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TECHNICAL PAPERS

Probabilistic Growth of Complex Fatigue Crack Shapes: Toward Risk Based Inspection Intervals for Railroad Tank Cars

[+] Author and Article Information
William T. Riddell

Structures and Dynamics Division, DTS-76, Volpe National Transportation Systems Center, 55 Broadway, Cambridge, MA 02142e-mail: Riddell@volpe.dot.gov

J. Mech. Des 123(4), 622-629 (Dec 01, 2000) (8 pages) doi:10.1115/1.1413470 History: Received December 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Initial notch and fatigue crack
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Experimentally observed crack lengths (a) a1 and (b) a2 plotted against cycles, N
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Experimentally observed crack length a2 plotted against corresponding observed crack length a1
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Crack front shapes predicted using FRANC3D
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FRANC3D predicted ΔK_ plotted against a_
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FRANC3D predicted crack lengths a1 and a2 plotted against corresponding generalized crack length a_
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Predicted crack growth rate (da_/dN) against a_
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Comparison between direct integration of governing crack growth equation and results from Markov chain models using different time steps
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Predicted cycles before transition l1 and l2 as a function of crack growth rate parameter. Average experimentally observed l1 and l2 values are shown for comparison.
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Effect of γr on l1 and l2
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Comparison between experimentally observed (symbols) and numerically predicted (solid lines) distribution of cycles before first transition for ρ=0.7, γs=1.0, and four different values of γr
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Comparison between experimentally observed (symbols) and numerically predicted (solid lines) distribution of cycles before first transition for ρ=0.7, γr=1.0, and four different values of γs
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Experimentally observed and numerically predicted l1 and l2

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