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Statistical evaluation of fatigue crack propagation properties including threshold stress intensity factor |
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| Authors: | Akihiko Ohta Isao Soya Satoshi Nishijima Michio Kosuge |
| Affiliation: | † Fatigue Testing Division, National Research Institute for Metals, 2-3-12, Nakameguro, Meguro-ku, Tokyo 153, Japan ‡ Plate, Bar, Shape and Wire Rod Laboratory, Nippon Steel Corporation, 5-10-1, Fuchinobe, Sagamihara, Kanagawa-ken 229, Japan |
| Abstract: | The relationship between fatigue crack propagation rate, da/dn, and range of stress intensity factor, ΔK, including threshold stress intensity factor, ΔKth, is analyzed statistically. A non-linear equation, da/dn = C{(ΔK)m-(ΔKth)m}, is fitted to the data by regression method to evaluate the 99% confidence intervals. Several experimental results on fatigue crack propagation properties of welded joints are compared by using these confidence intervals. |
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