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Title: Estimation of stress intensity factors in tubular K-joints using direct and indirect methods
Authors: Shao, Y. B.
Lie, Seng Tjhen
Li, T.
Keywords: DRNTU::Engineering::Civil engineering::Structures and design
Issue Date: 2012
Source: Lie, S. T., Li, T., & Shao, Y. B. (2014). Estimation of stress intensity factors in tubular K-joints using direct and indirect methods. International journal of advanced steel construction, 8(1), 17-37.
Series/Report no.: International journal of advanced steel construction
Abstract: The stress intensity factors at the deepest point and at the crack ends of a surface crack in a tubular K-joint are calculated by direct and indirect methods. In the direct method, the surface crack is modelled explicitly. An automatic mesh generator is developed to produce a well-graded mesh around the crack region. This is achieved by using five types of elements. Thereafter, the stress intensity factors of a surface crack located anywhere along the weld toe at the joint intersection are calculated using the J-integral method. The computed values had been verified by experimental test results. In the indirect method, the stress intensity factors are estimated by the T-butt solutions used in conjunction with the stress concentration factors (SCFs) and degree of bending (DOB) of the uncracked tubular K-joint. In this study, a total of 1024 models, covering a wide range of geometrical parameters and crack shapes, have been selected and analyzed. Both approaches are able to produce a safe estimation of stress intensity factors at the deepest point of the surface crack. However, the indirect method is found to be extremely conservative; it overestimates the stress intensity factor values by as much as 190.4% (β=0.5, γ=30, τ=0.5, a/T=0.1, c/a=5) at the deepest point, and 390.7% (β=0.4, γ=30, τ=0.5, a/T=0.5, c/a=8) at the crack ends of the surface crack respectively
Rights: © 2012 Hong Kong Institute of Steel Construction Limited. This paper was published in International Journal of Advanced Steel Construction and is made available as an electronic reprint (preprint) with permission of Hong Kong Institute of Steel Construction Limited. The paper can be found at the following official URL: [].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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