Predicting the fatigue life and crack aspect ratio evolution in complex structures |
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| Authors: | C. Wallbrink D. Peng R. Jones P.H. Dayawansa |
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| Affiliation: | aDepartment of Mechanical Engineering, DSTO Centre of Expertise in Structural Mechanics (CoE-SM), Monash University, P.O. Box 31, Victoria 3800, Australia;bDepartment of Mechanical Engineering, Maintenance Technology Institute, Monash University, P.O. Box 31, Victoria 3800, Australia;cRail CRC, Department of Mechanical Engineering, Monash University, P.O. Box 31, Victoria 3800, Australia |
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| Abstract: | This paper discusses a computationally efficient method for determining the behaviour of complex structures containing three-dimensional cracks. A simple method is presented for calculating the mode I stress intensities for semi-elliptical cracks emanating from the saddle point of two intersecting tubular members. This method, which gives results in good agreement with published values, uses the finite element technique, but does not require the crack to be modelled explicitly. The technique is then used, in conjunction with FASTRAN II, to study fatigue crack growth and the results are compared to experimental data. Good agreement is achieved between both the predicted and measured fatigue crack growth and the evolution of the crack aspect ratios. |
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| Keywords: | Fatigue life Crack growth Crack evolution Semi-analytical Indirect Aspect ratio Complex structures |
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