Abstract
A nonlinear fracture mechanics study was made on the low-cyle fatigue crack growth in SUS 304 stainless steel under tension-compression trapezoidal stress waves at 650°C. The high temperature low-cycle fatigue crack growth behavior was classified into two categories: cycle-dependent and time-dependent. The cycle-dependent crack growth rate correlated well with the cyclic J-integral, whereas the time-dependent crack growth rate was characterized by the integrated value of the modified J-integral, J', during tensile hold. Due to the interaction of the elastic and creep strains under small-scale creep conditions, the modified J-integral at tensil hold, J'hold, was much greater than that calculated on the assumption of the steady-state creep. This high value of J'hold accelerated crack growth. A parameter β was defined as a ratio of the tensile hold time to the period ttr, which characterized the transition from the small-scale creep to the large-scale creep. This parameter β was found useful in predicting the transition from the cycle-dependent crack growth to the time-dependent crack growth.
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