The present paper deals with a modified tension test with experimental results for SAE 1020, SAE 1215, and OFHC Cu of standard 12.8 mm (0.505 in.) dia test bars. The tension test was interrupted at predetermined intervals in order to remove excess material from the gage sections after necking had commenced, or to subject the gage sections to a drawing operation in order to keep the difference between the neck diameters and the gage section diameter as small as possible for the purpose of reducing the triaxiality of the stresses in the necked region. The tests showed that the triaxiality could be reduced for SAE 1215 and OFHC Cu by machining the gage section. However, as expected and shown for one series of tests with ETPC Cu, the drawing operations were more effective because of work hardening of the gage sections.

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