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- Title
Fatigue limit evaluation of notches, small cracks and defects: an engineering approach.
- Authors
LIVIERI, P.; TOVO, R.
- Abstract
In this paper, the average stress method for the fatigue limit evaluation of stress raising geometrical features is revised and extended. In particular, an analytical close-form approach was used and the linear elastic stress equations were modified by taking into account the effect of nominal stress on the local stress distribution. Hence, the average tangential stress was correctly evaluated over a distance of 2a0, wherea0 was El Haddad's short crack constant, for long and small notches as well as for crack-like notches. When this model is applied to a wide range of geometrical features subjected to mode I fatigue loading, the classical shape of the curves of the Kitagawa–Takahashi diagram was obtained for changes in crack-like notch size. Similarly, notch sensitivity was estimated by reducing the notch tip radius. The accuracy of the proposed method in predicting fatigue limits was then checked by using experimental data taken from the literature and generated on testing specimens weakened by rounded and sharp notches as well as by small artificial defects.
- Subjects
FATIGUE testing machines; CRACKING of welded joints; STRESS concentration; JOINTS (Engineering); STRAINS &; stresses (Mechanics); METAL fatigue
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2004, Vol 27, Issue 11, p1037
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2004.00816.x