Abstract
This study investigated the behaviors of short cracks in a single crystal Ni-base superalloy under the thermo-mechanical loading. The effect of temperature condition on the propagation behavior of short crack was discussed taking into account of crack closure. The experimental results indicated that the short crack growth rates under the higher temperature condition are remarkably higher than those under the lower temperature condition even if the crack closure and the temperature dependence on the deformation resistance take into consideration. Based on the crack propagation mechanism, the summation law of the crack propagation rates controlled with the mechanical and environmental factors was proposed to predict the fatigue short crack propagation rate. It was found that the experimental results can be predicted with good accuracy by the proposed method.
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