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Indexed by:期刊论文

Date of Publication:2017-09-01

Journal:EUROPEAN JOURNAL OF MECHANICS A-SOLIDS

Included Journals:SCIE、EI、Scopus

Volume:65

Page Number:79-90

ISSN No.:0997-7538

Key Words:Fatigue crack growth; Cohesive zone model; Singular finite element; Plastic zone length; Variable amplitude cyclic loading; FEM

Abstract:Modelling fatigue crack growth under variable amplitude cyclic loading (VACL) remains challenging in engineering due to multiple damage/failure mechanisms and the difficulties in capturing stress state around the crack tip. Previous efforts have been devoted to develop appropriate models in which the plastic zone length (PZL) in front of crack was involved. However, the PZL can not be calculated accurately by using the existing numerical approaches. In this study, a new singular finite element which takes into account the fracture process zone (FPZ) located in front of the crack tip by using cohesive zone model (CZM) is introduced to study fatigue crack growth under VACL. The cohesive stresses are converted into nodal force of the singular element, and the PZL can be solved numerically by iteration. A few numerical examples have been worked out to demonstrate the proposed method, and it is shown that the fatigue life under VACL can be predicted accurately by using the developed method. (C) 2017 Elsevier Masson SAS. All rights reserved.