Research on Mechanical Model and Fatigue Crack of Tubular Joint

2012 ◽  
Vol 446-449 ◽  
pp. 278-282
Author(s):  
Diao Yan
Keyword(s):  
Fatigue Crack ◽  
Mechanical Model ◽  
Tubular Joint

scholarly journals A mechanical model of fatigue crack propagation. Report 1

1985 ◽  
Vol 17 (8) ◽  
pp. 1037-1043
Author(s):  
G. P. Karzov ◽  
V. P. Leonov ◽  
B. Z. Margolin
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Mechanical Model

scholarly journals A mechanical model of fatigue crack propagation. Report 2

1985 ◽  
Vol 17 (8) ◽  
pp. 1044-1049
Author(s):  
G. P. Karzov ◽  
V. P. Leonov ◽  
B. Z. Margolin
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Mechanical Model

Research on Mechanical Model and Fatigue Crack of Tubular Joint

2012 ◽  
Vol 446-449 ◽  
pp. 278-282
Author(s):  
Diao Yan
Keyword(s):  
Mechanical Model ◽  
Fatigue Cracks ◽  
Axial Direction ◽  
Mechanical Analysis ◽  
Fatigue Tests ◽  
Computational Formula ◽  
Analysis Model ◽  
Mechanical Models ◽  
Tubular Joint ◽  
Intersection Line

When the tubular joint is under stress, the stressed conditions on the intersection line are rather complicated. This article proposes to establish a cylindrical coordinated system for the stress on a tubular joint with axial direction, radical direction and circumferential direction as directions of coordinate axis. The system resolves the stress on points of the line of intersection along those three directions and establishes a mechanical analysis model for the stress on the tubular joint based on that. Besides, with combination of conditions of fatigue cracks of tubular joint, effective tensile stress specific to I-shape cracks are put forward and relevant mechanical formula are deduced accordingly. By taking fatigue tests of tubular joints of CaoEJiang Bridge as examples, the article also works out the position of the maximum geometrical value of stress on the line of intersection of tubular joint with applications of mechanical models and computational formula presented in the paper and compares the position with the result of test to explain the result of test.

Fatigue Crack Growth Analyses of Offshore Structural Tubular Joint

1989 ◽  
Vol 111 (1) ◽  
pp. 49-55 ◽  
Author(s):  
H. C. Rhee
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Three Dimensional ◽  
Diagram Method ◽  
The North ◽  
Weld Toe ◽  
Tubular Joint

Fracture mechanics fatigue life estimation procedures have been developed for offshore structural tubular joints through analyzing a K-joint under the North Sea environment. The objective of this study was to establish reliable procedures for estimating the remaining fatigue life of a tubular joint with cracklike defects. The analysis approach was the utilization of fracture mechanics methods for fatigue crack growth and failure analyses. In this study, the fully mixed mode stress intensity factors of weld toe surface flaws of the K-joint, which were calculated through detailed three-dimensional finite element analyses, were used for fatigue crack growth simulation. For the failure analyses, the failure assessment diagram method was used to predict the conditions for brittle fracture during fatigue crack propagation. The loading conditions considered in the analyses are the brace axial force, in and out-of-plane bending, and torsion.

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