Abstract
The dynamic tear (DT) test was developed for characterization of the fracture resistance properties of metals over the entire range of strength and toughness. The fracture extension resistance curve (R-curve), which is determined by DT test procedures, indicates the fracture state (elastic or plastic) and the level of resistance to crack extension in terms of the required energy per unit extension. R-curves were determined for four aluminum alloys in 3-in.-thick section. These materials had been tested by standard fracture mechanics procedures. R-curves for full thickness and for 1 and 0.625-in. section sizes are compared to results of KIc tests. The R-curve data are also presented in terms of an equation involving specimen cross-section dimensions and a constant which is related to R-curve slope.
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