A mathematical model to predict geometry magnification factor for stress intensity factor of butt welded joints
- Univ. of Adelaide, South Australia (Australia). Dept. of Mechanical Engineering
An approximate mathematical expression of geometry magnification factor (M{sub k}) for stress intensity factor subjected to various butt weld profile geometry parameters was derived by using Linear Elastic Fracture Mechanics (LEFM), Finite Element Analysis (FEA) and Dimensional Analysis Techniques (DAT). It has been found that the effect of plate thickness on stress intensity factor and on fatigue strength of butt welded joints is less significant than that of other weld geometry parameters such as flank angle and weld toe radius. The effect of plate thickness on stress intensity factor is significant only at very small crack length of the order of 0.025 times plate thickness while weld toe radius and flank angle affect stress intensity factor at crack length of the order of 0.05 and 0.15 times plate thickness respectively. The strong effect of plate thickness on fatigue strength of butt welded joints known from literature is revealed as the co-influence effect of plate thickness with other weld geometry parameters such as weld toe radius, flank angle and plate-edge preparation angle. The predicted values of M{sub k} agreed well with that calculated by using Bueckner`s weight function and superposition principle. The calculated values of fatigue strength of butt welded joint using the equations developed for M{sub k} agreed well with the available data from literature.
- OSTI ID:
- 445293
- Report Number(s):
- CONF-940367--; ISBN 0-87171-441-8
- Country of Publication:
- United States
- Language:
- English
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