1. 1) J.R. RICE: J. Appl. Mech., (1968), June p.379
2. 2) J.D. LAMDES and J.A. BEGLEY: ASTM STP 560, (1974), p.170
3. 5) British Standard Institution: Methods for Crack Opening Displacement (COD) Testing, DD19, (1972)
4. 6) M.G. DAWES: The Welding Inst. Res. Bull., (1976), July p.185
5. 7) H. TADA, P. PARIS, and G. IRWlN: The Stress Analysis of Cracks Handbook, Del Res. Co. Pennsylvania, (1973)