✦ LIBER ✦

Statistical evaluation of fatigue crack propagation properties including threshold stress intensity factor

✍ Scribed by Akihiko Ohta; Isao Soya; Satoshi Nishijima; Michio Kosuge

Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 976 KB
Volume: 24
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(86)90265-1

No coin nor oath required. For personal study only.

✦ Synopsis

The relationship between fatigue crack propagation rate, da/dn, and range of stress intensity factor, AK, including threshold stress intensity factor, AK,,, is analyzed statistically. A non-linear equation, da/dn = C{(AK)m-(AKth)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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When these data are applied to the formula derived by M. A. Schroedl and C. W. Smith, the stress intensity factor K, can be calculated. Comparing this computed K, with that given by theoretical formula, we have found the error to be within t 5.20%. It is believed that the result of this test has met