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Short crack opening and prediction of fatigue notch factor

✍ Scribed by Gregory M. Khazhinsky

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
416 KB
Volume
47
Category
Article
ISSN
0013-7944

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✦ Synopsis

Abstmct-A phenomenological model of fatigue threshold in which the effects of stress level and crack length are taken into account for the crack opening conditions is proposed. A critical size of the initiation crack of the mode I fracture is determined. Based on the model the dependence between lengths of fictitious and intrinsic cracks is discussed. Conditions of nonpropagating crack appearance near the notch root are shown. A maximum nonpropagating crack length and corresponding critical nominal stress are found. An approach to the prediction of fatigue notch factor under crack initiation or complete fracture is considered. The predicted results are compared with experimental data of a low-carbon steel.

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