The existence of the unified local strain field where we can substantially combine the two fatigue stages, crack initiation and propagation, was experimentally confirmed. Using the fine-grid-method, the changes of local notch-root or crack-tip strain and these histories were investigated until the small elemental block of material was broken by crack initiation and propagation. It became clear that the crack-tip strain behavior and its fracture process showed the similarity with local strain damage accumulation on crack initiation process. Especially, when the local strain history in the “elemental size, ρ*” adjacent to the crack-tip was taken into account, very good agreement of two stages could be obtained, ρ* depended on the kind of material. Based on this result, we have proposed a new idea termed “local crack-tip strain concept” that has the possibility for more simple, one parameter approach for future fatigue life analysis. It qualitatively differs from the currently used macroscopic, two parameters approach by combining the gross-strain (Δεtotal) fatigue life curve and fracture mechanics parameter (ΔK).
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April 1987
Research Papers
Local Crack-Tip Strain Concept for Fatigue Crack Initiation and Propagation
Heihachi Shimada,
Heihachi Shimada
Department of Metal Processing and Mechanical Metallurgy, Tohoku University, Sendai 980, Japan
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Yasubumi Furuya
Yasubumi Furuya
Department of Metal Processing and Mechanical Metallurgy, Tohoku University, Sendai 980, Japan
Search for other works by this author on:
Heihachi Shimada
Department of Metal Processing and Mechanical Metallurgy, Tohoku University, Sendai 980, Japan
Yasubumi Furuya
Department of Metal Processing and Mechanical Metallurgy, Tohoku University, Sendai 980, Japan
J. Eng. Mater. Technol. Apr 1987, 109(2): 101-106 (6 pages)
Published Online: April 1, 1987
Article history
Received:
April 29, 1985
Online:
September 15, 2009
Citation
Shimada, H., and Furuya, Y. (April 1, 1987). "Local Crack-Tip Strain Concept for Fatigue Crack Initiation and Propagation." ASME. J. Eng. Mater. Technol. April 1987; 109(2): 101–106. https://doi.org/10.1115/1.3225947
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