- 期刊
- OpenAccess
Kinking Angle of Fatigue Crack with Defense Hole
摘要
By extending Bückner's superposition principle and alternating iteration method, crack-hole interactions are investigated in this presentation. In addition, crack initiation angles with differently located defense (auxiliary) holes are also evaluated due to the disturbance of hole; in such arrangements fatigue re-initiation life may be lengthened eventually. In this calculation, owing to energy balance of Bückner's superposition principle, a newly developed numerical scheme is embedded with the conventional Gauss-Chebyshev quadrature routine for evaluating the boundary integral possessing stress singularities. Due to this developed scheme, numerical singularity is avoided and the achieved stress field can be almost exact as that of analytical solution i.e., while the Gaussian integration points are once chosen to be a large amount. Because of the precise stresses evaluated in the evolution of stress field of crack-hole interacting, fatigue re-initiation angles for diversely located holes are predicted, that may re-direct crack propagation tendency towards the desired path of designed stop-hole. Eventually a controllable stress field of crack-hole interaction in cracked skin panel of airplane can be achieved.