5 Huang,Y.(黄毅);Li,S.X.(李守新);Shih,C.H.(师昌绪),to be presented in Sixth Int.Conf.on Fracture,1984．
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6 Nabarro,F.R.N.,Theory of Crystal Dislocation,Oxford University Press,U.S.A.,1967,p.692．
[7]
7 Tay,A.O.;Oxley,P.L.B.,Finite Element Methods in Engineering,Proc.1976 Int.Conf.on Finite Element Methods in Engineering,Australia,1976,p.42． 1-42． 21．
