Ductile Crack Propagation Characteristics in Steel Thin Single Edge Notched Tension Specimens

Abstract:

Article Preview

Static and dynamic ductile crack propagation tests were carried out using thin single edge notched tension (SENT) specimens of carbon-manganese steel, each of which had a fatigue pre-crack or a sharp V-notch as a crack initiator. The crack tip opening angle (CTOA) was measured using digital images on the surface of the SENT specimens, and the critical values of CTOA for crack propagation decreased with increasing crack length while initial crack growth was still small. After the initial crack growth up to the distance of the specimen thickness, the critical CTOA remained almost constant. These tendencies were common in static and dynamic crack propagation specimens as well as fatigue pre-cracked and sharp V-notched specimens. There was no particular difference in the static crack propagation characteristics of both fatigue pre-cracked and sharp V-notched specimens. On average, it was observed that higher crack speeds affected the constant values of the critical CTOA by slightly reducing them. The constant CTOA tends to decrease with an increasing global constraint factor, and this suggests that the factor is insensitive to a crack starter, fatigue pre-crack or a sharp V-notch, but relatively sensitive to crack speed.

Info:

Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

2180-2185

Citation:

Y. Kayamori et al., "Ductile Crack Propagation Characteristics in Steel Thin Single Edge Notched Tension Specimens", Materials Science Forum, Vols. 539-543, pp. 2180-2185, 2007

Online since:

March 2007

Export:

Price:

$38.00

[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 No. 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 Issues 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 Issue 1 (1997), p.11.

[7] K. Kawata, S. Hashimoto, N. Takeda and S. Sekino: ASTM STP 864 (1985), p.700.

[8] M. Toyosada, K. Gotoh and K. Sagara: J. SNAJ Vol. 170 (1991), p.651.

[9] Y.A. Çengel: Heat transfer - a practical approach, Fourth edition (McGraw-Hill 1998).

[10] The Japan Welding Engineering Society: WES 2805-(1997).

[11] A.R. Rosenfield and G.T. Hahn: Trans. ASM Vol. 59 (1966), p.962.

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

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