Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 23, Issue 10, Pages 903-910Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0142-1123(01)00051-2
Keywords
random loading; elastic-plastic finite element analysis; local stress-strain field intensity; fatigue damage; life prediction
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According to the characteristic of the local behavior of fatigue damage, on the basis of stress field intensity approach, a theory of local stress-strain field intensity for fatigue damage at the notch is developed in this paper, which can take account of the effects of the local stress-strain gradient on fatigue damage at the notch. In order to calculate the local stress-strain field intensity parameters, an incremental elastic-plastic finite element analysis under random cyclic loading is used to determine the local stress-strain response. A local stress-strain field intensity approach to fatigue life prediction is proposed by means of elastic-plastic finite element method for notched specimens. This approach is used to predict fatigue crack initiation life, and good correlation was observed with U-shape notched specimens for normalized 45 steel. (C) 2001 Elsevier Science Ltd. All rights reserved.
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