A study was undertaken to determine the response of disc bend test data to variations in the relative size of the spherical penetrator, receiver hole and specimen thickness. Four materials - annealed and cold-worked copper and austenitic stainless steel — were lapped to three thicknesses, 0.1–0.25 mm. Specimens from each material were tested in a disc bend apparatus in which the penetrator diameter could be varied from 1 to 1.6 mm and the receiver hole diameter from 1.3 to 1.9 mm. Uniaxial tensile tests on each material were also conducted. It was found that load displacement data were most sensitive to thickness; “yield” load, maximum load and penetrator displacement to failure all increased to the greatest extent with increasing specimen thickness. Good correlations between these values and uniaxial tensile properties were found for all combinations of ball, hole and specimen size; but the data scatter was slightly reduced for the thickest specimens and the largest ball size.
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