Abstract
The effect of residual stresses on surface fatigue crack propagation and fracture mechanics parameters of intersecting orthogonal cracks is discussed. Mutual influence of intersecting cracks and biaxiality affects the nonsingular parameters Txx and Tzz. At the same time, the effect on the stress intensity factor is negligible. Two-parameter fracture mechanics is employed for an analysis of fatigue crack propagation taking into account residual stresses. The final configuration of the crack front is close to the semi-elliptical configuration.
Highlights
A n analysis of propagation of surface cracks is considered in a number of publications [1,2,3,4,5], where the results of the experimental and numerical analysis of a flat semi-elliptical crack growth under cyclic loading are presented
The numerical method and the appropriate program realization are presented for the analysis of the surface crack growth in weld joint of a pipeline, including the calculation of changes in the crack front configuration due to action of the active cyclic loading, influence of no uniformly distributed residual stresses and the T-stress
The method on the basis of modified Foreman equation and program software for realization of gradual remeshing of the finite element model during incremental crack growth is developed. It is implemented for an numerical analysis of fatigue surface crack propagation in welded area of pipeline taking into account nonlinear distributed residual stress and constraint effect in the crack tip employing two-parameter fracture mechanics
Summary
A n analysis of propagation of surface cracks is considered in a number of publications [1,2,3,4,5], where the results of the experimental and numerical analysis of a flat semi-elliptical crack growth under cyclic loading are presented. The numerical method and the appropriate program realization are presented for the analysis of the surface crack growth in weld joint of a pipeline, including the calculation of changes in the crack front configuration due to action of the active cyclic loading, influence of no uniformly distributed residual stresses and the T-stress. It should be noted that the results of the mutual influence of intersecting perpendicular cracks on the parameters of fracture mechanics are not enough presented in the literature [6]. The analysis of mutual influence intersecting cracks on the values and distribution of singular (the stress intensity factor) and nonsingular (the T-stress) components of the stress field along the crack fronts of intersecting cracks are presented
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