Constancy of the stress intensity factor at the tip of a crack during its propagation is a rectangular plate

Bokhmurskii, V. I.; Kundrat, N. M.; Bilyi, L. М.; Berezhnitskii, L. T.; Shved, M. M.

doi:10.1007/bf01538005

Cited by 3 publications

(6 citation statements)

References 2 publications

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“…It was established [3] that an increase in the ratio 2y0/2x 0 leads to elongation of the range of stabilization of a stress-strain state near the tip of a growing crack in a prismatic specimen. Its maximum value is attained with the ratio 2Y~ -2.4.…”

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

“…Using the analytic solution of this problem [3,4], we can easily find the numerical values of A K at the tip of the crack for the corresponding geometry of loading. For example, for the optimal ratio 2y0/2x 0 = 2.4, the dependence of AK on the angle of deformation is described by the relation…”

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

“…The scheme and solution of the mentioned problem are well known [2]. Construction of the mapping function and calculation of the dimensionless quantity Kyo/(gOxo) 3/2, where K is the stress intensity factor and g is the shear modulus, for various lengths of cracks and geometries of a plate (ratio of the length of the working part to the width) were carried out in [3]. An increase in the number of terms of the series leads to a certain rise in the ratio Kyo/(gOxo) 3/2.…”

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

“…Here, t is the complex coordinate along the edges of the plate and Zo + iyo and Zo -iYo are, respectively, the middle points of the corresponding edges. The problem was solved in [3] by the Bloom method [2] by using the Christoffel-Schwartz formula and the function …”

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

“…As a theoretical foundation of the method for investigation of static crack resistance, we take a solution of the Bloom problem for a lateral crack in a beam specimen [2] which is supplemented by calculations of the maximum interval of constancy of the stress intensity factor in the process of growth of a crack [3,4].…”

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

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Two methods of investigation of the influence of hydrogen on the propagation rate of a crack and behavior of fracture of high-strength steels

Balyts’kyi¹

1998

Mater Sci

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We present two methods for the investigation of the influence of hydrogen on the propagation rate of a crack and behavior of fracture of high-strength steels. The method for investigation of the influence of electrolytic hydrogenation on a subcritical growth of a crack in high-strength steels is based on the use of simple beam specimens of a certain geometry and on the application of lateral loading in such a way that the stress intensity factor can be constant at the tip of a preliminary induced crack. The method is of great importance for the performance of comparative experiments in evaluating the influence of active media and structural anisotropy of specimens made of high-strength steels with limited sizes on their corrosion crack resistance. Typical examples of the application of the method to investigation of the role of electrolytic hydrogenation in subcritical propagation of cracks and their branching in highstrength steels are given. The method for investigation of heat release under strain and fracture of hydrogenated specimens involves the use of microcalorimetric devices, which allow one to study the influence of hydrogenation on peculiarities of the kinetics of elastic and plastic strains of high-strength steels. We illustrate the efficiency of the method proposed by plotting the "load--elongation" curves and corresponding (in time) characteristics of heat release power in the process of strain and fracture of specimens made of a high-strength steel.Under actual service conditions of a structure with nonpropagating cracks, a long-term influence of the medium together with the action of mechanical stresses can lead to the start and growth of cracks that result in fracture of highly loaded components.In this connection, methods for investigation of the influence of aggressive media at the initial and subcriticalgrowth stages as well as behavior of fracture of high-strength steels in the range of significant plastic strains (up to the creation of large areas of newly made surfaces) are of great importance. The possibility of simultaneous electrolytic hydrogenation of materials is extremely important because, in many cases, it simulates actual service conditions of highly loaded components made of high-strength materials. A Method for Investigation of the Influence of Electrolytic Hydrogenation on the Subcritical Growth of Cracks in High-Strength SteelsWhile investigating corrosion cracking, we consider the method according to which the stress intensity factor becomes stable due to a designed loading scheme and the corresponding choice of an optimum geometry of a specimen as a promising one.Limited thickness of actual highly loaded components (in particular, shrouds of turbogenerators) makes it impossible to use other types of specimens, e.g., disk specimens [1], which would ensure a given constant value of the stress intensity factor. For this reason, we take prismatic rectangular specimens with lateral cracks which are simple to produce and involve small material consumption.As a theoretical foundatio...

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Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

Section: A Methods For Investigation Of the Influence Of Electrolytic mentioning

confidence: 99%

See 3 more Smart Citations

Two methods of investigation of the influence of hydrogen on the propagation rate of a crack and behavior of fracture of high-strength steels

Balyts’kyi¹

1998

Mater Sci

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Influence of electrolytic hydrogenation on cyclic crack resistance of chromium-nickel steels

Pokhmurs'kyi¹,

Bilyi²

1999

Mater Sci

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Within the framework of linear fracture mechanics, we estimate the resistance of chromium-nickel 06KhI7N13M3, 07Kh16N6, and 10Kh26N5M steels to hydrogen embrittlement after various thermal treatments. We established that electrolytic hydrogenation leads to a considerable increase in the growth rate of fatigue cracks in steels with maximum in a low-amplitude range (by approximately a factor of 5-25 as compared with tests in air). The optimal mode of thermal treatment of 10Kh26N5M steel corresponds to quenching at 1293 K and annealing at 623 K. This mode ensures high plastic characteristics and maximum resistance to fatigue fracture in air in the course of electrolytic saturation with hydrogen, and long-term holding in a chloride-containing environment. We recommend this steel for the manufacture of critical parts of oil separators of marine ships.Residual hydrogen (after metallurgical operations) in a metal and hydrogen which diffused in the course of metal working can lead to embrittlement and loss of mechanical workability of parts of machines and structures [1]. Brittle fracture of parts due to hydrogenation is one of the reasons for emergency situations in the service of separators aboard marine ships (the medium: seawater and technical oil, a pressure of 10 MPa, and a temperature of 353 K). Therefore, materials used for this equipment must have not only high mechanical properties but be fairly hydrogen-resistant against the total action of a corrosion medium and cyclic loadings. Since the resistance of steels to hydrogen embrittlement depends substantially on thermal treatment and the character of loadings, we carried out model investigations of the influence of electrolytic hydrogenation on the subcritical growth rate of fatigue cracks and on the plastic properties of chromium-nickel stainless steels.

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Evaluation of the Service Life of a Hip Joint Made of 08Kh18N10T Steel by the Methods of Fracture Mechanics

Lychkovs'kyi

2005

Mater Sci

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Constancy of the stress intensity factor at the tip of a crack during its propagation is a rectangular plate

Cited by 3 publications

References 2 publications

Two methods of investigation of the influence of hydrogen on the propagation rate of a crack and behavior of fracture of high-strength steels

Two methods of investigation of the influence of hydrogen on the propagation rate of a crack and behavior of fracture of high-strength steels

Influence of electrolytic hydrogenation on cyclic crack resistance of chromium-nickel steels

Evaluation of the Service Life of a Hip Joint Made of 08Kh18N10T Steel by the Methods of Fracture Mechanics

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