PARAMETRIC DISLOCATION DYNAMICS AND BOUNDARY ELEMENT MODELING OF ELASTIC

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PARAMETRIC DISLOCATION DYNAMICS AND BOUNDARY ELEMENT MODELING OF ELASTIC

Parametric dislocation dynamics and boundary element modeling of elastic interaction between dislocations and precipitates

Parametric dislocation dynamics and boundary element modeling of elastic interaction between dislocations and precipitates


Akiyuki Takahashi

Department of Mechanical Engineering, Faculty of Science and Technology,

Tokyo University of Science

2641, Yamazaki, Noda-shi, Chiba 278-8510, Japan



The formation of precipitates and the interaction with dislocations in metals are responsible for the degradation of the material strength subjected to high-energy neutron irradiations. Understanding the interaction between the dislocations and precipitates, and the subsequent degradation of the material strength are thus very important. In this seminar, a hybrid computer simulation method with the combination of the parametric dislocation dynamics (PDD) and the boundary element method (BEM) to investigate the dislocation-precipitate interaction problems is presented, which enables us to simulate the interaction between a flexible dislocation and precipitates with any geometrical shapes. The method is first applied to the simulation of the interaction between a dislocation and a copper precipitate in bcc-Fe. The results show a good consistency with the results of molecular dynamics (MD). Then, we investigated the effects of the diameter, spacing and elastic constant of a spherical precipitate on the interaction with a dislocation. Finally, an extension of the present method to incorporate the dislocation core effects will also be presented.


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Tags: boundary element, the boundary, modeling, boundary, element, dislocation, elastic, parametric, dynamics