Computer simulation of dislocation emission from a stressed source

Yokobori, Takeo; Yokobori, A. T.; Kamei, Atsushi

doi:10.1080/14786439808206563

Cited by 37 publications

(21 citation statements)

References 3 publications

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“…Furthermore, this first result was later used [2] in relating the distance moved by the lead dislocation and the number of emitted dislocations produced, by assuming an exponential type relation between dislocation velocity and applied stress, which may not be completely reasonable. In the present article an attempt has been made to extend the computer simulated results [3] on dislocation dynamics to analyze fatigue crack growth mechanism, including the model of blunting and resharpening [4]. In the present article an attempt has been made to extend the computer simulated results [3] on dislocation dynamics to analyze fatigue crack growth mechanism, including the model of blunting and resharpening [4].…”

Section: Introductionmentioning

confidence: 96%

“…One of the authors however has made an initial attempt [1] to treat the subject, but in this first approximation, a crude power type simplification was made in relating the dislocation velocity and applied stress. Thereafter we made a computer simulation [3] on the dislocations emission from the stressed source under a constant rate of stress application. Thereafter we made a computer simulation [3] on the dislocations emission from the stressed source under a constant rate of stress application.…”

Section: Introductionmentioning

confidence: 99%

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Dislocation dynamics theory for fatigue crack growth

Yokobori

Kamei

1975

Int J Fract

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A B S T R A C T Dislocation group dynamics theory is used to deduce a power type expression for fatigue crack growth. In general, the results reflect only a single rate process, and thus one activation energy which is small compared to those in usual rate processes. The frequency dependence for this power function type fatigue crack growth rate was also obtained, and yield reasonable agreement with experimental results from the literaturel

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Dislocation dynamics theory for fatigue crack growth

Yokobori

Kamei

1975

Int J Fract

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“…However, damage function, B is a dominant factor to derive creep strain as shown in Eqs. [27] and [28] which results in creep fracture life. In this expression, t f is unknown and it is included in the damage function.…”

Section: Analysis Of Micro-creep Damage Relatedmentioning

confidence: 99%

“…[25], B can be theoretically derived based on the vacancy diffusion analysis and creep strain can be theoretically predicted using our proposed B by Eqs. [27] and [28]. Creep fracture life can be predicted by creep strain, since creep fracture usually closely concerns the critical creep strain.…”

Section: Analysis Of Micro-creep Damage Relatedmentioning

confidence: 99%

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Theory of particle transport phenomena during fatigue and time-dependent fracture of materials based on mesoscale dynamics and their practical applications

Yokobori

2020

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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In this work, the mesoscale mechanics of metals, which links their microscopic physics and macroscopic mechanics, was established. For practical applications, the laws for quantitatively predicting life of cycle and time-dependent fracture behavior such as fatigue, hydrogen embrittlement, and high-temperature creep were derived using particle transport phenomena theories such as dislocation group dynamics, hydrogen diffusion, and vacancy diffusion. Furthermore, these concepts were also applied for estimating the degree of viscoelastic deterioration of blood vessel walls, which is dominated by a time-dependent mechanism, and for the diagnosis of aneurysm accompanied by the viscoelastic deterioration of the blood vessel wall. In these theories, new mechanical indexes were derived as dominant factors for predicting the life of fatigue crack growth and the time-dependent fracture of notched specimens of materials such as hydrogen embrittlement and high-temperature creep. Furthermore, as an example of a practical application, these theories were applied to estimate the degree of viscoelastic deterioration and chaotic motions of blood vessel walls, which are closely related to blood vessel diseases such as atherosclerosis and aneurysm. Moreover, new indexes to diagnose them were also proposed for clinical applications.

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The equilibrium between dislocations and dislocation dipoles. II. Dynamics

Sadananda

Marcinkowski

1975

Phys. Stat. Sol. (a)

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A detailed analysis of the behavior of passing dislocations under dynamic conditions has been made using the principle of conservation of energy. In particular, the analysis of the behavior of different thermodynamic systems containing a pair of passing dislocations under different conditions of applied stress, frictional stress etc., has been presented. The above analysis is next extended to the system containing both passing dislocations and dislocation dipoles. While the present analysis is preliminary in nature, it shows that the kinetic energy of passing dislocations can significantly help them to overcome their barriers. A detailed understanding of various energy dissipation mechanisms, however, is required before a full understanding can be obtained of the behavior of passing dislocations under dynamic conditions.

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Computer simulation of dislocation emission from a stressed source

Cited by 37 publications

References 3 publications

Dislocation dynamics theory for fatigue crack growth

Dislocation dynamics theory for fatigue crack growth

Theory of particle transport phenomena during fatigue and time-dependent fracture of materials based on mesoscale dynamics and their practical applications

The equilibrium between dislocations and dislocation dipoles. II. Dynamics

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