Abstract
On the basis of a model of an `active zone' for initiating cleavage fracture proposed by authors, the distributions of cleavage initiation location in precracked specimens are explained, and the factors affecting cleavage initiation locations are analyzed. The change of the length of the active zone with applied load determines the distributions of cleavage initiation locations. With increasing temperatures, the distance X f from precrack tip to locations initiating cleavage fracture and its scatter increase, and the lower boundary of X f increases slowly, and the scatter is mainly caused by the rapid increase of the upper boundary. With decreasing the strength of the weakest constituent in steels and increasing their number, the minimum distance X \min and the average distance for initiating cleavage fracture will decrease and the maximum distance X \max will increase, and the corresponding toughness values will be decreased.
Similar content being viewed by others
References
Armstrong, R.W., Irwin, G.R. and Zhang, X.J. (1997). Microstructural mechanics description of cleavage fracture in polycrystals. Cleavage Fracture: George R, Irwin Symposium, The Minerals, Metals and Materials Society, Warrendale, PA, 51-58.
Beremin, F.M. (1983). A local criterion for cleavage fracture of a nuclear pressure vessel steel. Metallurgical Transactions 14A, 2277-2287.
Chen, J.H. and Wang, G.Z. (1999). On scattering of measured values of fracture toughness parameters. International Journal of Fracture 94, 33-49.
Chen, J.H. and Wang, G.Z. (1992). Study of mechanism of cleavage fracture at low temperature. Metallurgical Transactions A23A, 509-517.
Chen, J.H., Wang, G.Z., Yan, C., Ma, H. and Zhu, L. (1997a). Advances in the mechanism of cleavage fracture of low alloy steel at low temperature. Part II: Fracture model. International Journal of Fracture 83, 121-138.
Chen, J.H., Wang, G.Z, Yan, C., Ma, H. and Zhu, L. (1997b). Advances in the mechanism of cleavage fracture of low alloy steel at low temperature. Part III: Local fracture stress σf. International Journal of Fracture 83, 139-157.
Chen, J.H., Wang, G.Z. and Wang, H.J. (1996). A statistical model for cleavage fracture of low alloy steel. Acta Materials 44, 3979-3989.
Chen, J.H., Wang, G.Z., Wang, Z., Zhu, L. and Gao, Y.Y. (1991). Further study on the scattering of local fracture stress and allied toughness values. Metallurgical Transactions A 22A, 2287-2296.
Chen, J.H., Yan, C. and Sun, J. (1994). Further study on the mechanism of cleavage fracture at low temperature. Acta Metallurgica & Materials 42, 251-261.
Knott, J.F. and Boccaccini, A.R. (1999). The fracture mechanics-microstructure linkage. Mechanics and Materials: Fundamentals and Linkages. Wiley-Interscience, New York. Chapter 11, 399-427.
Lin, T., Enens, A.G. and Ritchie, R.O. (1986). Statistical analysis of cleavage fracture ahead of sharp crack and rounded notches. Acta Metallurgica 34, 2205-2216.
Mendiratta, M.G., Goetz, R.L. and Dimiduk, D.M. (1996). Notch Fracture in γ-titanuim aluminides. Metallurgical and Materials Transactions A 27A, 3903-3912.
McMeeking, R.M. (1977). Finited deformation analysis of crack-tip opening in elastic-plastic materials and implications for fracture. Journal of Mechanics and Physics Solids 25, 357-381.
Petch, N.J. and Armstrong, R.W. (1989). Work hardening in cleavage fracture toughness. Acta metallurgica 37, 2279-2285.
Ritchie, R.O., Knott, J.F. and Rice, J.R. (1973). On the relationship between critical tensile stress and fracture toughness in mild steel. Journal of Mechanics and Solids 21, 395-410.
Yokoyama, K. and Nagumo, M. (1998). Brittle fracture initiation associated with the strain localization in a heataffected zone of a low carbon steel. Metallurgical and Materials Transactions A 29A, 551-558.
Wallin, K. (1984). The scatter in K1c result. Engineering Fracture Mechanis 19, 1085-1093.
Wall, M., Lane, C.E. and Hippsley, C.A. (1994). Fracture criteria for hydrogen and temper embrittlement in 9Cr1Mo steel. Acta Metallurgica et Materialia 42, 1295-1309.
Wang, G.Z. and Chen, J.H. (1996). A comparison of fracture behavior of low alloy steel with different sizes of carbide particles. Metallurgical and Materials Transactions A 27A, 1909-1917.
Zhang, X.J. and Tregoning, R.L. (1999). The effect of carbide banding structure on fracture toughness of heavy section A533B steel. International Symposium on Steel for Fabricated Structures, ASM International, Materials Park, OH, 75-83.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wang, G., Chen, J. On locations initiating cleavage fracture in precracked specimens of low alloy steel and weld metal. International Journal of Fracture 108, 235–250 (2001). https://doi.org/10.1023/A:1011033208335
Issue Date:
DOI: https://doi.org/10.1023/A:1011033208335