Brittle Crack Propagation/Arrest Behavior in T-Joint Structure of Heavy Gauge Steel Plates

Abstract:

Brittle crack arrestability is extremely important in welded joints of heavy gauge steel plates used in large container ships. Recently, much attention has been focused on potential crack propagation along welds using large heat input. This paper examines the application of a T-joint to the strength deck structure of container ships to enhance crack arrestability. The crack arrest toughness, Kca, for crack arrest was varied. The ESSO test of T-joint components showed that brittle crack was arrested at the T-joint if the steel plate used for the flange had a high Kca value in the range from 4900 to 7300N/mm^3/2. FE-analysis of the stress intensity factor K indicated that brittle crack propagation was arrested under the condition that the K-value at the running crack tip was less than the Kca of the material. In the T-joint, it was noted that the K-value around the area of the deepest point of the crack decreased and was finally less than the Kca of the flange plate when the brittle crack penetrated suddenly into the flange plate to a 10mm depth. This phenomenon shows the advantage of using a T-joint for brittle crack arrest in the flange plates of strength deck structures.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 914-919
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.914
• Online since: January 2012
• Authors: Tsunehisa Handa, Kimihiro Nishimura, Hiroshi Shiomi, Seishi Tsuyama
• Keywords: Brittle Fracture, Crack Arrestability, Thick Plate, Welded Joint

References

[1] N. Kiji, Y. Nakajima and T. Yokura: JSSC, 58(2005), 13. (in Japanese).

[2] The 193rd Research Committee (SR193 Committee. 1985): Application of 50kgf/mm2 class high strength steel plates made by new steel manufacturing process, Report No. 100, The Shipbuilding Research Association of Japan. (in Japanese).

[3] S. Machida and M. Aoki: Some Basic Considerations on Crack Arresters for Welded Steel Structures (The 7th Report) with Special Reference to Arrest of an Extremely Long Crack and the Design of Crack Arresters, Journal of the Society of Naval Architects of Japan, 131(1972).

DOI: 10.2534/jjasnaoe1968.1972.367

[4] T. Kanazawa, S. Machida, H. Yajima and M. Aoki: Study on Brittle Crack Arrester, The Journal of the Society of Naval Architects of Japan, Selected Papers, 11(1973), 135-147.

[5] T. Kanazawa, S. Machida and T. Teramoto: Preliminary Approaches to Experimental and Numerical Study on Fast Crack Propagation and Crack Arrest, ASTM STP 627, (1977), 39-58.

DOI: 10.1520/stp27379s

[6] T. Fukui, H. Kitada, M. Tada, K. Hirota and T. Ishikawa: Arrestability Requirement for Crack Arrester in Hull Structure, JHPI, 41-6(2003), 303-314. (in Japanese).

[7] The 147rd Research Committee (SR147 Committee. 1978): Evaluation of Brittle Fracture Toughness of Welded Joints of Ship under High Welding Heat Input, Report No. 87, The Shipbuilding Research Association of Japan. (in Japanese).

[8] H. Shiomi: KANRIN, 3(2005), 10-15. (in Japanese).

[9] K. Yamaguti, H. Kitada, H. Yajima, K. Hirota and H. Shirakihara: KANRIN, 3(2005), 70-76. (in Japanese).

[10] T. Inoue, T. Ishikawa, S. Imai, T. Koseki, K. Hirota, M. Tada, H. Kitada, Y. Yamaguchi and H. Yajima: Long Crack Arrestability of Heavy-Thick Shipbuilding Steels, ISOPE-2006, 132-136.

[11] Nippon Kaiji Kyokai: Guidelines on Brittle Crack Arrest Design, (2009), 4-8.

[12] L.B. Freund: Crack Propagation in an Elastic Solid Subjected to General Loading-I Constant Rate to Extension, J. Mech. Phys. Solids, 20-3 (1972), 129.

DOI: 10.1016/0022-5096(72)90006-3