specimens with U‐notch because even at T = −40 °C, there was a fairly well‐developed plastic zone observed at the notch tip. It should be noticed that such macroscopic plasticity does not correspond to the real pattern of fracture of structural elements with crack‐like defects that usually have a sharp tip, while the adequate description of the stress–strain state of such specimens is possible only with the use of non‐linear fracture mechanics, which was performed in the present work.…”

Section: Numerical Experiments Discussion and Consolidation Of Expermentioning

confidence: 94%

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Panin

Maruschak

Власов

et al. 2017

Fatigue Fract Eng Mat Struct

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The fracture energy of 12Cr1MoV steel specimen with V‐shaped, U‐shaped and I‐shaped notches under impact loading was measured and analysed. The results were described using three common approaches to ductile‐brittle fracture: force‐based, energy‐based and strain‐based. Within the stage‐wise approach of physical mesomechanics of materials, the rate of increase/decrease of load at the stage of initiation and propagation of a macroscopic defect was evaluated, providing a good correlation with the work of fracture. The excitable cellular automata technique was applied to simulate the deformational behaviour of the specimens with different shape of notches. It was demonstrated that in the case of the blunted notch, the maximum impact toughness is facilitated by a more uniform distribution of the load along the notch, which hinders brittle fracture at lower testing temperature. For the specimen with the sharp I‐notch, the bands of localised shear are oriented normally to the loading axis, inhibiting macroscopic localisation of strain and crack propagation. For this reason, the impact toughness of the specimen with the I‐notch appeared to be higher than that of the V‐notched one. Using the fractographic analysis and the size of shear lips as a quantitative fracture parameter, a physical‐mechanistic scheme of fracture was suggested for the case of enhanced localised plasticity near the stress riser.

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Section: Numerical Experiments Discussion and Consolidation Of Expermentioning

confidence: 94%

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Panin

Maruschak

Власов

et al. 2017

Fatigue Fract Eng Mat Struct

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“…The specimen fracture surface testifies to a significant non-uniformity of the material, which causes the deformational and grain boundary hardening, as well as the increased sensitivity to strain localization, and proneness to the brittle spalling of the structural components. 19 However, the ''orderliness'' of the banded structure, which is capable of impeding deformation processes on grain boundaries, causes quite a high strength of such a material, although a decreased plasticity, as evidenced by the neck shape (Figure 4(d)-(f)). …”

Section: Mechanical Properties Of the Serviceexposed Pipeline Metalmentioning

confidence: 99%

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Maruschak

Бищак

Prentkovskis

et al. 2016

Advances in Mechanical Engineering

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Mechanical properties are substantiated, that are the most vulnerable to maintenance material deterioration of under prolonged operating time, accompanied by intense damage. The opposite behavior of relative elongation and contraction indicates the intensity of scattered damage of the operated metal. Reducing the percentage reduction indicates operational metal embrittlement, as a result of strain hardening, which can serve as confirmation of the increase in hardness and microhardness. Fractographic analysis of failure mechanisms of steel 17G1S cut in the length and breadth of the pipe is implemented.

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“…In the atomic form, hydrogen will be bound in high-energy traps of the crystal lattice. In molecular form, it will be located in bulk defects (pores and microcracks) [21]. Such hydrogen is difficult to remove from the crystal lattice of the metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen on the Wear Resistance of Steels upon Contact with Plasma Electrolytic Oxidation Layers Synthesized on Aluminum Alloys

Hutsaylyuk

Студент

Dovhunyk

et al. 2019

Metals

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The different nature of the effect of hydrogen on the tribological behavior of two carbon steels (st. 45 and st. U8) upon their contact with super solid plasma electrolytic oxidation (PEO) layers synthesized on two light alloys (AMg-6 and D16T alloys as the analogists of the A 95556 UNS USA and AA2024 ANSI USA alloys correspondently) was investigated in the medium of mineral oil of the I-20 type. To compare the effect of hydrogenation on the tribological properties of the analyzed contact pairs, similar tests were also performed on the same mineral oil with clear water or an aqueous solution of glycerine added to its content. A spinel-type film (hercynite) was formed upon friction of two contacting surfaces—the iron-carbon steels and PEO layers synthesized on the AMg-6 alloy. This film was a reliable protection against wear of the surface subjected to the effect of hydrogen. When steels came into contact with the PEO layers synthesized on the D16T alloy, surface protection against wear was ensured by another mechanism. The phenomenon of selective metal transfer in the friction zone (from one to another friction surfaces) was revealed.

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Crack tip strain localisation on mechanics of fracture of heat resistant steel after hydrogenation

Cited by 22 publications

References 11 publications

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

The role of notch tip shape and radius on deformation mechanisms of 12Cr1MoV steel under impact loading. Part 2. Influence of strain localization on fracture and numeric simulations

Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel

Effect of Hydrogen on the Wear Resistance of Steels upon Contact with Plasma Electrolytic Oxidation Layers Synthesized on Aluminum Alloys

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