Abstract
The effect of the ratio a/W on the values of δ i , and i in a structural steel has been studied by measuring the crack opening displacement and J- integral at initiation of crack growth in three-point bend specimens with shallow and deep notches and by three-dimensional finite element method analysis. By studying the results of the experiment and finite element analysis, we conclude that the different plastic deformation pattern and the larger plastic work needed for shallow notches is the most significant factor in determining the difference in behaviour between shallow and deep notches.
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