This paper describes the mode mixity of stress-intensity factors for surface cracks at weld toes located at the saddle point in circular hollow section joints. The remote loading applies a uniform tensile stress at the end of the brace along its axis. The three-dimensional finite element models employ mesh tieing between a topologically continuous, global mesh and a separate, local crack-front mesh. Analyses of a simple plate model that approximates key features of toe cracks at the brace-chord intersection verify the negligible effects of the recommended mesh-tieing scheme on stress intensity factors. The linear-elastic analyses compute the mixed-mode stress intensity factors along the crack front using an interaction-integral approach. The mixed-mode stress intensity factors indicate that the crack front experiences predominantly mode I loading, with near the deepest point on the front . The total crack driving force, described by the integral, reaches a maximum value at the deepest point of the crack for the crack aspect ratio considered here. The mode-mixity angle, , at is compared for a range of practical X-joint configurations and crack-depth ratios. The present study demonstrates that the mode-mixity angle increases with increasing brace-to-chord diameter ratio and decreasing chord radius to wall thickness ratio . Values of the nondimensional stress intensity factors ( and ), however, show an opposite trend, with higher crack driving forces for small and large ratios. The variations in the brace-to-chord wall thickness ratio and the crack depth ratio do not generate significant effects on the mode mixity.
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August 2005
Technical Papers
Mode Mixity for Circular Hollow Section Joints With Weld Toe Cracks
X. Qian,
X. Qian
Department of Civil and Environmental Engineering,
University of Illinois
, Urbana, IL 61801, U.S.A.
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Robert H. Dodds, Jr.,
Robert H. Dodds, Jr.
Department of Civil and Environmental Engineering,
University of Illinois
, Urbana, IL 61801, U.S.A.
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Y. S. Choo
Y. S. Choo
Center for Offshore Research and Engineering,
National University of Singapore
, Singapore 117576
Search for other works by this author on:
X. Qian
Department of Civil and Environmental Engineering,
University of Illinois
, Urbana, IL 61801, U.S.A.
Robert H. Dodds, Jr.
Department of Civil and Environmental Engineering,
University of Illinois
, Urbana, IL 61801, U.S.A.
Y. S. Choo
Center for Offshore Research and Engineering,
National University of Singapore
, Singapore 117576J. Offshore Mech. Arct. Eng. Aug 2005, 127(3): 269-279 (11 pages)
Published Online: January 26, 2005
Article history
Received:
August 21, 2004
Revised:
January 26, 2005
Citation
Qian, X., Dodds, R. H., Jr., and Choo, Y. S. (January 26, 2005). "Mode Mixity for Circular Hollow Section Joints With Weld Toe Cracks." ASME. J. Offshore Mech. Arct. Eng. August 2005; 127(3): 269–279. https://doi.org/10.1115/1.1951771
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