Ductile Crack Propagation Characteristics in Thin Steel Tubes


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Static ductile crack propagation tests were conducted using two pressurised thin carbon-manganese steel tube specimens, and the crack tip opening angle (CTOA) was measured using digital images captured on specimen surface. The critical values of CTOA for static crack propagation decreased with crack extension while propagating crack was short. After the crack grew up to the distance of the tube specimen thickness, the critical CTOA exhibited nearly constant. These tendencies were the same as those of referential data in the thin single edge notched tension (SENT) specimens of the same tubes. Using the data of both tube specimens and SENT specimens, it was noted that the higher crack velocities slightly reduced the constant CTOA. A global constraint factor was calculated for each tube specimen, and the constant CTOA decreased with the increase of the global constraint factor. In addition, a dynamic ductile crack propagation test of a tube specimen was carried out, and a crack velocity was measured. The estimation of the constant CTOA for dynamic crack propagation in the tube specimen was performed by using the crack velocity.



Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie




Y. Kayamori et al., "Ductile Crack Propagation Characteristics in Thin Steel Tubes", Key Engineering Materials, Vols. 353-358, pp. 248-253, 2007

Online since:

September 2007




[1] A.S. Kobayashi, A.F. Emery, W.J. Love. Y.H. Chao and O. Johansson: ASTM STP 969 (1988), p.441.

[2] J.C. Newman Jr., C.E. Harris, R.S. Piascik and D.S. Dawicke: NASA/TM-1998-208975 (1998).

[3] D.S. Dawicke and M.A. Sutton: Exp. Mech. Vol. 34 (4) (1994), p.357.

[4] D.S. Dawicke, M. Sutton, J.C. Newman and C.A. Bigelow: ASTM STP 1220 (1995), p.358.

[5] J. Heerens and M. Schödel: Eng. Frac. Mech. Vol. 70(3-4) (2003), p.417.

[6] P.E. O'Donoghue, M.F. Kanninen, C.P. Leung, G. Demofonti and S. Venzi: Int. J. Pres. Ves. & Piping Vol. 70 (1) (1997), p.11.

[7] J.C. Newman Jr., C.A. Bigelow and K.N. Shivakumar: Eng. Frac. Mech. Vol. 46 (1) (1993), p.1.

[8] J.C. Newman Jr., M.A. James and U. Zerbst: Eng. Frac. Mech. Vol. 70 (3-4) (2003), p.371.

[9] Y. Kayamori, S. Hillmansen, P.S.J. Crofton and R.A. Smith: Mater. Sci. Forum, in the press (2006).