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Fatigue crack propagation behaviour under variable amplitude loading with different frequency components is highlighted. Numerical simulation of the fatigue crack propagation based on an advanced frac...ture mechanics approach with the RPG (Re-tensile Plastic zone Generating) load criterion is is improved to extract the effective loading sequence for the fatigue crack growth.
The critical value of plastic work, which corresponds to the plastic hysteresis of stress versus strain relation consuming in the vicinity of a crack tip, is defined as the control parameter to extract the effective loading sequences for the crack propagation. Comparison of fatigue crack growth curves obtained from the numerical simulations with the measurements under the constant amplitude loadings superimposing small constant amplitude components with high frequency and the damping amplitude loadings superimposing small damping amplitude components with high frequency are performed. These comparisons conduct the validity of proposed treatment of extracting the effective loading sequences for the fatigue crack propagation from random loading sequences.続きを見る
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