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| THE DISLOCATION MOTION AT CRACK TIP AND K_(Ⅱc) OF SMALL SCALE YIELDING MATERIALS |
| by LONG Qiwei (LUNG Chi-wei) (Institute of Metal Research; Academia Sinica; Shenyang); GAO Hua (Institute of Mechanics; Academia Sinica; Beijing) |
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Cite this article:
by LONG Qiwei (LUNG Chi-wei) (Institute of Metal Research; Academia Sinica; Shenyang); GAO Hua (Institute of Mechanics; Academia Sinica; Beijing). THE DISLOCATION MOTION AT CRACK TIP AND K_(Ⅱc) OF SMALL SCALE YIELDING MATERIALS. Acta Metall Sin, 1983, 19(3): 65-71.
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Abstract The work done in the formation of plastic zone at the crack tip has been evaluated with a simplified dislocation model and then the critical crack extension force may be calculated. Under various types of deformation, the magnitudes of work done in the plastic zone formation are different due to their different stress distributions at the crack tip. In view of the abovementioned approaches and of consideration of the correlation between K_(Ⅰc) and K_(Ⅱc) for a small scale yielding material, it has come to the conclusion: IK_(Ⅱc)>K_(Ⅰc), which is consistent in the experimental results. The ratio K_(Ⅱc)/K_(Ⅰc) and the temperature dependence of the mechanical properties of materials have been also discussed.
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Received: 18 March 1983
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