Reliability of Welded Structures Containing Fatigue Cracks

Author:

Lanning D.1,Shen M.-H. H.1

Affiliation:

1. Department of Aerospace Engineering, Applied Mechanics and Aviation, 328 Bolz Hall, 2036 Neil Avenue, The Ohio State University, Columbus, OH 43210-1276

Abstract

Abstract This study investigates the reliability of a cracked fillet welded T-joint typically found in offshore structures. A formulation for the aspect ratio (a/c) of a propagating semi-elliptical fatigue crack located at the toe of the weld is developed using Newman and Raju’s stress intensity factor for a cracked flat plate in conjunction with a weld magnification factor. The reliability in terms of fatigue lifetime is then calculated using the aspect ratio and Paris’s law of crack propagation with both fracture toughness and elastic-plastic failure criteria. The variation in crack aspect ratio in the T-joint is compared to that in a cracked flat plate, and examples are provided of reliability calculations for tension and bending loads.

Publisher

ASME International

Subject

Mechanical Engineering,Ocean Engineering

Reference18 articles.

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2. Dawes M. G. , 1974, “Fracture Control in High Yield Strength Weldments,” Welding Journal Research Supplement, Vol. 53, pp. 369S–379S369S–379S.

3. de Koning A. C. , HarstonJ. D., NaylerK. D., and OhmR. K., 1990, “Feeling Free Despite LBZ,” ASME JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING, Vol. 112, May, pp. 155–126.

4. D404, 1988, Unstable Fracture, Veritas Offshore Standards, Det Norske Veritas, Aug.

5. Finch D. M. , and BurdekinF. M., 1992, “Effects of Welding Residual Stresses on Significance of Defects in Various Types of Welded Joint,” Engineering Fracture Mechanics, Vol. 41, No. 5, pp. 721–735.

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Recent Developments on the Unified Fatigue Life Prediction Method Based on Fracture Mechanics and its Applications;Journal of Marine Science and Engineering;2020-06-11

2. Reliability of Structures Containing Short Cracks;Journal of Offshore Mechanics and Arctic Engineering;1999-08-01

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