Fatigue-damage-induced cohesive zone model derived from Paris law and its parameter identification

The objective of this study is to develop a new cohesive zone model derived from Paris law and identification of its material parameters to realize fatigue crack propagation. A damage variable representing material degradation under cyclic loading is introduced into an existing cohesive zone model w...

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Published inTransactions of the Japan Society for Computational Engineering and Science Vol. 2019; p. 20190013
Main Authors SHINTAKU, Yuichi, FUJIWARA, Takaki, TAKAHASHI, Akiyuki
Format Journal Article
LanguageJapanese
Published JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE 23.08.2019
Subjects
Cohesive Zone Model
Crack Propagation Analysis
Fatigue Fracture
Paris Law
Plasticity
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Summary:The objective of this study is to develop a new cohesive zone model derived from Paris law and identification of its material parameters to realize fatigue crack propagation. A damage variable representing material degradation under cyclic loading is introduced into an existing cohesive zone model within the framework of thermodynamics and the evolution law is determined from Paris law. After simple validation is conducted to investigate the effect of the material parameters on crack growth rate, we present the parameter identification to employ the material parameters of Paris law on our proposed model. Several numerical examples are provided to demonstrate the consistency assessment of the proposed model with previous studies, and the capability for problems of fatigue crack propagation affected with different plastic deformation.
ISSN:1347-8826
DOI:10.11421/jsces.2019.20190013