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- Title
Fatigue crack growth analysis of biaxially loaded hole‐edge cracks using boundary cracklet method (BCM).
- Authors
Ahmed, Talal; Yavuz, Abdulkadir; Turkmen, Halit S.
- Abstract
Fatigue crack growth (FCG) behavior of two symmetric cracks originating at different orientations from the outer periphery of a hole in an infinite plate under biaxial tension‐tension loading is presented using two‐dimensional boundary cracklet method. Symmetric precracks of known length and orientation are modelled as initial cracks, and biaxial traction is applied as a far‐field loading. The rate of FCG is computed using Walker's equation, whereas the direction of propagation of crack tip is predicted using the minimum strain energy density criterion. The parametric study is performed with various orientations of initial precracks, biaxiality stress ratios (λ), and stress ratios (R) to show their effects on FCG behavior. Results suggest that for equiaxial loading, the crack propagation direction depends upon the position and initial angle of the crack. Cracks tend to grow perpendicular to that stress which is dominant of the two applied stresses when the biaxiality ratio is not unity. Highlights: A 2D approach using Boundary cracklet method is used to analyze fatigue crack growth in elastic materials.Hole‐edge cracked infinite plate is analyzed under different conditions of biaxial fatigue loads.Walker's equation is used as crack growth model and minimum strain density (MSED) criterion is used to predict the direction of propagation.Effects of position and orientation of initial pre‐cracks on fatigue crack growth are analyzed.The parametric study is performed by using different biaxiality ratios and stress ratios.The accuracy of the method is established through different fatigue crack growth problems involving biaxial fatigue loading from the literature.
- Subjects
FATIGUE crack growth; CRACK propagation (Fracture mechanics); FRACTURE mechanics; STRAIN energy; ENERGY density
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2021, Vol 44, Issue 10, p2693
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13538