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| EFFECT OF DISLOCATION IMAGE FORCE ON DISLOCATION DISTRIBUTION IN PLASTIC ZONE AT CRACK TIP |
| by LIU Su; XIONG Liangyue; LONG Qiwei(C. W. Lung)(Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 17 July; 1985; revised manuscript 17 April; 1986) |
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Cite this article:
by LIU Su; XIONG Liangyue; LONG Qiwei(C. W. Lung)(Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 17 July; 1985; revised manuscript 17 April; 1986). EFFECT OF DISLOCATION IMAGE FORCE ON DISLOCATION DISTRIBUTION IN PLASTIC ZONE AT CRACK TIP. Acta Metall Sin, 1987, 23(5): 349-355.
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Abstract The equilibrium dislocation distribution in the plastic zone at a crack tip has been calculated, where the influence of image force of dislocation was involved. The results were compared with that in which dislocation image force was omitted. A maximum value α_c was obtained for the applied stress level α, and thus a critical value α_c was correspondingly obtained for the size of plastic zone α, The dislocation image force makes the plastic zone become large while α<α_c, and the ligament yielding takes place if α>α_c. This qualitatively agrees with the experimental results of positron annihilation measurement published be fore.
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Received: 18 May 1987
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