1. S. Hashemi andJ. G. Williams,J. Mater. sci. 19 (1984) 3746.
2. Idem, ibid. 20 (1985) 922.
3. ASTM E399-78a, “Standard Test Method for Plane Strain Fracture Toughness of Metallic Materials”, 1979 Annual Book of ASTM standards, Part 10 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1979) p.540.
4. ASTM E813-81, “Standard Test Method for,J IC, A Measure of Fracture Toughness”, 1981 Annual Book of ASTM standards, Part 10 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1981) p. 810.
5. ASTM E813-87, “Standard Test Method for,J IC, A Measure of Fracture Toughness”, 1987 Annual Book of ASTM standards, Part 10 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1987) p. 968.