Abstract
An experimental study for determining δ i , and J i , in three-point bend specimens with both shallow and deep notches has been described. A new method for obtaining δ i is simply introduced. Two clip gauges were used, P- V and P- Δ plots were simultaneously obtained on the same specimen. COD values were obtained from both P- V and P- Δ plots. Experimental results of three different heat-treated alloy steels show that the crack opening displacement and J-integral values of shallow cracks at initiation are much larger than those of deep cracks. The relationship of COD and J-integral is also studied.
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