Crack length and closure are monitored simultaneously and countinuously in terms of the testing by a PC-aided unloading elastic compliance technique. The relation between the crack opening stress intensity factor and crack length is determined from th...
Crack length and closure are monitored simultaneously and countinuously in terms of the testing by a PC-aided unloading elastic compliance technique. The relation between the crack opening stress intensity factor and crack length is determined from the experimental results. The crack opening stress intensity factor of short cracks, K_op, can be predicted from the crack opening stress intensity factor of near threshold of long crack, K_op.L. The growth rate of short cracks at notch root can be predicted from the crack opening stress intensity factor of short cracks, K_op, and the growth equation of long cracks in region Ⅱ.