根据各向同性连续介质中的弹性应力场和Mises屈服准则,计算出直Volterra位错芯屈服区的二维几何构型.结果表明:在无限弹性体中,直刃型Volterra位错芯屈服区呈哑铃状,且在滑移面上屈服半宽度最大reg=5.9b(b为Burgers矢量模),攀移面上屈服半宽度最小rec=1.4b;直螺型Volterra位错芯屈服区为圆形,屈服半径rs=4.1b.在半无限弹性体中.受自由表面镜像位错的作用,直螺型位错芯屈服中心向表面偏移,屈服区形态依赖于直螺型位错线与自由表面的间距.
参考文献
| [1] | Divincenzo D P, Rottman C. Phys Rev, 1988; B37:5242 |
| [2] | Yu Z W, Qiang J B, Liu L. Acta Metall Sin, 1999; 25; 348(于志伟.羌建兵.刘路.金属学报,1999;25:348) |
| [3] | Puls M P. In: Ashby M F, Hirth J P eds, Dislocations Modeling of Physical Systems, Pergamon Press; 1981:249 |
| [4] | Frank F C. Philos Mag, 1951; 42:809 |
| [5] | Stroh A N. Proc Roy Soc, 1954; 223A: 404 |
| [6] | Friedel J. Dislocations, Oxford: Pergamon Press; 1964:28 |
| [7] | Foreman A J, Jaswon M A, Wood J K. Proc Roy Soc,1951; 64A: 156 |
| [8] | Xu B Y. Elasticity and Plasticity Mechanics, Beijing: Machinery Industry Press, 1981:526(徐秉业.弹性与塑性力学.北京:机械工业出版社,1981:526) |
| [9] | Hirth J P, Lothe J. Theory of Dislocations, 2nd ed., New York: Jonh Wiley and Sons, 1982:7 |
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