Ductile Crack as Trigger of Brittle Fracture in Steel
Publication: Journal of Structural Engineering
Volume 123, Issue 6
Abstract
Brittle fracture of structural steel members in buildings is generally triggered by a ductile crack initiated at a notched surface after undergoing a noticeable amount of plastic strain, as evidenced by structural damage in Kobe during the 1995 Hyogoken-Nanbu earthquake, as well as by large-scale fracture testing in laboratory. This study, based on fracture experiments and finite-element analyses, showed the conditions governing the initiation of such a ductile crack in conjunction with notch sharpness, material properties, and specimen size. Major findings are as follows. Ductile cracking is governed by three physical parameters, that is, averaged plastic strain in a notched section, peak stress triaxiality under the notch root, and uniform strain capacity pertinent to the material, in such a way that the strain at the onset of a ductile crack increases with the reduction in stress triaxiality and with the increase in uniform strain capacity. Their relations are established in an empirical formula. It is, furthermore, shown that size effect is not involved in the criterion for crack initiation.
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References
1.
Architectural Institute of Japan (AIJ). (1995a). Preliminary reconnaissance report of the 1995 Hyogoken-Nanbu earthquake—English edition, Tokyo, Japan.
2.
Architectural Institute of Japan (AIJ). (1995b). Fracture in steel structures during a severe earthquake, Tokyo, Japan (in Japanese).
3.
Bruneau, M., and Mahin, S. A.(1990). “Ultimate behavior of heavy steel section welded splices and design implication.”J. Struct. Engrg., ASCE, 116(8), 2214–2235.
4.
Chen, W. F. (1995). “Steel connection failures during the Northridge Earthquake.”Urban disaster mitigation, F. Y. Chen and M.-S. Shen, eds., Elsevier, New York, N.Y., 167–176.
5.
Kato, B., and Morita, K. (1969). “Brittle fracture of heavy-section steel members.”Trans. AIJ, Tokyo, Japan, (156), 1–10 (in Japanese).
6.
Kuwamura, H. (1996). “Fracture of steel welded joints under severe earthquake motion.”Proc., 11th World Conf. on Earthquake Engrg., Mexico.
7.
Kuwamura, H., and Akiyama, H. (1993). “Effects of cold-working on the critical strain of fibrous crack initiation.”J. Struct. Constr. Engrg., (454), 171–178 (in Japanese).
8.
Kuwamura, H., and Akiyama, H.(1994a). “Brittle fracture under repeated high stresses.”J. Constr. Steel Res., 29, 5–19.
9.
Kuwamura, H., and Akiyama, H. (1994b). “Size effect on fibrous crack initiation strain.”J. Struct. Constr. Engrg., (458), 119–125 (in Japanese).
10.
Kuwamura, H., and Matsumoto, Y. (1995). “Fracture resistance of 800-MPa high strength steel and its weld.”Proc., 4th Pacific Struct. Steel Conf., Singapore.
11.
Kuwamura Laboratory. (1995). Field survey report on structural damage during the 1995 Hyogoken-Nanbu Earthquake, School of Engrg., The Univ. of Tokyo, Japan (in Japanese).
12.
McClintock, F. A. (1968). “A criterion for ductile fracture by the growth of holes.”J. Appl. Mech., 363–371.
13.
Rolfe, S. T., and Egan, G. R. (1972). “Designing to prevent fracture in tall buildings.”Proc., ASCE-IABSE Int. Conf. on Plng. and Des. of Tall Build., 781–807.
14.
Skiles, J. L., and Campbell, H. H. III.(1994). “Why steel fractured in the Northridge Earthquake.”Welding J., 73(11), 67–71.
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Copyright © 1997 American Society of Civil Engineers.
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Published online: Jun 1, 1997
Published in print: Jun 1997
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