Analysis of Damage Tolerance of the Stiffened Structure Based on XFEM

• Published in: Journal of physics. Conference series Vol. 2101; no. 1; pp. 12027 - 12034
• Main Authors: Zhang, Juan, She, Wenming, Zhou, Wei, Yang, Wenya, Wei, Jicheng, Ma, Lanling
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2021
• Subjects: Damage tolerance; fatigue crack growth; fatigue intensity; fatigue life; XFEM
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2101/1/012027

Abstract 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.