[1] J.R.Rice and R.Thomsn: Philos. Mag., 1974, 29, 73. [2] A.S.Argon: Acta Metall., 1987, 35, 185. [3] Y.H.Chia and D.R.Clark: Acta Metall., 1989, 37,23. [4] K.W.Gao, W.Y.Chu and C.M.Hsia: Schota Metall.inter., 1992, 26, 813. [5] Q.Z.Chen, W.Y.Chu and C.M.Hsia: SCi. Sin. A,1993, 36, to be published. [6] G.P.Cherepanov: Michanics of Brittle Fracture,McGraw-Hill Int. Bok Comp., New York, NY, 1979,100. [7] M.Creager and P.C.Paris: Int. J. Frac. ANch., 1967,4, 247. [8] J.Weertman, I.H.Lin and R.Thomsn: Acta Metall.,1983, 31, 473. [9] R.E.Schafrik: Metall. Trans., 1977, 8A,1003. |