Abstract
Numerical and experimental studies of fatigue crack growth under both pure mode I and combined mode I and II were performed. A CT-like specimen with an additional hole for mixed-mode loading made from an Al-alloy D16CT1 was used. A 2D elastic-plastic FEM simulation of a growing fatigue crack allowed us to determine the value of the total plastic energy dissipation per cycle throughout the cyclic (reversed) plastic zone directly from the elastic-plastic stress and strain fields in the vicinity of a crack tip. According to the Klingbeil's theory, the total plastic energy dissipated ahead of a crack tip is related to the fatigue crack growth rate. To review this theory, experimentally observed fatigue crack growth rates were correlated to the computed energies for both straight and slant crack growth. Moreover, a comparison according to the conventional concept of an equivalent stress intensity factor is presented.
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