Abstract
Experimental results are presented for time-dependent crack growth obtained from load-hold testing at room temperature. The test are carried out over a wide range of loading rates before load holding, which includes a high rate as well as a low rate. First, it is shown that when the load is applied with a high rate, the threshold value of load holding for ductile instability is not limited to values near the maximum load as reported so far, but decreases. Next, the condition is clarified for the transition of time-dependent crack growth from stable to unstable. Then the incipient point of the transition is studied, where the incipient point is defined as a point from which the rate of the crack-mouth opening displacement increases. It is found that the incipient point occurs when the macroscopic deformation of the specimen under a constant loading attains that at the maximum load under monotonic loading.
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