Abstract
Titanium is suitable for the material of ship hull structures because of its high specific strength responding to highspeed demanding and high corrosion resistance in marine environment. In Japan, CP titanium plates have been already used for the structural members of fishing boats. However, there is no application of the structural members of merchant or government ships where the authorized standard is strict, because there is no suitable rule or recommendation for welded built-up titanium plate structures. Additionally, there is little research concerned with the fatigue strength of titanium fillet welded joints that are indispensable to ship structure. In this study, for promoting the development of titanium ships, the fatigue tests of butt-welded joints, transverse fillet welded joints and longitudinal fillet welded joints were carried out. As a result of mentioned above, the effectiveness of the fatigue strength of steel was investigated for designing on the safety judgment of titanium-welded joints. Good correlation was achieved between the fatigue test results obtained from three types of welded joint relevant to ships that fail from the weld toe, using a modified version of the equivalent stress defined in MIL-HDBK-5. Furthermore, similar results were obtained for base metal failure.
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References
US Military Standard, MIL-HDBK-5G, 1997.
Matsuoka K., Kobayashi Y.: Influence of maximum stress on fatigue crack initiation life of welded steel joints and notched steel plates, Welding in the World, 1999, vol. 42, no. 6, pp. 18–24.
202nd Research Section: Research Report about the fatigue design method for offshore structure and the quality of welded section, The Shipbuilding Research Association of Japan (1991). [In Japanese].
Matsuoka, Uemura, Kamata: Fatigue strength and improvement method of welded joint of aluminium A6N01 extruded alloy, Journal of the Society of Naval Architect of Japan, Vol. 176, 475, 1994. [In Japanese].
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Iwata, T., Matsuoka, K. Fatigue Strength of CP Grade 2 Titanium Fillet Welded Joint for Ship Structure. Weld World 48, 40–47 (2004). https://doi.org/10.1007/BF03266442
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DOI: https://doi.org/10.1007/BF03266442
IIW-Thesaurus keywords
- GTA welding
- Arc welding
- Gas shielded arc welding
- Titanium
- Shipbuilding
- Fatigue strength
- Mechanical properties
- Fatigue tests
- Mechanical tests
- Welded joints
- Stress distribution
- Residual stresses
- Measurement
- Crack initiation
- Weld toes
- Parent material
- Practical investigations
- Thickness
- Dimensions
- Size
- Comparisons
- Steels
- GMA welding