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

Котречко, С. А.; Kozák, Vladislav; Zatsarna, Oleksandra; Zimina, Galyna; Stetsenko, Nataliya; Dlouhý, Ivo

doi:10.3390/ma14206224

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…5). Specific feature of brittle fracture of bcc metals and alloys is that it is initiated by those CNs that become unstable at the moment of their formation [11,12]. This is one of the reasons why the energy consumption for failure of the crystal lattice at the tip of such submicroscopic CN is insignificant and comparable with the surface energy of metal.…”

Section: Resultsmentioning

confidence: 99%

“…This dependence takes into account the fact that the sides of a shear crack are pressed against each other by a force of 2 9) for the area of local yield region and, accordingly, relation (12) for the increase in the average temperature in this region, are obtained in the approximation of an ideally plastic material. It means that the effect of strain hardening isn't taken into account.…”

Section:  mentioning

confidence: 99%

“…In this case, the value of heating temperature of metal at the crack tip depends significantly on both the absolute value of yield strength st Yef  and the ratio / st Yef f   . Really, substituting expression ( 14) into (12) and writing the relationship between Y  and st Yef…”

Section: The Main Factors Inducing Explosive Failure Of Heamentioning

confidence: 99%

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Phenomenon of ignition and explosion of high-entropy alloys of systems Ti-Zr-Hf-Ni-Cu, Ti-Zr-Hf-Ni-Cu-Co under quasi-static compression

Zatsarna,

Kotrechko,

Filatov

et al. 2024

Frattura Ed Integrità Strutturale

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The phenomenon of ignition and explosive failure of specimens from high-entropy alloys (HEAs) of systems Ti-Zr-Hf-Ni-Cu, Ti-Zr-Hf-Ni-Cu-Co at quasi-static compression tests was found. It physical model is proposed. It is exhibited that the reason for this phenomenon is the release of energy of the oxidation reaction; such reaction is initiated due to the heat released ahead of the shear crack tip at brittle fracture of the specimens under quasi-static compression. It is shown that ignition and failure by explosion are the specific features of brittle fracture for high-entropy alloys containing Ti-Zr-Hf, in general. This phenomenon is realised when certain critical levels of strength and ductility of these alloys are reached. The importance of these critical levels of strength and ductility lies in the fact that they predetermine the maximum permissible level of strength and brittleness for this class of HEAs, above which they lose their structural and functional properties, turning to the energetic alloys capable of explosive release of a significant amount of thermal energy. This specific feature of the high-entropy alloys containing Ti-Zr-Hf outlines the scope of their application and defines the boundary separating structural and functional high-entropy alloys from energetic high-entropy alloys.

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Section: Resultsmentioning

confidence: 99%

Section:  mentioning

confidence: 99%

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Phenomenon of ignition and explosion of high-entropy alloys of systems Ti-Zr-Hf-Ni-Cu, Ti-Zr-Hf-Ni-Cu-Co under quasi-static compression

Zatsarna,

Kotrechko,

Filatov

et al. 2024

Frattura Ed Integrità Strutturale

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“…Kotrechko et.al. [24] present the theoretical concept of the effect of the plastic strain value on the crack nuclei generation rate in iron and ferritic steels. It is shown how the plastic strain and temperature affect CN formation rate and, govern the shape of the temperature dependence of fracture toughness and its scatter limits consequently.…”

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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“…The final stage of failure development of bodies, which is the subject of fracture mechanics investigation, is crack propagation (unstable or stable). Attention is paid to understanding this behaviour of structural materials to the deterministic approaches and to the computational modelling of such processes for the case of several representative types of composites, unlike various types of probabilistic considerations by [4][5][6][7], or discrete element techniques by [8,9], or even those relying on techniques of artificial intelligence as [10]. This article used the long-time experience of both authors in this research field, which is confronted with new models, methods and results developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Use of Cohesive Approaches for Modelling Critical States in Fibre Reinforced Structural Materials

Kozák,

Vala

2024

Preprint

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This paper is showing the results of a study focused on the occurrence of failures in heterogeneous structural materials, especially on the issue of modelling the formation and propagation of cracks. Attention is paid to the application of the finite element method to various types of materials in order to find critical parameters determining the behaviour of materials during the damage process. Application of damage mechanisms and approaches to modelling the origin of crack propagation by modifications in FEM systems are presented. Furthermore, some practical applications are tested. The main effort is devoted to composites and searching for procedures when using cohesion models for their more accurate modelling, especially near the stress concentrators, or before the crack tip. The use of the cohesive approach of elements that represent the physical nature of energy release in front of the crack front has proven to be promising not only in the direct use of cohesive elements, but also in combination with modified methods of standard finite elements. The authors of this article use their long-term experience in the given issue, which they consistently confront with developments in this area in recent years.

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

Cited by 6 publications

References 24 publications

Phenomenon of ignition and explosion of high-entropy alloys of systems Ti-Zr-Hf-Ni-Cu, Ti-Zr-Hf-Ni-Cu-Co under quasi-static compression

Phenomenon of ignition and explosion of high-entropy alloys of systems Ti-Zr-Hf-Ni-Cu, Ti-Zr-Hf-Ni-Cu-Co under quasi-static compression

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

Use of Cohesive Approaches for Modelling Critical States in Fibre Reinforced Structural Materials

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