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.
Skip Nav Destination
Article navigation
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.
Search for other works by this author on:
Robert H. Dodds, Jr.,
Robert H. Dodds, Jr.
Department of Civil and Environmental Engineering,
University of Illinois
, Urbana, IL 61801, U.S.A.
Search for other works by this author on:
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
Download citation file:
Get Email Alerts
Numerical Modeling of Fish Cage Structural Responses in Regular and Irregular Waves Using Modified XPBD
J. Offshore Mech. Arct. Eng (April 2025)
Layout Optimization of Wave Energy Park Based on Multi-Objective Optimization Algorithm
J. Offshore Mech. Arct. Eng (August 2025)
Effects of Aerodynamic Damping and Gyroscopic Moments on Dynamic Responses of a Semi-Submersible Floating Vertical Axis Wind Turbine: An Experimental Study
J. Offshore Mech. Arct. Eng (April 2025)
Investigating the Impact of System Parameters on Flow-Induced Vibration Hard Galloping Based on Deep Neural Network
J. Offshore Mech. Arct. Eng (August 2025)
Related Articles
A Combination Rule for Circumferential Surface Cracks on Pipe Under Tension Based on Limit Load Analysis
J. Pressure Vessel Technol (April,2011)
Analysis of Surface Crack in Cylinder by Finite Element Alternating Method
J. Pressure Vessel Technol (May,2005)
Finite-Element Modelling of Multi-Planar Offshore Tubular Joints
J. Offshore Mech. Arct. Eng (February,2004)
A Criterion for Combination Rule in Flaw Assessment of Parallel Surface Cracks
J. Pressure Vessel Technol (December,2011)
Related Proceedings Papers
Related Chapters
Three-Dimensional Cracked Configurations
The Stress Analysis of Cracks Handbook, Third Edition
Measurements of CTOD and CTOA Around Surface-Crack Perimeters and Relationships Between Elastic and Elastic-Plastic CTOD Values
Surface-Crack Growth: Models, Experiments, and Structures
Propagation of Surface Cracks in Notched and Unnotched Rods
Surface-Crack Growth: Models, Experiments, and Structures