Open AccessAnalysis of Damage Tolerance of the Stiffened Structure Based on XFEM
Author(s) -
Juan Zhang,
Wenming She,
Wei Zhou,
Wenya Yang,
Jicheng Wei,
Lanling Ma
Publication year - 2021
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 - 10.1088/1742-6596/2101/1/012027
Subject(s) - structural engineering , stress intensity factor , finite element method , amplitude , extended finite element method , intensity (physics) , slab , damage tolerance , stress (linguistics) , materials science , engineering , composite material , physics , optics , linguistics , philosophy , composite number
A calculation method of damage tolerance of stiffened structure based on extended finite element method (XFEM) is proposed.The crack propagation process is divided into small intervals to calculate the amplitude of stress intensity factor of the structure under different crack lengths. Each small interval is integrated to calculate the crack growth life. The accuracy of the method is verified by calculating the stress intensity factor, the load at both ends and crack growth life. The flat slab structure model with different numbers of stiffeners is established. The above calculation method shows that the stiffeners can share the load for the structure, reduce the amplitude of stress intensity factor, increase the fatigue life.The more the number of stiffeners, the more obvious the improvement effect. The equivalent treatment of the stiffened structure was conducted, and the equal area widening model, unfolding model and thickening model were established. The calculation results show that the calculation results of expansion model is very close to the stiffened structure. It shows that the stiffeners share the load for the structure by increasing the local thickness of the area, reduce the amplitude of stress intensity factor and improve the fatigue intensity.