MODELING THE INITIATION AND PROPAGATION OF FATIGUE CRACKS IN WELDED STEEL STRUCTURES

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Authors
  1. Lambert, S.B.
  2. Glinka, G.
  3. Yee, R.D.
Corporate Authors
Waterloo Univ, Waterloo ONT (CAN) Dept of Mechanical Engineering;Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
In recent years, classification societies and naval design authorities have introduced explicit fatigue design criteria for welded structural details in merchant and naval ships. These criteria, which are largely based on well-established fatigue design procedures for welded joints in bridges and offshore structures are intended to ensure that there is a low probability of fatigue failures occurring during the design life of a ship, where failure is generally considered to be the initiation of a through-thickness crack several inches long. However, premature fatigue cracking as a result of fabrication or design errors can still occur. Furthermore, some fatigue cracking can still be expected in properly designed and fabricated ships. Therefore, quantitative techniques for predicting the residual life and residual strength of cracked structural welded details are needed to develop safe but cost-effective inspection schedules at the design stage. These techniques could also be used to optimize the scheduling of repairs for cracks found in service, to assess whether the operation of existing ships can be extended beyond their original design lives, and to assess the relative effects of environment and detail configuration on fatigue performance. TRUNCATED
Report Number
DREA-SR-97-002-PAP-40 — CONTAINED IN 98-00986
Date of publication
01 Oct 1997
Number of Pages
20
DSTKIM No
98-01026
CANDIS No
507243
Format(s):
Hardcopy;Document Image stored on Optical Disk

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