BRITTLE FRACTURE INITIATION CHARACTERISTICS OF A THREE-DIMENSIONAL WELDED STRUCTURE CONTAINING A CRACK

In welded structures such as a ship and bridge etc. the fatigue cracks which initiate from the parts of stress concentration due to structural discontinuity can be an origin of brittle fracture under some conditions. In this paper, the theoretical and experimental analysis for the brittle fracture initiation characteristics from the cracks which are located along the toe of the fillet weld of the stiffener to the main plate have been made by using three-dimensional structural models. The following conclusions are obtained from the results: 1. The models with low cycle fatigue crack showed higher toughness than that of the model with machined notch in the case of brittle fracture at low stress level. 2. The brittle fracture stress for the structure with longitudinal stiffener containing a crack along the toe of filet weld, can be evaluated by taking account of the stress concentration due to the stiffener. 3. Effect of the plastic constraints caused by transverse or longitudinal continuous stiffener on the brittle fracture initiation characteristics after general yielding can hardly been found for the model with a crack at the fillet welds. However, the effect can be found only for the model with a notch at the root of discontinuous stiffeners.

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    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 
  • Authors:
    • Kanazawa, T
    • Ikeda, K
    • Yajima, H
    • Hino, T
    • SAKAI, K
    • Aoki, M
    • Yao, T
    • Shirakura, T
  • Publication Date: 1973-12

Language

  • Japanese

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Filing Info

  • Accession Number: 00072632
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM