Open AccessStudy on the shape change of crack growth rate curve under different forms of additional stress field
Author(s) -
Jing Wang,
Chun Song,
Xiaolin Shao
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1676/1/012235
Subject(s) - stress intensity factor , crack closure , crack growth resistance curve , materials science , stress field , growth rate , stress (linguistics) , stress concentration , paris' law , structural engineering , field (mathematics) , crack tip opening displacement , mechanics , composite material , fracture mechanics , mathematics , finite element method , geometry , engineering , physics , linguistics , philosophy , pure mathematics
In this paper, FRANC3D is used to simulate the fatigue crack growth process under different additional stress fields to explore the key mechanical parameters influencing the fatigue crack growth curve. For finite large plate model with penetrating crack, the crack growth rate is calculated under different forms and different values of applied load and additional stress coupling, the fatigue life curves, as well as crack growth rate curves and Pairs formulas under different applied loads are obtained. Through the analysis, the relationship between the additional stress field and the parameters in Pairs formula of crack growth rate is obtained. Because of the existence of the additional stress field, the stress intensity factor amplitude of crack tip changes, which is the root cause of the change of crack growth rate curve shape.