Abstract
The effect of dislocation substructures on fatigue crack propagation (FCP) behavior in copper and alpha brass was studied. Various dislocation substructures were obtained by prestraining in tension. Dislocation cells were formed by this prestraining in copper and 90/10 brass and when they formed the resistance to FCP at intermediate propagation rates (5×10−9 to ∼10−7 m/cycle) increased with increasing prestrain. Planar dislocation arrays were observed in 70/30 brass instead of cells, and the effect of prestraining on the FCP resistance was insignificant. From the FCP data for each material it was observed that, regardless of the difference in the dislocation substructures and grain sizes, the two constantsC andm in the Paris equation,da/dN=C(ΔK) m, were interrelated. Possible relations between the cyclic strain hardening exponent andm are discussed. The influence of both prestrain and grain size on threshold behavior was also studied.
Similar content being viewed by others
References
R. J. H. Wanhill:Eng. Fract. Mech., 1978, vol. 10, p. 337.
C. Laird:Met. Trans. A, 1977, vol. 8A, p. 851.
A. J. McEvily, Jr., R. C. Boettner, and A. P. Bond:J. Inst. Metals, 1964–65, vol. 93, p. 481.
V. M. Radhakrishnan and P. S. Baburamani:Mater. Sci. Eng., 1975, vol. 17, p. 283.
C. E. Feddersen: ASTM STP, 410, p. 77, 1967.
A. J. McEvily, Jr. and R. C. Boettner:Acta Met., 1963, vol. 11, p. 725.
G. A. Miller, D. H. Avery, and W. A. Backofen:Trans. TMS-AIME, 1966, vol. 236, p. 1667.
H. Ishii and J. Weertman:Met. Trans., 1971, vol. 2, p. 3441.
C. M. Wan and J. G. Byrne:Fracture 1969, P. L. Pratt, ed., p. 598, Chapman and Hall, London, 1969.
A. Saxena and S. D. Antolovich:Met. Trans. A, 1975, vol. 6A, p. 1975.
S. D. Antolovich, A. Saxena, and G. R. Chanani:Eng. Fract. Mech., 1975, vol. 7, p. 649.
T. Yokobori:Methodologies and Fundamentals of Fracture of Matter and Solids, (in Japanese), Iwanami-Shoten, Tokyo, 1974; Russian Translated Edition, Nauka Dumka, Kiev, 1978.
T. Yokobori, S. Konosu, and A. T. Yokobori, Jr.:Advances in Research on the Strength and Fracture of Materials, D. M. R. Taplin, ed., vol. 1, p. 665, Pergamon Press, NY, 1978.
T. Yokobori, I. Kawada, and H. Hata:Rep. Res. Inst. Strength Fract. Mater., Tohoku Univ., 1973, vol. 9, p. 35.
T. Yokobori: ASTM Symposium on Fatigue Mechanisms, Paper 22, Kansas City, May 22–24, 1978.
H. Kitagawa and S. Misumi:Preprint of Japan Soc. Mech. Engrs., No. 714-10, Japan Soc. Mech. Engrs., Tokyo, 1971.
K. Tanaka and S. Matsuoka:Int. J. Fracture, 1977, vol. 13, p. 563.
J. P. Hickerson, Jr. and R. W. Hertzberg:Met. Trans., 1972, vol. 3, p. 179.
T. Yokobori:Rep. Res. Inst. Strength Fract. Mater., Tohoku Univ., 1969, vol. 5, p. 19.
B. Tomkins:Phil. Mag., 1968, vol. 18, p. 1041.
R. J. Cooke and C. J. Beevers:Mater. Sci. Eng., 1974, vol. 13, p. 201.
R. O. Ritchie:Met. Sci., 1977, vol. 11, p. 368.
J. Barsom, E. J. Imhof, and S. T. Rolfe:Eng. Fract. Mech., 1970, vol. 2, p. 301.
H. Kitagawa, H. Nishitani, and J. Matsumoto:Proc. 3rd Int. Congr. Fracture, vol. 6, Paper V-444/A, Munich, 1973.
J. Masounave and J. P. Bailon:Scr. Met., 1976, vol. 10, p. 165.
C. J. Beevers:Met. Sci., 1977, vol. 11, p. 362.
J. P. Benson and D. V. Edmonds,Met. Sci., 1978, vol. 12, p. 223.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ishii, H., Yukawa, K. The role of dislocation substructures in fatigue crack propagation in copper and alpha brass. Metall Trans A 10, 1881–1887 (1979). https://doi.org/10.1007/BF02811733
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02811733