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Influence of stress state on high cycle fatigue of notched Ti-6Al-4V specimens

✍ Scribed by David B. Lanning; George K. Haritos; Theodore Nicholas

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 258 KB
Volume: 21
Category: Article
ISSN: 0142-1123
DOI: 10.1016/s0142-1123(99)00059-6

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✦ Synopsis

The high cycle fatigue (HCF) notch size effect is investigated for Ti-6Al-4V flat dogbone specimens with two notch sizes, each having an elastic stress concentration factor of K t =2.72. Points were generated on a constant life Haigh diagram using a step-loading technique. The notch size effect is compared with previous results obtained from circumferentially notched cylindrical specimens in terms of the biaxial state of stress at the notch root and von Mises effective stress. Within the range of dimensions tested, there is limited dependence of the fatigue limit upon the notch root radius. Stresses at the notch root and the fatigue notch factor are examined as a function of uniaxial stress, effective stress, notch plasticity, and notch root radius.

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