材料力学部門講演会講演論文集
Online ISSN : 2433-1287
会議情報
322 疲労き裂進展における残留転位群の遮蔽効果
森田 辰郎荒木 栄敏齋藤 憲司
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会議録・要旨集 フリー

p. 207-208

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抄録
This study is conducted to clarify the influence that the dislocations left over around the fatigue crack have on the propagation rate through the computer simulation of the dislocation dynamics. The computer simulation is based on the equation concerning the elastic interaction of a semi-infinite crack with edge dislocations. The result of the basic analysis shows that the exisitence of dislocations near the crack-tip suppress the emission of new dislocations. This predicts that the shielding effect owing to the dislocations is one of the important factors which affect the propagation rate of the fatigue crack. Furthermore, the results of the computer simulation show that the transient fatigue crack propagation with the sudden change of the stress intensity factor amplitude can be qualitatively understood from the viewpoint of the change of the shielding effect which is induced by the dislocations left over around the crack.
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