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REFERENCES 1. N.J.I. Adams: Eng. Fract. Mech., 1972, vol. 4, pp. 543-54. 2. W.L. Morris: Metall. Trans. A, 1977, vol. 8A, pp. 589-96. 3. R.O. Ritchie, S. Suresh, and C.M. Moss: Trans. ASME-J. Eng. Matls. and Tech., 1980, vol. 102, pp. 293-99. 4. S. Suresh, G. E Zamiski, and R. O. Ritchie: Metall. Trans. A, 1981, vol. 12A, pp. 1435-43. 5. M.D. Hallidy and C.J. Beevers: J. Test. Eval., 1981, vol. 9, pp. 195-201. 6. R.O. Ritchie and S. Suresh: Metall. Trans. A, 1982, vol. 13A, pp. 937-40. 7. M.H. El Haddad, N.E. Dowling, T.H. Topper, and K.N. Smith: Int. J. Fract., 1980, vol. 16, pp. 15-30. 8. M.H. El Haddad, T. H. Topper, and K. N. Smith: Eng. Fract. Mech., 1979, vol. 11, pp. 573-84. 9. N.E. Dowling: Cyclic Stress-Strain and Plastic Deformation Aspects of Fatigue Crack Growth, ASTM STP-637, Am. Soc. Test. Matls., Philadelphia, PA, 1977, pp. 97-121. 10. W.L. Morris, M.R. James, and O. Buck: MetaU. Trans. A, 1981, vol. 12A, pp. 57-64. 11. C.Y. Yang and H. W. Liu: Scripta Met., 1980, vol. 14, pp. 785-90. 12. W.L. Morris, M. R. James, and O. Buck: "A Simple Model of Stress Intensity Range Threshold and Crack Closure Stress," Eng. Fract. Mech., in press. 13. W.L. Morris, M. R. James, and O. Buck: Nondestructive EvaluationMicrostructural Characterization and Reliability Strategies, O. Buck and S. M. Wolf, eds., TMS-AIME, Warrendale, PA, 1981, pp. 387-99. 14. J.E. Hack and G. R. Leverant: Fatigue Microcrack Behavior Under the Influence of Surface Residual Stresses, Interim Report for Contract N00014-78-C-0674, ONR NR 031-812, Southwest Research Institute, San Antonio, TX, October 1980. 15. E W. Smith and D.R. Sorenson: Int. J. Fract., 1976, vol. 12, pp. 47-57. 16. C.G. Annis: Pratt and Whitney Aircraft Co., West Palm Beach, FL, private communication, 1981. 17. W.L. Morris and O. Buck: MetaU. Trans. A, 1977, vol. 8A, pp. 597-601. 18. K. Tanaka, Y. Nakai, and M. Yamashita: Int. J. Fract., 1981, vol. 17, pp. 519-33.

On the Determination of Flow Properties from Compression Tests K.K. RAY and A. K. MALLIK To evaluate the deformation behavior of materials at high strains, the compression test is ideal, but it suffers from the problem of friction at the specimen-platen interface, which imparts nonhomogeneous uniaxial deformation in the specimen. Several attempts have been made in the past to ascertain flow behavior in homogeneous uniaxial compression from tests in which the deformation is not perfectly homogeneous, and a good account of these is given by Hsu. Of these investigations, Sachs 2 and Cook and Larke 3 attempted to account the frictional work done in compression K.K. RAY and A. K. MALLIK are associated with the Department of Metallurgical Engineering, Indian Institute of Technology, Powai, Bombay 400076, India. Manuscript submitted February 16, 1982. METALLURGICALTRANSACTIONS A

tests by carrying out tests at several diameter (d) to height (h) ratios and graphically extrapolating the data obtained to zero d/h ratio. Hsu I and Young and Hsu 4 have shown that use of teflon tape as a lubricant, replaced at regular interval