✦ LIBER ✦

Near-threshold fatigue crack propagation of several high strength steels

✍ Scribed by T.L. Mackay; B.J. Alperin; D.D. Bhatt

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 704 KB
Volume: 18
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(83)90149-2

No coin nor oath required. For personal study only.

✦ Synopsis

In support of Douglas Aircraft Co. structural damage tolerance analysis, crack propagation rates were measured in humid air from lo-* to 10m3 mm/cycle of several high strength martensitic steels at stress ratios of R = 0.1 and R = 0.5. Increasing the stress ratio was found to decrease the threshold stress intensity. Increasing the tensile yield material strength in these quench and tempered steels resulted in a nearly linear inverse relationship with the threshold stress intensity. The threshold stress intensity appeared to be independent of the fracture toughness of the alloy steel.

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