How does the load ratio in fatigue affect fracture initiation?
In metals subjected to fatigue, the ratio of constant to cyclic loading affects the crack growth rate and the development of a plastic wake which forms around the crack tip. During the transition from fatigue crack growth to unstable fracture, this difference in prior plastic deformation affects the material's apparent initiation fracture toughness. We will use SALSA to observe elastic strains during high-cycle fatigue loading and infer the plastic wake development from the measured data via reconstructive finite element analysis. By relating this to fracture toughness measurements, we will determine the cause of observed differences in the toughness of metals after fatiguing at different stress ratios.
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COULES Harry; CABEZA Sandra; PIRLING Thilo; PROBERT Molly; SEOW Cui Er and TRUMAN Christopher. (2019). How does the load ratio in fatigue affect fracture initiation?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-258
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