Application of Differential Thermal Calorimetry to Measurements of Stored-Energy Release in Metals

White, J. L.; Koyama, K.

doi:10.1063/1.1718143

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…However, these processes are characterized by small values of the released power and a long-term establishment of thermal equilibrium [10][11][12][13][14][15][16][17].…”

Section: A Procedures For Investigation Of Heat Release Under Strain Amentioning

confidence: 99%

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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“…However, these processes are characterized by small values of the released power and a long-term establishment of thermal equilibrium [10][11][12][13][14][15][16][17].…”

Section: A Procedures For Investigation Of Heat Release Under Strain Amentioning

confidence: 99%

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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“…A similar apparatus has been described by White and Koyama for the measurement of stored-energy release in metals (14)• Helium was used as a conducting gas with some loss in efficiency due to nonadiabatic conditions.…”

Section: Differentialmentioning

confidence: 99%

Calorimetric Studies by Differential Thermal Analysis.

Barrall¹,

Porter²,

Johnson³

1964

Anal. Chem.

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A differential thermal analysis cell has been developed which permits precision calorimetry on polymer and inorganic samples irrespective of initial aggregation state. The apparatus is contrasted with differential thermal analysis cells of conventional design using centrally located thermocouples. Calorimetric errors which arise from changes in sample thermal conductivity are demonstrated to exist in cells of conventional design and to be almost totally removed by the new cell design. The effect of using the new cell is illustrated by tests on a polymer sample with two fusion points and on blends of ethylene and propylene polymers. The necessity of calibrating differential thermal analysis cells at more than one temperature for calorimetry is demonstrated. A,B. Copper sample cups, 4-mm. o.d. by 6 mm. C. Copper reference cup D. Two-conductor ceramic supports, 3-mm. diameter by 50 mm.

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“…Banerjee et al (24) have employed DTA to measure the heat of hard rubber reaction. DTA has also been employed to determine the stored-energy release in metals (244) and from irradiated graphite (178). Ellis and Mortland (71) have compared the area measurement and Clausius-Clapeyron methods of determining heats of reaction with magnesite and kaolinite.…”

Section: Dilatometrymentioning

confidence: 99%

Thermal Analysis

Murphy¹

1964

Anal. Chem.

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Application of Differential Thermal Calorimetry to Measurements of Stored-Energy Release in Metals

Cited by 13 publications

References 18 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

Calorimetric Studies by Differential Thermal Analysis.

Thermal Analysis

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