Effect of Temperature-Force Factors and Concentrator Shape on Impact Fracture Mechanisms of 17Mn1Si Steel

Panin, S. V.; Maruschak, Pavlo; Власов, И. В.; Моисеенко, Д. Д.; Berto, Filippo; Vinogradov, Alexei

doi:10.1155/2017/9867217

Cited by 7 publications

(4 citation statements)

References 29 publications

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“…Although the crack layer is confined to be coplanar with the notch in Charpy impact experiments (due to the natural restriction in bending, imposed by the maximum moment occurring in crack [29][30][31]. Therefore, one is forced to use an average height to represent the crack layer thickness to quantify fracture energy dissipation.…”

Section: Methods Of Scaling Of Crack Layer Fracture Energy and Volume...mentioning

confidence: 99%

“…Here the hfalse¯ value is to be interpreted as the average height of the fracture layer coplanar with the crack, in the sense of hfalse¯=1W−a∫aWh(w) dw,where h ( w ) is the variation in crack layer height as a function of distance along the ligament. Although the crack layer is confined to be coplanar with the notch in Charpy impact experiments (due to the natural restriction in bending, imposed by the maximum moment occurring in crack plane), variations in crack layer thickness can occur in situations of high plasticity [29–31]. Therefore, one is forced to use an average height to represent the crack layer thickness to quantify fracture energy dissipation.…”

Section: Methods Of Scaling Of Crack Layer Fracture Energy and Volume...mentioning

confidence: 99%

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Mechanics of structural size effect in impact brittle fracture of steels and consequent scaling laws for fracture

Chandran

2024

Proc. R. Soc. A.

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A large structural size effect on brittle fracture energy was observed in studies of impact fracture of steels by Stanton, Batson and Docherty, nearly 100 years ago. The size effect was seen in macroscopically brittle fractures of geometrically similar specimens tested over a large size range. These historical findings have great significance in designing large-scale steel structures such as ships and bridges. However, there has been no physical principle or theory yet to explain the size effects observed by Stanton, Batson and Docherty. In the present work, a new approach based on net-section mechanics is used to explain the size effect. It is shown that the change in net-section strain energy predicts well the size effect on fracture energy , under the constant condition of cleavage crack initiation stress at the notch root. The spectacular decrease in specific fracture energy with increased specimen size is explained by noting the three-dimensional nature of stored strain energy and the two-dimensional nature of fracture energy dissipated in the crack layer. By scaling both energies to a reference cubic specimen volume and equating, an expression that describes the inverse size dependence of specific fracture energy has been formulated. The mechanics of the size effect is illustrated by assessing the theory with extensive experimental data. Further, scaling laws for fracture energy have been developed. This work honours the pioneering studies of Stanton, Batson and Docherty, which have been instrumental for the development of the present theory and analysis.

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Section: Methods Of Scaling Of Crack Layer Fracture Energy and Volume...mentioning

confidence: 99%

Section: Methods Of Scaling Of Crack Layer Fracture Energy and Volume...mentioning

confidence: 99%

Mechanics of structural size effect in impact brittle fracture of steels and consequent scaling laws for fracture

Chandran

2024

Proc. R. Soc. A.

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“…T = −20 °C: The fracture mechanism is similar to that at T = 20 °C. The size of ductile fracture pits is slightly smaller (Figure 9b) [44,45]. T = −60 °C: The major fracture mechanism at this temperature was cleavage.…”

Section: Fracture Micromechanismsmentioning

confidence: 96%

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Моисеенко

Maruschak

Panin

et al. 2017

Metals

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Abstract:The paper deals with a theoretical and experimental study of the relationship between the microstructural parameters, mechanical properties, and impact deformation and fracture of steels using the example of 17Mn1Si pipe steel. A model for the behavior of a polycrystalline grain conglomerate under impact loading at different temperatures was proposed within a cellular automata framework. It was shown that the intensity of dissipation processes explicitly depends on temperature and these processes play an important role in stress relaxation at the boundaries of structural elements. The Experimental study reveals the relationship between pendulum impact test temperature and the deformation/fracture energy of the steel. The impact toughness was shown to decrease almost linearly with the decreasing test temperature, which agrees with the fractographic analysis data confirming the increase in the fraction of brittle fracture in this case. It was shown with the aid of the proposed model and numerical simulations that the use of the excitable cellular automata method and an explicit account of test temperature through the possibility of energy release at internal interfaces help to explain the experimentally observed features of impact failure at different temperatures.

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“…At the same time, it is important today to find ways to reduce the wear of friction units of machines of existing structures. The priority is the creation of parts and mechanisms that differ in wear resistance, the ability to work at high specific pressure, high speeds and temperatures [6]. This is an important aspect of the further development of sea and river transport.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Tribological Properties of Two-Component Bidisperse Epoxy-Polyester Composite Materials for Its Use in the Friction Units of Means of Sea Transport

Букетов

Brailo

Yakushchenko

et al. 2019

Period. Polytech. Mech. Eng.

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The tribological properties of complex polymeric materials, which include epoxy and polyester resins, two hardeners and two microdispersed fillers: mica-muscovite, copper (II) oxide, were investigated in the work. The results of the testing of specimens at dry friction and in the lubricant were analyzed. It is proved, that the antifriction properties of the composite depend on its composition, formation technology and testing conditions. It has been experimentally determined, that the material which was tested in the lubricating environment -I m = 0.25-0.30 mg/km, f = 0.03-0.04, differs with the improved indexes of wear rate and friction coefficient. As a result of the analysis of investigated microsurfaces studied by optical and electron microscopy, the phase heterogeneity of the composite material system was identified. It contributes to the reduction of the running-in distance of the specimen, and indicates the uniform distribution of the filler particles on the surface, has been found. The elemental composition of the compound was determined, which indicates the direct involvement of fillers in the process of friction. A change in the ratio of atoms on the specimen surface before and after the test was found. The results of the study of the surface in the phase contrast mode correlate with the results of the data obtained by electron microscopy.

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Effect of Temperature-Force Factors and Concentrator Shape on Impact Fracture Mechanisms of 17Mn1Si Steel

Cited by 7 publications

References 29 publications

Mechanics of structural size effect in impact brittle fracture of steels and consequent scaling laws for fracture

Mechanics of structural size effect in impact brittle fracture of steels and consequent scaling laws for fracture

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

Investigation of Tribological Properties of Two-Component Bidisperse Epoxy-Polyester Composite Materials for Its Use in the Friction Units of Means of Sea Transport

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