Abstract
Several modifications of the upsetting test at room temperature are discussed under the aspect of suppressing friction and other possible sources of error.In the upsetting test according to Rastegaev, friction is reduced, and the test-piece remains cylindrical up to high strains, however the specimen’s height is determined with a large error. Therefore it is proposed to measure the increase of the specimen’s diameter instead of the reduction of height.Upsetting under sticking friction conditions can formally be treated like upsetting with lubrication for calculating the stress-strain curve. However, the applicability and the limits of this method have not yet been studied sufficiently.In the plane-strain upsetting test, friction is not suppressed completely, but the error of height measurement propagates only weakly into the calculated stress-strain curve.Key wordsUpsetting teststress-strain curvefriction suppression
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