EVALUATION OF THE J-INTEGRAL RANGE OF FATIGUE-CRACK EMANATING FROM NOTCHES BY SIMPLE ESTIMATION FORMULAS

Citation
T. Yafuso et al., EVALUATION OF THE J-INTEGRAL RANGE OF FATIGUE-CRACK EMANATING FROM NOTCHES BY SIMPLE ESTIMATION FORMULAS, JSME international journal. Series A, mechanics and material engineering, 38(1), 1995, pp. 97-103
Citations number
26
Categorie Soggetti
Engineering, Mechanical","Material Science
ISSN journal
13408046
Volume
38
Issue
1
Year of publication
1995
Pages
97 - 103
Database
ISI
SICI code
1340-8046(1995)38:1<97:EOTJRO>2.0.ZU;2-6
Abstract
In a previous paper, the present authors discussed the path-integral e xpression of the J-integral range, DELTAJ, for short fatigue cracks em anating from notches, and showed that DELTAJ evaluated based on the cr ack-opening level was an appropriate parameter for characterizing the near-tip stress and strain fields. In this study, finite-element simul ations of fatigue crack growth from notches were conducted. The values of DELTAJ evaluated by the path-integral were compared with those est imated by El Haddad's simple estimation formula proposed for short fat igue cracks at notches, and with those estimated by Dowling's formula for deep cracks and by Cho's formula for short cracks at notches. The DELTAJ values evaluated by El Haddad's formula did not agree well with the values of DELTAJ evaluated by the path-integral. In contrast, the DELTAJ values evaluated by Dowling's formula based on the crack openi ng level agreed well with the DELTAJ values evaluated by the path-inte gral.