Stress Intensity Factor Solutions of Integral Stiffened Panels Based on an Improved Displacement Compatibility Method

Abstract

Stiffnend panels are used to investigate the fracture behavior of the fuselage components within the framework of the damage tolerance analysis. Integral structure are gradually replace butilt-up structure in recent years. This paper presents an improved method based on displacement compatibility principle to calculate stress intensity factors. A finite element method based on intgral contour is introduced and used for verifying the solutions. Stress intensity factor solutions of built-up structure and integral structure were both calculated using these two methods. From the comparison, these two solutions are in good agreement both in built-up structure and integral structure.